How to diagnose and fix an overheating engine with a non-functioning cooling fan?

If the engine is overheating and the cooling fan is not coming on when the engine temperature rises, there are several steps to diagnose and potentially fix the issue. First, unplug the fan motor electrical connector and connect the motor directly to the battery with fused jumper wires. If the fan motor does not come on, it will need to be replaced. If the motor is okay, the problem may lie with one of the fan relays. There are three cooling fan relays that can be checked and replaced if necessary. If the relays are not the issue, the wiring and connections to the fan motor should be inspected. If no problems are found, the engine coolant temperature sensor or the Powertrain Control Module (PCM) may be the cause and should be diagnosed with proper equipment. To replace the cooling fan, the negative terminal of the battery should be disconnected and the vehicle securely supported. The lower splash pan, radiator support cover, air filter housing, and torque strut (if equipped) should be removed. The coolant should be drained and the upper radiator hose and upper transaxle oil cooler line should be disconnected. If there is an oil cooler, the retaining bolt should be removed and the oil cooler lines disconnected. The fan electrical connectors and wiring harness should be disconnected, and the fan(s) lower mounting bolts should be removed. The fan(s) can then be unbolted from the radiator and carefully lifted out of the engine compartment. To detach the fan from the motor, the motor shaft nut should be removed, and to detach the fan motor from the shroud, the mounting bolts should be removed. Installation is the reverse of removal, and the cooling system should be refilled, the engine run, and checked for leaks and proper operation.

Genuine Cadillac Deville Radiator fan

Radiator Cooling Fan

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Cadillac Deville Fan Kit,Engine Coolant
Part Number: 22125855
$54.31 MSRP: $78.84
You Save: $24.53 (32%)
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Product Specifications
- Other Name: FAN KIT, Engine Air Cooling(Electrical); Fan, Fan Assembly, Fan Blade
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1994-1999 Cadillac Deville | 4 DOOR, DEVILLE | 8 Cyl 4.6L
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Cadillac Deville Fan Kit,Engine Coolant
Part Number: 22136390
$28.23 MSRP: $51.36
You Save: $23.13 (46%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: FAN KIT, Engine Air Cooling(Electrical); Fan, Fan Blade
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1994-1995 Cadillac Deville | 4 DOOR | 8 Cyl 4.9L
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Cadillac Deville Fan Kit,Engine Electric Coolant
Part Number: 12463003
Product Specifications
- Other Name: FAN KIT, Engine Air Cooling(Electrical); Fan & Motor, Fan Assembly, Fan Blade, Fan Motor
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1998-2005 Cadillac Deville | DEVILLE, HIGH LUXURY, SEVILLE, SLS, STS, TOURING 4 DOOR, TOURING SEDAN | 8 Cyl 4.6L
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Cadillac Deville Fan Asm,Engine Coolant
Part Number: 12487695
Product Specifications
- Other Name: FAN, Engine Air Cooling(Electrical)
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2001-2005 Cadillac Deville | DEVILLE | 8 Cyl 4.6L
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Cadillac Deville Fan Kit,Engine Coolant
Part Number: 22126185
Product Specifications
- Other Name: FAN KIT, Engine Air Cooling(Electrical); Fan, Fan Blade
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1994-1999 Cadillac Deville | 4 DOOR, DEVILLE | 8 Cyl 4.6L, 8 Cyl 4.9L
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Cadillac Deville Fan Kit,Engine Electric Coolant
Part Number: 22098794
Product Specifications
- Other Name: FAN KIT, Engine Air Cooling(Electrical); Fan, Fan Assembly, Fan Blade
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1993 Cadillac Deville | 2 DOOR, 4 DOOR, 60 SPECIAL 4 DOOR, CONVERSION, TOURING 4 DOOR | 8 Cyl 4.9L
- 1985-1990 Cadillac Deville | 2 DOOR, 4 DOOR, 60 SPECIAL 4 DOOR, BROUGHAM 2 DOOR FWD, BROUGHAM 4 DOOR FWD, CONVERSION, FUNERAL COACH, LIMOUSINE 4 DOOR, LIMOUSINE 4 DOOR CTR PART | 6 Cyl 4.3L Diesel, 8 Cyl 4.1L, 8 Cyl 4.5L
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Cadillac Deville Fan Kit,Electric Cooling
Part Number: 22098793
Product Specifications
- Other Name: FAN KIT, Engine Air Cooling(Electrical)
- Replaces: 22036292
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1985-1993 Cadillac Deville | 2 DOOR, 4 DOOR, 60 SPECIAL 4 DOOR, BROUGHAM 2 DOOR FWD, BROUGHAM 4 DOOR FWD, CONVERSION, FUNERAL COACH, LIMOUSINE 4 DOOR, LIMOUSINE 4 DOOR CTR PART, TOURING 4 DOOR | 6 Cyl 4.3L Diesel, 8 Cyl 4.1L, 8 Cyl 4.5L, 8 Cyl 4.9L
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Cadillac Deville Blade Assembly, Engine Cooling Fan
Part Number: 3636687
Product Specifications
- Other Name: FAN, Engine Cooling; Blade, Fan, Fan Blade
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1982-1984 Cadillac Deville | 2 DOOR, 4 DOOR, BROUGHAM 2 DOOR, BROUGHAM 4 DOOR, FORMAL LIMOUSINE, LIMOUSINE | 8 Cyl 5.7L Diesel
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Cadillac Deville Blade Assembly, Fan
Part Number: 15699836
Product Specifications
- Other Name: FAN, Engine Cooling; Blade, Fan, Fan Blade
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1982 Cadillac Deville | 2 DOOR, 4 DOOR, BROUGHAM 2 DOOR, BROUGHAM 4 DOOR | 6 Cyl 4.1L
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Cadillac Deville Fan Kit,Engine Electric Coolant
Part Number: 12463002
Product Specifications
- Other Name: FAN KIT, Engine Air Cooling(Electrical); Fan & Motor, Fan Assembly, Fan Blade, Fan Motor
- Replaces: 12365380
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 1998-2005 Cadillac Deville | DEVILLE, HIGH LUXURY, SEVILLE, SLS, STS, TOURING 4 DOOR, TOURING SEDAN | 8 Cyl 4.6L

Cadillac Deville Radiator fan Parts Questions & Experts Answers

Fan Kit,Engine Coolant
22125855
Q: How to diagnose and fix an overheating engine with a non-functioning cooling fan?
A: If the engine is overheating and the cooling fan is not coming on when the engine temperature rises, there are several steps to diagnose and potentially fix the issue. First, unplug the fan motor electrical connector and connect the motor directly to the battery with fused jumper wires. If the fan motor does not come on, it will need to be replaced. If the motor is okay, the problem may lie with one of the fan relays. There are three cooling fan relays that can be checked and replaced if necessary. If the relays are not the issue, the wiring and connections to the fan motor should be inspected. If no problems are found, the engine coolant temperature sensor or the Powertrain Control Module (PCM) may be the cause and should be diagnosed with proper equipment. To replace the cooling fan, the negative terminal of the battery should be disconnected and the vehicle securely supported. The lower splash pan, Radiator support cover, air filter housing, and torque strut (if equipped) should be removed. The coolant should be drained and the upper radiator hose and upper transaxle oil cooler line should be disconnected. If there is an oil cooler, the retaining bolt should be removed and the oil cooler lines disconnected. The fan electrical connectors and wiring harness should be disconnected, and the fan(s) lower mounting bolts should be removed. The fan(s) can then be unbolted from the radiator and carefully lifted out of the engine compartment. To detach the fan from the motor, the motor shaft nut should be removed, and to detach the fan motor from the shroud, the mounting bolts should be removed. Installation is the reverse of removal, and the cooling system should be refilled, the engine run, and checked for leaks and proper operation.