How to replace a thermostat in a cooling system for Chevrolet Trailblazer?

Before assuming the thermostat is to blame for a cooling system problem, it is important to check the coolant level, drive belt tension, and temperature gauge (or light) operation. Before starting the replacement process, it is important to disconnect the cable from the negative terminal of the battery and partially drain the cooling system, saving the coolant if it is in good condition. If the fitting that mates with the hose deteriorates, replace the thermostat housing. The thermostat housing can be removed by removing the bolts and tapping it with a soft-face hammer if it is stuck. The mating surfaces on the engine and the thermostat housing should be cleaned, and a new O-ring should be installed in the groove in the housing. The thermostat housing should then be reattached to the intake manifold or water pump housing, depending on the model, and the bolts should be tightened to the proper torque specifications. Finally, the cooling system should be refilled, the engine should be run, and carefully checked for leaks.

Genuine Chevrolet Trailblazer Thermostat

Engine Coolant Thermostat

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Chevrolet Trailblazer Thermostat Kit,Engine Coolant
Part Number: 89018168
$37.24 MSRP: $75.53
You Save: $38.29 (51%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: THERMOSTAT KIT, Engine Coolant Temperature; Thermostat
- Replaces: 89017851
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2007-2009 Chevrolet Trailblazer | 4 DOOR | 8 Cyl 5.3L, 8 Cyl 6.0L
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Chevrolet Trailblazer Thermostat,Engine Coolant
Part Number: 12600171
$21.44 MSRP: $40.48
You Save: $19.04 (48%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: THERMOSTAT, Engine Coolant Temperature; Thermostat, Thermostat Unit
- Replaces: 12581595
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2004-2006 Chevrolet Trailblazer | 4 DOOR, 4 DOOR EXT | 8 Cyl 5.3L, 8 Cyl 6.0L
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Chevrolet Trailblazer Housing Assembly, Engine Coolant Thermostat
Part Number: 12620112
$55.00 MSRP: $115.56
You Save: $60.56 (53%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: HOUSING, Engine Coolant Temperature; Thermostat Housing
- Replaces: 12602913, 12572988, 12567750
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2002-2009 Chevrolet Trailblazer | 4 DOOR, 4 DOOR EXT | 6 Cyl 4.2L
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Chevrolet Trailblazer Thermostat Assembly, Eng Cool
Part Number: 55503988
$32.71 MSRP: $58.69
You Save: $25.98 (45%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermostat
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2021 Chevrolet Trailblazer | 4 DOOR EXT | 3 Cyl 1.2L

About Chevy TrailBlazer Thermostat

Of all the high-precision auto parts within a GM car, the most important one is the Chevy TrailBlazer Thermostat. Keeping your TrailBlazer Thermostat in top condition is critical to keeping your vehicle running smoothly. By buying a new replacement part, you can save hundreds, even thousands of dollars in costly auto repairs later down the road.

Chevrolet Trailblazer Thermostat Parts Questions & Experts Answers

Thermostat,Engine Coolant
12600171
Q: How to replace a thermostat in a cooling system for Chevrolet Trailblazer?
A: Before assuming the thermostat is to blame for a cooling system problem, it is important to check the coolant level, drive belt tension, and temperature gauge (or light) operation. Before starting the replacement process, it is important to disconnect the cable from the negative terminal of the battery and partially drain the cooling system, saving the coolant if it is in good condition. If the fitting that mates with the hose deteriorates, replace the thermostat housing. The thermostat housing can be removed by removing the bolts and tapping it with a soft-face hammer if it is stuck. The mating surfaces on the engine and the thermostat housing should be cleaned, and a new O-ring should be installed in the groove in the housing. The thermostat housing should then be reattached to the intake manifold or water pump housing, depending on the model, and the bolts should be tightened to the proper torque specifications. Finally, the cooling system should be refilled, the engine should be run, and carefully checked for leaks.