COOLING SYSTEM
Upgrade your Duramax cooling system with our wide selection of high-quality parts and components. From radiator fans to hose kits, we have everything you need to keep your engine running cool and performing at its best.
Cooling system upgrades are essential for maintaining engine health, especially for LMM or LLY models. Improve your vehicle's performance by investing in a Duramax radiator replacement or an electric fan conversion kit. Our aftermarket cooling parts like upper radiator hoses and coolant solutions are designed to help your engine run cooler and last longer.
At CPP Diesel, we pride ourselves on carrying top brands like Derale and Mishimoto to ensure that you're getting the best quality parts for your Duramax engine. With our fast shipping and exceptional customer service, you can trust us to provide you with the products you need to enhance your cooling system.
Don't let your engine overheat - shop our selection of Duramax electric fans, radiators, and other essential cooling system parts today. If you have any questions or can't find what you're looking for, feel free to reach out to us. Order your Duramax cooling system parts from CPP Diesel and keep your engine running cool.
Cooling system upgrades are essential for maintaining engine health, especially for LMM or LLY models. Improve your vehicle's performance by investing in a Duramax radiator replacement or an electric fan conversion kit. Our aftermarket cooling parts like upper radiator hoses and coolant solutions are designed to help your engine run cooler and last longer.
At CPP Diesel, we pride ourselves on carrying top brands like Derale and Mishimoto to ensure that you're getting the best quality parts for your Duramax engine. With our fast shipping and exceptional customer service, you can trust us to provide you with the products you need to enhance your cooling system.
Don't let your engine overheat - shop our selection of Duramax electric fans, radiators, and other essential cooling system parts today. If you have any questions or can't find what you're looking for, feel free to reach out to us. Order your Duramax cooling system parts from CPP Diesel and keep your engine running cool.
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MAHLE C33756 COOLANT PIPE O-RING FOR 2017-2020 GM 6.6L DURAMAX ENGINE
MAHLE
$4.55AutoCare brands Id FLHQ AutoCare brand MAHLE Environmentally hazardous material No The MAHLE C33756 Coolant Pipe O-Ring is a crucial component designed specifically for the 2017-2020 GM 6.6L Duramax L5P engines. This high-quality O-ring plays a...$4.55 -
FLEECE FPE-HAR-DMAX-FAN-LML DURAMAX FAN EXTENSION HARNESS (LML)
FLEECE PERFORMANCE
$63.65Our replacement fan extension harness for the 2011-2016 LML Duramax allows you to repair a broken or damaged harness without needing to replace the entire fan assembly. This harness is mounted to the fan assembly and connects to the fan and chassis...$63.65 -
FLEECE FPE-HAR-DMAX-FAN-L5P DURAMAX FAN EXTENSION HARNESS (L5P)
FLEECE PERFORMANCE
$63.65Our replacement fan extension harness for the 2017-2019 L5P Duramax allows you to repair a broken or damaged harness without needing to replace the entire fan assembly. This harness is mounted to the fan assembly and connects to the fan and chassis...$63.65 -
MAHLE GS33752 WATER PUMP GASKET KIT FOR 2001-2010 GM 6.6L DURAMAX ENGINE
MAHLE
$30.17Type a description for this product here...The MAHLE GS33752 Water Pump Gasket Kit is specifically designed for GM 6.6L Duramax engines, covering the LB7, LLY, LBZ, and LMM models manufactured between 2001 and 2010. This high-quality gasket kit is an...$30.17 -
MAHLE C31900 COOLANT THERMOSTAT HOUSING GASKET FOR 2001-2016 GM 6.6L DURAMAX ENGINE
MAHLE
$10.30Item Grade OEM Standard Additional Package Contents None Gasket Material Steel The MAHLE C31900 Coolant Thermostat Housing Gasket is an essential component for maintaining optimal performance in your GM 6.6L Duramax engine, covering the LB7, LLY,...$10.30 -
BOSTECH WP01100 WATER PUMP 2001-2005 GM 6.6L DURAMAX LB7/LLY
BOSTECH FUEL
$145.26Bostech's line of new heavy-duty water pumps are backed by our 24-month unlimited mileage warranty. We offer 50 plus skus covering most diesel engine applications. Our pumps are quality engineered according to the OEM's design and assembled with...$145.26 -
BOSTECH WP01101 WATER PUMP 2006-2010 GM 6.6L DURAMAX LBZ/LMM
BOSTECH FUEL
$166.02Bostech's line of new heavy-duty water pumps are backed by our 24-month unlimited mileage warranty. We offer 50 plus skus covering most diesel engine applications. Our pumps are quality engineered according to the OEM's design and assembled with...$166.02 -
BOSTECH BTS011012 COOLANT TEMPERATURE SENSOR 2001-2009 GM 6.6L DURAMAX LB7/LLY/LBZ/LMM | 1995-2000 GM 6.5L DIESEL
BOSTECH FUEL
$26.09Engine Coolant Temperature Sensor Brand: BT Power Condition: New Limited 24-Month Unlimited mileage warranty Wiring Pigtail Included Engine Fitment: Various General Motors The BOSTECH BTS011012 Coolant Temperature Sensor is designed to...$26.09 -
PPE 119020010 EGR TO CAB COOLANT HOSE FOR 01-10 GM 6.6L DURAMAX LB7/LLY/LBZ
PACIFIC PERFORMANCE ENGINEERING
$16.18Designed FOR factory fit, these durable 5mm performance silicone hoses are a perfect upgrade when your worn coolant hoses need replacing.Features: 1-ply heat-resistant internal fibers Durable, 5 mm thick silicone O.D. size: 24mm (15/16”) Best...$16.18 -
PPE 119020011 ENGINE TO CAB COOLANT HOSE FOR 11-16 GM DURAMAX 6.6L LML
PACIFIC PERFORMANCE ENGINEERING
$14.93Designed for factory fit, these durable 5mm performance silicone hoses are a perfect upgrade when your worn coolant hoses need replacing. GM Equivalent P/N: 20984280 Use with 119020009 1999-2016 GM Stainless Steel Heater Hose Connector...$14.93 -
PPE 119021004 EGR TO CAB COOLANT HOSE (CA) FOR 02 GM DURAMAX 6.6L LB7
PACIFIC PERFORMANCE ENGINEERING
$14.93Designed FOR factory fit, these durable 5mm performance silicone hoses are a perfect upgrade when your worn coolant hoses need replacing.Features: Silicone EGR to Cab Coolant Hose - Black 1-ply heat-resistant internal fibers Durable, 5mm thick silicone...$14.93 -
PPE 119021007 EGR TO CAB COOLANT HOSE FOR 04.5-10 GM 6.6L DURAMAX LLY/LBZ/LMM
PACIFIC PERFORMANCE ENGINEERING
$16.80Designed FOR factory fit, these durable 5mm performance silicone hoses are a perfect upgrade when your worn coolant hoses need replacing. Inner diameter of hose is 5/8 in GM Equivalent P/N: 97333410 Use with 119020009 1999-2016 GM...$16.80 -
PPE 119021010 EGR TO CAB COOLANT HOSE FOR 07.5-10 DURAMAX 6.6L LMM
PACIFIC PERFORMANCE ENGINEERING
$21.16Designed FOR factory fit, these durable 5mm performance silicone hoses are a perfect upgrade when your worn coolant hoses need replacing.Features: Silicone EGR to Cab Coolant Hose 1-ply heat-resistant internal fibers Durable, 5mm thick silicone Sold...$21.16 -
PPE 119021011 EGR TO CAB COOLANT HOSE FOR 11-16 GM DURAMAX 6.6L LML
PACIFIC PERFORMANCE ENGINEERING
$16.12Designed for factory fit, these durable 5mm performance silicone hoses are a perfect upgrade when your worn coolant hoses need replacing. GM Equivalent P/N: 12639068 Use with 119020009 1999-2016 GM Stainless Steel Heater Hose Connector. Features:...$16.12 -
PPE 116454080 HOSE KIT FOR COOLANT TANK UNIVERSAL
PACIFIC PERFORMANCE ENGINEERING
$74.73The PPE Coolant Overflow Tank Hose Kit to complements your overflow tank install.Features: Hose Kit FOR Coolant Overflow 3/8 Inch NPT to 1/2 Inch Brass Hose Barb 3/4 Inch NPT to 1 Inch Brass Hose Barb Includes Hoses Easy installation Sold As A Kit The...$74.73 -
PPE 119000530 THERMOSTAT HOUSING COVER RAW FOR 01-04 GM DURAMAX 6.6L LB7
PACIFIC PERFORMANCE ENGINEERING
$149.47Rust is the enemy of your coolant system. Upgrade your rusty OEM thermostat housing cover with a Cast 304 Stainless Steel Thermostat Housing Cover from PPE. This direct bolt-on replacement adds style and function to your engine bay. The stainless steel...$149.47 -
PPE 119000533 THERMOSTAT HOUSING COVER POLISHED FOR 01-04 GM DURAMAX 6.6L LB7
PACIFIC PERFORMANCE ENGINEERING
$149.47Rust is the enemy of your coolant system. Upgrade your rusty OEM thermostat housing cover with a Cast 304 Stainless Steel Thermostat Housing Cover from PPE. This direct bolt-on replacement adds style and function to your engine bay. The stainless steel...$149.47 -
PPE 119000540 THERMOSTAT HOUSING COVER RAW FOR 04-10 GM 6.6L DURAMAX LLY/LMM
PACIFIC PERFORMANCE ENGINEERING
$149.47Rust is the enemy of your coolant system. Upgrade your rusty OEM thermostat housing cover with a Cast 304 Stainless Steel Thermostat Housing Cover from PPE. This direct bolt-on replacement adds style and function to your engine bay. The stainless steel...$149.47 -
PPE 119000543 THERMOSTAT HOUSING COVER LLY LBZ LMM - POLISHED FOR 04-10 GM 6.6L DURAMAX LLY/LBZ/LMM
PACIFIC PERFORMANCE ENGINEERING
$149.47Rust is the enemy of your coolant system. Upgrade your rusty OEM thermostat housing cover with a Cast 304 Stainless Steel Thermostat Housing Cover from PPE. This direct bolt-on replacement adds style and function to your engine bay. The stainless steel...$149.47 -
PPE 119000630 COOLANT BYPASS TUBE - WATER PUMP TO THERMOSTAT HOUSING FOR 01-10 GM 6.6L DURAMAX LB7/LLY/LBZ
PACIFIC PERFORMANCE ENGINEERING
$161.93Features: Fully-polished 304 stainless steel CNC machined tube end Comes with two Viton O-rings VEHICLE FITMENT: 2005 GMC Sierra 3500HD 8 Cyl 6.6 Liter Turbo 2005 GMC Sierra 2500HD 8 Cyl 6.6 Liter Turbo 2005 Chevrolet Silverado 3500HD 8...$161.93 -
PPE 119000730 COOLANT BYPASS TUBE - WATER PUMP TO THERMOSTAT HOUSING FOR 01-10 GM 6.6L DURAMAX LB7/LLY/LBZ
PACIFIC PERFORMANCE ENGINEERING
$161.93Specifically designed FOR use with the factory water pump. Fully polished 304 stainless steel construction looks great and prevents corrosion. The OEM mild steel pipe rusts and eventually leaks. Features: Fully-polished 304 stainless steel CNC...$161.93 -
PPE 119000820 COOLANT BLOCK-OFF PLATE - BILLET ALUMINUM - BLACK FOR 01-20 GM 6.6L DURAMAX LB7/LLY/LBZ/LMM/LML/L5P
PACIFIC PERFORMANCE ENGINEERING
$74.73The OEM block off plate uses a gasket and can leak over time. The PPE billet block off plate is thicker and uses an O-ring seal. The O-ring is made from Viton more maximum longevity. The PPE billet block off plate installs using the OEM fasteners. PART...$74.73 -
PPE 119001000 ENGINE COOLANT RETURN PIPE-304SS RAW FOR 01-04 GM DURAMAX 6.6L LB7
PACIFIC PERFORMANCE ENGINEERING
$124.56Specifically designed FOR use in conjunction with the factory thermostat housing. 304 stainless steel construction prevents corrosion compared with OEM mild steel pipe which is prone to rusting and eventually leaking. Allows FOR installation of factory...$124.56 -
PPE 119001030 ENGINE COOLANT RETURN PIPE-304SS POLISHED FOR 01-04 GM DURAMAX 6.6L LB7
PACIFIC PERFORMANCE ENGINEERING
$137.01Specifically designed FOR use in conjunction with the factory thermostat housing. 304 stainless steel construction prevents corrosion compared with OEM mild steel pipe which is prone to rusting and eventually leaking. Allows FOR installation of factory...$137.01 -
PPE 119001100 ENGINE COOLANT RETURN PIPE-304SS RAW FOR 04-05 GM DURAMAX 6.6L LLY
PACIFIC PERFORMANCE ENGINEERING
$124.56Specifically designed FOR use in conjunction with the factory thermostat housing. 304 stainless steel construction prevents corrosion compared with OEM mild steel pipe which is prone to rusting and eventually leaking. Allows FOR installation of factory...$124.56 -
PPE 119001130 ENGINE COOLANT RETURN PIPE-304SS POLISHED FOR 04-05 GM DURAMAX 6.6L LLY
PACIFIC PERFORMANCE ENGINEERING
$137.01Specifically designed FOR use in conjunction with the factory thermostat housing. 304 stainless steel construction prevents corrosion compared with OEM mild steel pipe which is prone to rusting and eventually leaking. Allows FOR installation of factory...$137.01 -
PPE 119001200 ENGINE COOLANT RETURN PIPE 304SS RAW FOR 06-07 GM DURAMAX 6.6L LLY/LBZ
PACIFIC PERFORMANCE ENGINEERING
$124.56Specifically designed FOR use in conjunction with the factory thermostat housing. 304 stainless steel construction prevents corrosion compared with OEM mild steel pipe which is prone to rusting and eventually leaking. Allows FOR installation of factory...$124.56 -
PPE 119001230 ENGINE COOLANT RETURN PIPE-304SS POLISHED FOR 06-10 GM DURAMAX 6.6L LBZ/LMM
PACIFIC PERFORMANCE ENGINEERING
$137.01Specifically designed FOR use in conjunction with the factory thermostat housing. 304 stainless steel construction prevents corrosion compared with OEM mild steel pipe which is prone to rusting and eventually leaking. Allows FOR installation of factory...$137.01 -
PPE 119020009 HEATER HOSE CONNECTOR-STAINLESS STEEL FOR 01-16 GM 6.6L DURAMAX LB7/LLY/LBZ/LMM/LML
PACIFIC PERFORMANCE ENGINEERING
$31.13The plastic HVAC heater hose connectors are a common failure point when the older part fatigues from heat and vibration. This PPE Stainless Steel Heater Hose Connector will provide excellent durability and corrosion resistance for the life of your...$31.13 -
WEHRLI WCF100622 | 2006-2010 LBZ/LMM DURAMAX UPPER COOLANT PIPE
WEHRLI CUSTOM FABRICATION
$181.25The WEHRLI WCF100622 Upper Coolant Pipe is the perfect upgrade for your 2006-2010 LBZ/LMM 6.6L Duramax-equipped Chevrolet Silverado or GMC Sierra 2500/3500 HD truck. This aluminum coolant pipe is designed to replace the OEM rubber upper coolant hose,...$181.25 -
CPP DIESEL UNIVERSAL 10IN ELECTRIC 1750 CFM COOLING FAN KIT
CPP DIESEL
$124.50Enhance your vehicle's cooling system with the CPP Diesel 10-inch Electric Cooling Fan Kit, delivering a powerful and efficient solution for maintaining optimal engine temperatures. This versatile 80-watt fan is designed as a default "pusher" fan,...$124.50 -
CPP RADIATOR DRAIN PIPE FOR 06-19 GM 2500/3500HD WITH DURAMAX ENGINE
CPP DIESEL
$82.98Inline Radiator Hose Drain Designed for applications where the radiator does not have a drain valve Splices into the lower radiator hose allowing for easy access to drain your coolant Specifications: 1.5 inches od, 1.25 inches id, 3 inches long, 1/4...$82.98 -
WEHRLI WCF100472 2001+ CHEVROLET DURAMAX/13-18 6.7L DODGE CUMMINS BILLET ALUMINUM COOLANT TANK CAP - CLEAR
WEHRLI CUSTOM FABRICATION
$49.6118-20PSI Replacement Coolant Tank Cap, Clear Anodized. Used on WCFab Fabricated Coolant Tanks on 2001-2024 Duramax or 2004.5-2007 & 2010-2024 6.7L Cummins. - Replacement Cap for WCFab Coolant Tank- Clear Anodized Finish The WEHRLI WCF100472...$49.61 -
WEHRLI WCF100541 2020-2024 L5P DURAMAX UPPER COOLANT PIPE KIT
WEHRLI CUSTOM FABRICATION
$248.07Upper Coolant Pipe for 2020-2025 L5P 6.6L Duramax equipped Chevrolet Silverado or GMC Sierra 2500 / 3500 truck replaces the ugly OEM rubber upper radiator hose with a fabricated aluminum hard pipe powder coated in your color of choice! For use with...$248.07 -
WEHRLI WCF100860 2001-2005 LB7 / LLY DURAMAX UPPER COOLANT PIPE
WEHRLI CUSTOM FABRICATION
$181.25High Flow Intake Bundle Package for 2003-2007 5.9L Cummins. Saves $50.00 vs buying all components individually! This Kit Includes: WCF100544 - 3" Passenger Side Intercooler Pipe WCF100528 - 3.5" Driver Side Intercooler Pipe and Intake Horn...$181.25 -
WEHRLI WCF100742 2017-2019 L5P DURAMAX UPPER COOLANT PIPE KIT
WEHRLI CUSTOM FABRICATION
$200.04Aluminum Upper Coolant Pipe for 2017-2019 L5P Duramax replaces the OEM rubber upper coolant hose and comes powder coated color of choice! For use with OEM GM radiator. Aftermarket radiators may cause fitment issues. Replaces the following GM Part...$200.04 -
WEHRLI WCF100696 2011-2016 LML DURAMAX UPPER COOLANT PIPE
WEHRLI CUSTOM FABRICATION
$200.04Aluminum Upper Coolant Pipe for 2011-2016 LML Duramax replaces the OEM rubber upper coolant hose and comes powder coated color of choice! For use with OEM GM radiator! Some aftermarket radiators may cause fitment issues! Replaces the following GM Part...$200.04 -
PPE 119020086 1.75" COOLANT DRAIN TUBE SS W/1/4"NPT BUNG UNIVERSAL
PACIFIC PERFORMANCE ENGINEERING
$37.36Coolant Drain Tube - 1.75” - 304 Stainless Steel Now easily drain your cooling system with this painless upgrade. This quick install can be done right in your driveway and adds a service option to any vehicle that doesn't come with a factory...$37.36 -
PPE 119000100 COOLANT BLOCK OFF PLUG FOR 07.5-10 GM 6.6L DURAMAX LMM
PACIFIC PERFORMANCE ENGINEERING
$49.81Coolant Block-Off Plug Duramax (LMM) Coolant Block-Off Plug by PPE®. Finish: Undefined. PPE is where engineering, design, and quality come together in perfect FORm. This superior product was crafted using modern manufacturing methods and high-grade...$49.81 -
PPE 116002060 LARGE DIAMETER (12.7MM) TURBO COOLANT HOSE FOR 06-10 GM DURAMAX 6.6L LBZ/LMM
PACIFIC PERFORMANCE ENGINEERING
$12.44Time and under hood temperatures make the factory turbo coolant hose material brittle. Plus, if you replace your turbo or remove this small coolant hose, the factory rubber typically de FORms or tears.The PPE Turbo Coolant Hose performance Silicone Hose...$12.44 -
PPE 114001050 COOLANT TUBE KIT FOR INTERNAL OIL COOLER DELETE FOR 01-16 GM 6.6L DURAMAX LB7/LLY/LBZ/LMM/LML
PACIFIC PERFORMANCE ENGINEERING
$249.12The PPE 114001050 Coolant Tube Kit is a precision-engineered solution designed to complement the PPE Internal Oil Cooler Delete Kit FOR FOR 01-16 GM 6.6L Duramax LB7/LLY/LBZ/LMM/LML engines. Crafted from high-quality 304 stainless steel, this kit ensures...$249.12 -
PPE 116002045 SMALL DIAMETER (10 MM) TURBO COOLANT HOSE FOR 01-05 GM DURAMAX 6.6L LB7/LLY
PACIFIC PERFORMANCE ENGINEERING
$12.44Turbo Coolant Hose Small Diameter 10mm LB7 LLY Time and under hood temperatures make the factory turbo coolant hose material brittle. Plus, if you replace your turbo or remove this small coolant hose, the factory rubber typically de FORms or tears.The...$12.44 -
PPE 116111810 COOLANT TUBE OEM CUT AND WELD FOR 07.5-10 DURAMAX 6.6L LMM
PACIFIC PERFORMANCE ENGINEERING
$249.12PPEs modified coolant tube FOR LMM Duramax 6.6L is designed FOR use with PPE Up-pipes and Manifolds. Our experts cut, reposition and weld the coolant tube FOR proper clearance. The coolant that flows through the tube provides heat to the heater...$249.12 -
MISHIMOTO MMTS-CHV-01DL LOW TEMPERATURE THERMOSTATS (SET OF 2) 2001-2016 GM DURAMAX 6.6L
MISHIMOTO
$121.73The Mishimoto MMTS-CHV-01DL Low Temperature Thermostats are the ideal cooling solution for Chevrolet/GMC Duramax 6.6L engines from 2001 to 2016. Engineered to activate at a lower temperature compared to OEM thermostats, this set of two thermostats...$121.73 -
MISHIMOTO MMTS-CHV-01DH HIGH TEMPERATURE THERMOSTATS (SET OF 2) 2001-2016 GM DURAMAX 6.6L
MISHIMOTO
$118.96The Mishimoto MMTS-CHV-01DH High Temperature Thermostats (Set of 2) for 2001-2016 GM Duramax 6.6L engines are engineered to optimize the performance of your Chevrolet or GMC Duramax truck. These high-temperature thermostats are designed to activate at a...$118.96 -
MISHIMOTO MMFAN-MOUNT Electric Fan Mounting Kit
MISHIMOTO
$19.31The Mishimoto MMFAN-MOUNT Electric Fan Mounting Kit offers a versatile solution for securely mounting a Mishimoto electric fan to any Mishimoto aluminum radiator. Specifically designed for custom applications, this universal fan mount kit provides the...$19.31 -
FLEECE FPE-DMAX-CBOP DURAMAX BILLET COOLANT BLOCK OFF PLATE 2001-2017
FLEECE PERFORMANCE
$76.132001-2016 Duramax Billet Coolant Block Off Plate (Replaces GM P/N: 97941204) OE covers are prone to leakage as the gaskets dry out and factory cast covers corrode. Our billet coolant block off plate with an integral O-ring is an upgrade for your rear...$76.13 -
FLEECE FPE-LML-CP DURAMAX LML REAR ENGINE COVER COOLANT RETURN PLUG
FLEECE PERFORMANCE
$27.67Whether you're putting on an aftermarket turbo or deleting the EGR system on your LML, this coolant return plug will help you put the finishing touches on the job. The plug is made from high quality 6061 aluminum, anodized black, and laser etched with...$27.67 -
FLEECE FPE-TURBO-THERM DURAMAX TURBO THERMOSTAT DELETE PLUG
FLEECE PERFORMANCE
$52.53The Fleece Performance Duramax Turbo Thermostat Delete Plug is designed to eliminate the stock coolant feed line when installing a non-water cooled turbocharger on your Duramax. It provides clearance for larger intake plumbing, is CNC machined from...$52.53