Where is the fan relay switch and the fan cooling sencor on a 98 grand am
I just bought a 98 grand am that had been recked they hit a deer. But any how I put the car back together. and I noticed the fan wasnt coming on so I went and bought a new fan for it. Well I got a new one and the fan still didnt come on when the temp got up there. So I direct wired the fan to the batterie and it works. So I am assuming it is the fan relay or fan cooling sensor but I have no clue where they are located so I can replace them. could some one tell me where they are located on this car the motor is a 3100 V-6.
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Re: Where is the fan relay switch and the fan cooling...
Fan usually comes on within 200 degrees. Could be less. Usually the relay switch is under the engine from the front. get under the car and look for a silver switch right by where the electrical wires hook up with the fan.
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The warning light means there is a trouble code which you may already know. The computer commands the relay to turn the fan on, and its not happening. So the trouble code is set.
If you are getting a ground from the computer at the relay, it could be a wiring problem. The computer grounds the relay to power the fan.
On some models one fan is for engine cooling and the other is for ac.
You need to idle the car for a while to get it started to heat up to switch on the fan. the thermocouple must sense the heat to switch on the fan. If not the relay and the fan must be checked individually with an external supply to confirm if the auto sensor is faulty. Also check for the fan fuse if there is no supply to the relay. Finally the speedometer is faulty and needs to be replaced unless it is struck on the high side which can be confirmed ONLY if you remove the panel and tap it to come to rest.
The computer turns on the fan. Based on sensors from the motor. DTC P0480 - COOLING FAN CIRCUIT
The cooling fan is controlled by PCM through the fan relay based on inputs from ECT sensor, IAT sensor, A/C selector switch, A/C refrigerant pressure switch and vehicle speed sensor. PCM controls cooling fan by grounding cooling fan control circuit which turns on cooling fan relay.
The fan relay will be commanded on when ECT reaches 223°F (106°C) or greater, A/C is requested or vehicle speed is less than 38 MPH. Cooling fan relay will also be commanded on regardless of vehicle speed when a DTC is set requesting cooling fan to be on, ECT is 304°F (151°C) or greater, or A/C refrigerant pressure is high. Cooling fan may also be commanded on when engine is not running, on certain conditions.
Conditions for setting DTC:
Battery voltage greater than 9.5 volts.
Cooling fan fault line detects a malfunction for 6 seconds.
1. Check cooling system. Ensure coolant level and belt tension are correct. Adjust/repair as necessary. After repairs, go to step 23). If no adjustment or repairs were required, go to next step.
2. Turn ignition on, with engine off. Using scan tool, check if cooling fan is operating with ECT at less than 209°F (98°C). If cooling fan is off, go to next step. If cooling fan is on, go to step 4).
3. Command cooling fan relay on. If cooling fan operates, go to step 23). If cooling fan does not operate, go to step 5).
4. Turn ignition off. Disconnect PCM harness connector. If cooling fan turns off, go to step 23). If cooling fan does not turn off, go to step 6).
5. Disconnect cooling fan relay harness connector. Using a test light connected to ground, probe battery feed circuits in relay harness connector. If test light illuminates on both terminals, go to step 7). If test light does not illuminate on both terminals, go to step .
6. Disconnect cooling fan relay harness connector. With test light connected to ground, probe battery feed circuit in relay harness connector. If test light illuminates, go to step 9). If test light does not illuminate, go to step 10).
7. Connect a jumper wire between cooling fan relay battery feed and cooling fan battery feed circuit. If cooling fan operates, go to step 11). If cooling fan does not operate, go to step 12).
8. Repair open in battery feed circuit. After repairs, go to step 23).
9. Repair short to voltage in cooling fan battery feed circuit. After repairs, go to step 23).
10. Connect test light battery voltage and probe cooling fan control circuit. If test light illuminates, go to step 13). If test light does not illuminate, go to step 21).
11. Connect test light to battery voltage and probe cooling fan control circuit. Using scan tool, command cooling fan on. If test light illuminates, go to step 14). If test light does not illuminate, go to step 15).
12. With jumper wire still connected, disconnect cooling fan harness connector. Using test light connected to ground, probe cooling fan battery feed circuit. If test light illuminates, go to step 16). If test light does not illuminate, go to step 17).
13. Repair short to ground in cooling fan control circuit. After repairs, go to step 23).
14. Check terminals to cooling fan relay. Repair as necessary. After repairs, go to step 23). If terminals are okay, go to step 21).
15. Check cooling fan control circuit for open or poor connection. Repair as necessary. After repairs, go to step 23). If circuit or connection is okay, go to step 22).
16. Connect test light to battery voltage and probe cooling fan ground circuit. If test light illuminates, go to step 1. If test light does not illuminate, go to step 19).
17. Repair open or poor connection in cooling fan ignition feed circuit. After repairs, go to step 23).
18. Check for poor connections at cooling fan harness connector. Repair as necessary. After repairs, go to step 23). If connections are okay, go to step 20).
19. Repair open or poor connection in cooling fan ground circuit. After repairs, go to step 23).
20. Replace cooling fan motor. After replacing cooling and motor, go step 23).
21. Replace cooling fan relay. After replacing relay, go to step 23).
22. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.
23. Turn ignition on, with engine off. Command cooling fan on. If cooling fan operates, system is okay. If cooling fan does not operate, repeat step 1).
there are 3 things that can cause your trouble .. there is a thermal fan switch (usually mounted on the side of the radiator midway down) ... that might operate the fan directly or thru a relay .. and there is a fuse ... the thermal switch is most likely .. if there is a relay then it should be marked on the panel where several relays are mounted .. same with the fuse .. the fan is normally only on when you are sitting still idling and the temp gets above the thermal switch value ..
Fan wires go to relay, than after relay, they go to engine temperature sensor located on the side of the block. There is another sensor usually attached to thermostat housing. This would be coolant temp sensor. You can test both sensors with an ohmmeter or multi-meter
Relay is in the power distribution center near the battery. does the fan go off when you remove the relay? Relay is turned on by the computer after it receives info from the temp sensor. Why didn't the "guy" order a new relay? Was he a tech in a shop?