How to replace the engine coolant thermostat on a 4.2L engine on Chevrolet Trailblazer?

Start your engine coolant Thermostat replacement project on a 4.2l engine by obtaining these basic tools: hose clamp pliers (J 38185). Hose clamp pliers (J 38185). Start your process by draining coolant from the Radiator. Next, remove the generator. First remove the outlet hose clamp from the Thermostat Housing before you disconnect the outlet hose. Next remove the Thermostat Housing bolts before extracting the Thermostat Housing from its position on the engine block. First wipe down everything inside the Thermostat Housing before cleaning the contacting area where the engine block meets the housing. Position the Thermostat Housing on the engine block before screwing in Thermostat Housing bolts until they reach 10 n.m (89 lb in). The Radiator Hose's inner diameter needs lubrication with engine coolant before re-attaching the outlet hose to the Thermostat Housing through its clamp installation. Replace the generator then fill the cooling system according to coolant specifications. After starting the engine the technician should inspect all areas with sealing surfaces for possible leaks.

OEM Chevrolet Trailblazer Thermostat

Engine Coolant Thermostat

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Chevrolet Trailblazer Thermostat
Part Number: 89018168
$39.67 MSRP: $78.71
You Save: $39.04 (50%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Engine Coolant Thermostat; Thermostat, Engine Coolant Temperature
- Replaces: 89017851
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2007-2009 Chevrolet Trailblazer | Base, LS, LT, SS | 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS
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Chevrolet Trailblazer Thermostat Housing
Part Number: 12620112
$56.23 MSRP: $115.56
You Save: $59.33 (52%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Housing, Engine Coolant Temperature; Thermostat Housing Cover; Housing, Engine Coolant Thermostat
- Replaces: 12567750, 12572988, 12602913
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2002-2009 Chevrolet Trailblazer | Base, LS, LT, LTZ, North Face, SS | 6 Cyl 4.2 L GAS, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS
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Chevrolet Trailblazer Thermostat Unit
Part Number: 12600171
$22.45 MSRP: $42.18
You Save: $19.73 (47%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Thermostat, Engine Coolant Temperature; Thermostat
- Replaces: 12581595
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2006-2008 Chevrolet Trailblazer | Base, LS, LT, SS | 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS
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Chevrolet Trailblazer Thermostat
Part Number: 55503988
$32.86 MSRP: $58.69
You Save: $25.83 (45%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermostat Assembly-Engine Coolant; Thermostat, Engine Coolant Temperature
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2021-2024 Chevrolet Trailblazer | L, LS, LT | 3 Cyl 1.2 L GAS

Chevrolet Trailblazer Thermostat

Our website offers an extensive catalog of genuine Chevrolet Trailblazer Thermostat at unbeatable prices. Every OEM Chevrolet Trailblazer Thermostat comes with a manufacturer's warranty, an easy return policy, and rapid delivery service. Don't miss out on this great opportunity!

Chevrolet Trailblazer Thermostat Parts Questions & Experts Answers

Thermostat Housing
12620112
Q: How to replace the engine coolant thermostat on a 4.2L engine on Chevrolet Trailblazer?
A: Start your engine coolant Thermostat replacement project on a 4.2l engine by obtaining these basic tools: hose clamp pliers (J 38185). Hose clamp pliers (J 38185). Start your process by draining coolant from the Radiator. Next, remove the generator. First remove the outlet hose clamp from the Thermostat Housing before you disconnect the outlet hose. Next remove the Thermostat Housing bolts before extracting the Thermostat Housing from its position on the engine block. First wipe down everything inside the Thermostat Housing before cleaning the contacting area where the engine block meets the housing. Position the Thermostat Housing on the engine block before screwing in Thermostat Housing bolts until they reach 10 n.m (89 lb in). The Radiator Hose's inner diameter needs lubrication with engine coolant before re-attaching the outlet hose to the Thermostat Housing through its clamp installation. Replace the generator then fill the cooling system according to coolant specifications. After starting the engine the technician should inspect all areas with sealing surfaces for possible leaks.