How to remove and install the thermostat on Cadillac ElDorado and Fleetwood?

For 4.5L and 4.9L engines, drain coolant, and remove the upper air filter assembly. Next, unscrew the two bolts of the upper thermostat housing, then remove the thermostat. Install a new thermostat and O-ring, reattach the housing, and tighten the bolts. Refill the system, start the engine, and make sure there are no leaks.

Genuine Cadillac Eldorado Thermostat

Engine Coolant Thermostat

Enter your vehicle info to find more parts and verify fitment

Select Vehicle by VIN
Select Vehicle by Model

Select by VIN

Enter your VIN for the most accurate results.

Select by Model

-- Select Make --

-- Select Model --

-- Select Year --

9 Thermostats found

View related parts
Cadillac Eldorado Housing, Thermostat
Part Number: 1647540
- Other Name: HOUSING, Engine Coolant Thermostat; Thermostat Housing, Water Outlet
$11.14 MSRP: $21.01
You Save: $9.87 (47%)

Add to Cart
More Info
Fits the following Vehicles:
1993-2002 Cadillac Eldorado | COMMERCIAL CHASSIS, ELDORADO | 8 Cyl 4.6L
Less Info
View related parts
Cadillac Eldorado Thermostat,Engine Coolant
Part Number: 12559807
- Other Name: THERMOSTAT, Engine Coolant Temperature; Thermostat
- Replaces: 3531407, 12555811, 12554784
$35.87 MSRP: $85.42
You Save: $49.55 (59%)

Add to Cart
More Info
Fits the following Vehicles:
1993-2002 Cadillac Eldorado | COMMERCIAL CHASSIS, ELDORADO | 8 Cyl 4.6L
Less Info
View related parts
Cadillac Eldorado Thermostat,Engine Coolant
Part Number: 3539588
- Other Name: THERMOSTAT, Engine Coolant Temperature; Thermostat
$9.25 MSRP: $17.46
You Save: $8.21 (48%)

Add to Cart
More Info
Fits the following Vehicles:
1986-1993 Cadillac Eldorado | COMMERCIAL CHASSIS, ELDORADO | 8 Cyl 4.1L, 8 Cyl 4.5L, 8 Cyl 4.9L
Less Info
View related parts
Cadillac Eldorado Thermostat,Engine Coolant
Part Number: 12514334
- Other Name: THERMOSTAT, Engine Coolant Temperature; Thermostat
$12.58 MSRP: $22.56
You Save: $9.98 (45%)

Add to Cart
More Info
Fits the following Vehicles:
1982 Cadillac Eldorado | ELDORADO | 6 Cyl 4.1L
Less Info
View related parts
Cadillac Eldorado Thermostat,Engine Coolant
Part Number: 10207373
- Other Name: THERMOSTAT, Engine Coolant Temperature; Thermostat
$10.70 MSRP: $19.20
You Save: $8.50 (45%)

Add to Cart
More Info
Fits the following Vehicles:
1982-1985 Cadillac Eldorado | BIARRITZ, COMMERCIAL CHASSIS, ELDORADO | 8 Cyl 5.7L Diesel
Less Info
View related parts
Cadillac Eldorado Thermostat Assembly, Engine Coolant
Part Number: 1623547
- Other Name: THERMOSTAT, Engine Coolant Temperature; Thermostat
More Info
Fits the following Vehicles:
1982-1985 Cadillac Eldorado | BIARRITZ, COMMERCIAL CHASSIS, ELDORADO | 6 Cyl 4.1L, 8 Cyl 4.1L, 8 Cyl 5.7L Diesel
Less Info
View related parts
Cadillac Eldorado Housing
Part Number: 1646974
- Other Name: HOUSING, Engine Coolant Thermostat; Thermostat Housing, Thermostat Outlet Housing
More Info
Fits the following Vehicles:
1988-1993 Cadillac Eldorado | COMMERCIAL CHASSIS, ELDORADO | 8 Cyl 4.5L, 8 Cyl 4.9L
Less Info
View related parts
Cadillac Eldorado Housing
Part Number: 1625774
- Other Name: HOUSING, Engine Coolant Thermostat; Thermostat Housing
More Info
Fits the following Vehicles:
1986-1990 Cadillac Eldorado | COMMERCIAL CHASSIS, ELDORADO | 8 Cyl 4.1L, 8 Cyl 4.5L
Less Info
View related parts
Cadillac Eldorado Housing
Part Number: 3520936
- Other Name: HOUSING, Engine Coolant Thermostat; Thermostat Housing, Thermostat Outlet Housing
More Info
Fits the following Vehicles:
1988-1993 Cadillac Eldorado | COMMERCIAL CHASSIS, ELDORADO | 8 Cyl 4.5L, 8 Cyl 4.9L
Less Info

Cadillac Eldorado Thermostat Parts Questions & Answers

Thermostat,Engine Coolant
3539588
Q: How to remove and install the thermostat on Cadillac ElDorado and Fleetwood?
A: For 4.5L and 4.9L engines, drain coolant, and remove the upper air filter assembly. Next, unscrew the two bolts of the upper thermostat housing, then remove the thermostat. Install a new thermostat and O-ring, reattach the housing, and tighten the bolts. Refill the system, start the engine, and make sure there are no leaks.