How to check and replace a malfunctioning thermostat?

If you suspect a faulty thermostat, test it out before you replace it. To test, submerge it in water heated to its rated temperature (typically 195°F). The valve should fully open at this temperature. As the water cools to about 10 degrees below this (around 185°F), the valve should close completely.

How to remove and install the thermostat housing and Thermostat for Pontiac Fiero?

The thermostat housing is on the upper end of both the 2.5L four-cylinder and 2.8L V6 engines. To remove, twist the thermostat housing cap clockwise, then pull out the thermostat. Clean the housing and lubricate the O-ring with white grease. If replacing the housing or gasket, disconnect the radiator hose (expect some coolant spillage). Disconnect the coolant temperature sensor wire. If replacing the housing, remove the sensor with caution. Remove old gasket residue from the cylinder head. Check the housing for external damage or internal corrosion. Apply RTV sealant to the new gasket and position it. Install the housing, tightening bolts securely. Wrap the sensor threads with Teflon tape, reattach it, and reconnect its wire. Refill with coolant, install the thermostat and its cap. Start the engine and check for leaks.

Genuine Pontiac Fiero Thermostat

Engine Coolant Thermostat

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Pontiac Fiero Thermostat,Engine Coolant
Part Number: 10192505
$5.33 MSRP: $17.42
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Product Specifications
- Other Name: THERMOSTAT, Engine Coolant Temperature; Thermostat
- Replaces: 03059793, 3059793
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1984-1988 Pontiac Fiero | 2 DOOR, GT 2 DOOR, SE 2 DOOR, SPORT 2 DOOR | 4 Cyl 2.5L, 6 Cyl 2.8L
View related parts
Pontiac Fiero Thermostat Asm,Engine Coolant
Part Number: 3059909
Product Specifications
- Other Name: THERMOSTAT, Engine Coolant Temperature; Thermostat
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1984-1987 Pontiac Fiero | 2 DOOR, GT 2 DOOR, SE 2 DOOR, SPORT 2 DOOR | 4 Cyl 2.5L
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Pontiac Fiero Housing & Flange Asm
Part Number: 10038440
Product Specifications
- Other Name: HOUSING, Engine Coolant Thermostat; Thermostat Housing
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1984-1988 Pontiac Fiero | 2 DOOR, GT 2 DOOR, SE 2 DOOR, SPORT 2 DOOR | 4 Cyl 2.5L

Pontiac Fiero Thermostat

The Thermostat holds perhaps one of the most essential subsystems in the Pontiac Fiero as it is responsible for controlling the temperature of the engine. Sitting usually adjacent to the radiator as a closed loop control it assists in maintaining the precise range of temperature for the engine. This is done through turning on or off the heating or cooling gadgets or by controlling the circulation of heat transfer fluids. During the years of Pontiac Fiero's production, various types of thermostats have been installed, mechanical including bimetallic strips and wax pellets and pneumatic including air filled control tubes. Such innovations in thermostat have really gone a long way inincreasing temperature and climatic control in the automotive industry and this has boost up the comfort together with efficiency.

Each OEM Pontiac Fiero Thermostat we offer is competitively priced and comes with the assurance of the manufacturer's warranty for the part. Furthermore, we guarantee the speedy delivery of your orders right to your doorstep. Our hassle-free return policy is also in place for your peace of mind.

Pontiac Fiero Thermostat Parts Questions & Experts Answers

Thermostat Asm,Engine Coolant
3059909
Q: How to check and replace a malfunctioning thermostat?
A: If you suspect a faulty thermostat, test it out before you replace it. To test, submerge it in water heated to its rated temperature (typically 195°F). The valve should fully open at this temperature. As the water cools to about 10 degrees below this (around 185°F), the valve should close completely.
Thermostat,Engine Coolant
10192505
Q: How to remove and install the thermostat housing and Thermostat for Pontiac Fiero?
A: The thermostat housing is on the upper end of both the 2.5L four-cylinder and 2.8L V6 engines. To remove, twist the thermostat housing cap clockwise, then pull out the thermostat. Clean the housing and lubricate the O-ring with white grease. If replacing the housing or gasket, disconnect the radiator hose (expect some coolant spillage). Disconnect the coolant temperature sensor wire. If replacing the housing, remove the sensor with caution. Remove old gasket residue from the cylinder head. Check the housing for external damage or internal corrosion. Apply RTV sealant to the new gasket and position it. Install the housing, tightening bolts securely. Wrap the sensor threads with Teflon tape, reattach it, and reconnect its wire. Refill with coolant, install the thermostat and its cap. Start the engine and check for leaks.