How to replace the thermostat on GMC Envoy?

First remove all coolant from the Radiator before performing the Thermostat replacement. The hose clamp pliers (J 38185) will release the outlet hose clamp at the water inlet of the Thermostat before the outlet hose can be removed from its position. After you detach the water inlet bolts you can pull off the Thermostat Housing before removing it from the engine block. Wipe down both the Thermostat Housing and the engine block's sealing surface. Fit the Thermostat Housing to the engine block water inlet and tighten the bolts to 10 nm (89 inch lbs.). Place engine coolant inside the hose's inner diameter before attaching the outlet hose to the Thermostat with its clamp. After filling the cooling system with correct coolant solution, verify that all sealing areas remain leak-free when the engine starts.

OEM GMC Envoy Thermostat

Engine Coolant Thermostat

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GMC Envoy Thermostat Part Number: 89018168
$36.41 MSRP: $72.25
You Save: $35.84 (50%)
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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 GMC Envoy | Denali | 8 Cyl 5.3 L GAS
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GMC Envoy Thermostat Housing Part Number: 12620112
$57.36 MSRP: $117.88
You Save: $60.52 (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 GMC Envoy | Denali, SLE, SLT | 6 Cyl 4.2 L GAS, 8 Cyl 5.3 L GAS
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GMC Envoy Thermostat Unit Part Number: 12600171
$24.02 MSRP: $45.12
You Save: $21.10 (47%)
Ships in 1-2 Business Days
ADD TO CART
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:
- 2005-2009 GMC Envoy | Denali | 8 Cyl 5.3 L GAS

GMC Envoy Thermostat

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The GMC Envoy Thermostat is one of the auto cooling system parts and often located close to the radiator. Its main use is to control heat generated by the engine and allow the maximum performance. Thermostats are categorized as closed-loop control devices that are responsible for the sensing of a predetermined temperature setpoint purposely on the flow of heat transfer fluids. Some of the earlier types of thermostats used are mechanical thermostats such as the bimetallic strips, and wax pellets and other pneumatic thermostats which makes use of air-filled control tubes. These advancements have resulted into proper control of temperature in automotive system whose benefits are felt in terms of comfort as well as efficiency in GMC Envoy.

GMC Envoy Thermostat Parts and Q&A

Thermostat Housing
12620112
Q: How to replace the thermostat on GMC Envoy?
A:
First remove all coolant from the Radiator before performing the Thermostat replacement. The hose clamp pliers (J 38185) will release the outlet hose clamp at the water inlet of the Thermostat before the outlet hose can be removed from its position. After you detach the water inlet bolts you can pull off the Thermostat Housing before removing it from the engine block. Wipe down both the Thermostat Housing and the engine block's sealing surface. Fit the Thermostat Housing to the engine block water inlet and tighten the bolts to 10 nm (89 inch lbs.). Place engine coolant inside the hose's inner diameter before attaching the outlet hose to the Thermostat with its clamp. After filling the cooling system with correct coolant solution, verify that all sealing areas remain leak-free when the engine starts.