How to replace a thermostat in a cooling system?

Before assuming the thermostat is to blame for a cooling system problem, check coolant level, drivebelt tension and temperature gauge (or light) operation. If the engine takes a long time to warm up, the thermostat is probably stuck open. In this case, replace the thermostat. If the engine runs hot, use your hand to check the temperature of the upper radiator hose. If the hose is not hot, but the engine is, the thermostat is probably stuck in the closed position, preventing the coolant inside the engine from escaping to the radiator. Again, replace the thermostat. If the upper radiator hose is hot, it means that the coolant is flowing and the thermostat is open. To replace the thermostat, disconnect the negative battery cable, drain the cooling system, and remove the upper radiator hose from the thermostat housing. Remove the bolts from the thermostat housing and detach the housing. Be prepared for some coolant to spill as the gasket seal is broken. Remove the thermostat, noting the way it was installed. Remove all traces of gasket material from the sealing surfaces. Apply gasket sealer to both sides of a new gasket and position it on the engine. Install the thermostat (spring end first), housing and bolts. Tighten the bolts to the specified torque. Finally, refill the cooling system.

Genuine Chevrolet Nova Thermostat

Engine Coolant Thermostat

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Chevrolet Nova Housing,Engine Coolant Thermostat Lower
Part Number: 94840247
$33.81 MSRP: $40.92
You Save: $7.11 (18%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: HOUSING, Engine Coolant Thermostat; Thermostat Housing
- Position: Lower
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1985-1988 Chevrolet Nova | 4 DOOR, 4 DOOR NOTCHBACK, TWIN CAMSHAFT 4 DOOR | 4 Cyl 1.6L
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Chevrolet Nova Thermostat,Engine Coolant
Part Number: 94856516
$17.37 MSRP: $27.83
You Save: $10.46 (38%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: THERMOSTAT, Engine Coolant Temperature
- Replaces: 94844616
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1985-1988 Chevrolet Nova | 4 DOOR, 4 DOOR NOTCHBACK, TWIN CAMSHAFT 4 DOOR | 4 Cyl 1.6L
View related parts
Chevrolet Nova Thermostat,Engine Coolant
Part Number: 94859163
Product Specifications
- Other Name: THERMOSTAT, Engine Coolant Temperature
- Replaces: 94840251
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1985-1988 Chevrolet Nova | 4 DOOR, 4 DOOR NOTCHBACK, TWIN CAMSHAFT 4 DOOR | 4 Cyl 1.6L

Chevrolet Nova Thermostat

The Thermostat is a part of the cooling system of the Chevrolet Nova's and is usually located adjacent to the radiator. Its major task is to control the temperature of the engine, so that it stays within the optimal range for high performance. Thermostats are control instruments, which are typically utilised to sense the temperature and maintain a specific set point important in households or factories. There has been the use of different kinds of thermostats for a long time, mechanical thermostats being some of them such as the bimetallic strips and the wax pellets, pneumatic thermostats, which are composed of air-filled control tubes. These have contributed towards improved temperature regulation in vehicle's systems adding to comfort and effectiveness.

Each OEM Chevrolet Nova 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.

Chevrolet Nova Thermostat Parts Questions & Experts Answers

Thermostat,Engine Coolant
94856516
Q: How to replace a thermostat in a cooling system?
A: Before assuming the thermostat is to blame for a cooling system problem, check coolant level, drivebelt tension and temperature gauge (or light) operation. If the engine takes a long time to warm up, the thermostat is probably stuck open. In this case, replace the thermostat. If the engine runs hot, use your hand to check the temperature of the upper radiator hose. If the hose is not hot, but the engine is, the thermostat is probably stuck in the closed position, preventing the coolant inside the engine from escaping to the radiator. Again, replace the thermostat. If the upper radiator hose is hot, it means that the coolant is flowing and the thermostat is open. To replace the thermostat, disconnect the negative battery cable, drain the cooling system, and remove the upper radiator hose from the thermostat housing. Remove the bolts from the thermostat housing and detach the housing. Be prepared for some coolant to spill as the gasket seal is broken. Remove the thermostat, noting the way it was installed. Remove all traces of gasket material from the sealing surfaces. Apply gasket sealer to both sides of a new gasket and position it on the engine. Install the thermostat (spring end first), housing and bolts. Tighten the bolts to the specified torque. Finally, refill the cooling system.