How to diagnose and replace a faulty thermostat on Mercury Grand Marquis?

You should check the coolant level, drive belt tension, and temperature gauge (or light) operation before diagnosing a faulty thermostat. If your engine takes too long to warm up, this means there is a stuck open thermostat that has to be replaced. When an upper radiator hose remains cool while the engine runs hot then it is very likely that its thermostat is stuck closed hence it needs replacement. When you feel a hot upper radiator hose it means that the thermostat is open so you need to find out the reasons behind the engine heat-up. Overheating results in serious problems such as head gasket leaks, scuffed pistons as well as warped or cracked cylinder heads. You should drain the coolant, remove the distributor cap (if necessary), disconnect hoses, remove the housing cover, extract the old thermostat, clean surfaces, apply sealant or insert O-ring seal, install a new thermostat, attach cover, tighten bolts, reconnect hoses (if they have been disconnected), refill coolant and check for leaks when replacing the thermostat.

Genuine Mercury Grand Marquis Thermostat

Engine Coolant Thermostat

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3 Thermostats found

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Mercury Grand Marquis Thermostat Assembly
Part Number: 3L3Z-8575-AC
$17.17 MSRP: $30.91
You Save: $13.74 (45%)
ADD TO CART
Product Specifications
- Other Name: Thermostat Assy
- Replaced by: 7L3Z-8575-E
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2007-2011 Mercury Grand Marquis | 8 Cyl 4.6L Romeo SOHC EFI | 4-Speed Automatic Transmission 4R75E Livonia, Left Hand Drive, Rear-Wheel Drive (Left Hand Drive)
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Mercury Grand Marquis Thermostat Assembly
Part Number: F5OY-8575-A
$12.65 MSRP: $20.00
You Save: $7.35 (37%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Thermostat Assy; Thermostat
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 2003-2006 Mercury Grand Marquis | 8 Cyl 4.6L | 4AT 4R70W
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Mercury Grand Marquis Thermostat Assembly
Part Number: F5DZ-8575-A
$9.90 MSRP: $15.38
You Save: $5.48 (36%)
ADD TO CART
Product Specifications
- Other Name: Thermostat Assy
- Replaced by: YF1Z-8575-BA
- Warranty: This genuine part is guaranteed by Ford's factory warranty.
Fits the following Vehicles:
- 1980-1983 Mercury Grand Marquis | 8 Cyl 4.2L, 8 Cyl 5.0L, 8 Cyl 5.8L | 3AT, 3AT C4, 3AT C6, 4AT AOD

Mercury Grand Marquis Thermostat

The Thermostat is a vital component in the car because it controls the temperature of the engine in a Mercury Grand Marquis to its efficient levels. Found mainly near the radiator this closed loop control makes it easy to regulate the desired temperature range. For the years, various thermostat types have been employed including; Mechanical thermostat such as the bimetallic strip and wax pellets and pneumatic thermostat employing air filled control tubes. These are thermostats that turn on or off heating or cooling devices to effectively control temperature. The common types of thermostats include an analog type, digital non-programmable, and digital programmable type, and each of them brings something different to the table when it comes to regulation of temperature within a car.

We provide a wide range of Mercury Grand Marquis Thermostat at the best prices possible. If you need Mercury Grand Marquis Thermostat, you can shop with confidence on our website. All our OEM parts come with a manufacturer's warranty and are delivered to your door step with a fast delivery service.

Mercury Grand Marquis Thermostat Parts Questions & Experts Answers

Thermostat Assembly
F5OY-8575-A
Q: How to diagnose and replace a faulty thermostat on Mercury Grand Marquis?
A: You should check the coolant level, drive belt tension, and temperature gauge (or light) operation before diagnosing a faulty thermostat. If your engine takes too long to warm up, this means there is a stuck open thermostat that has to be replaced. When an upper radiator hose remains cool while the engine runs hot then it is very likely that its thermostat is stuck closed hence it needs replacement. When you feel a hot upper radiator hose it means that the thermostat is open so you need to find out the reasons behind the engine heat-up. Overheating results in serious problems such as head gasket leaks, scuffed pistons as well as warped or cracked cylinder heads. You should drain the coolant, remove the distributor cap (if necessary), disconnect hoses, remove the housing cover, extract the old thermostat, clean surfaces, apply sealant or insert O-ring seal, install a new thermostat, attach cover, tighten bolts, reconnect hoses (if they have been disconnected), refill coolant and check for leaks when replacing the thermostat.