Question about 1986 Chevrolet Celebrity
What your doing when you touch the test light to that 3rd wire is actually closing the circuit and powering the fan, like the temperature controlled switch should be doing once the engine warms. That sending unit would be screwed into the cooling system where the water can touch it and most likely is in the radiator lower tank or bottom of radiator side tank. Find that sensor and test the wires for power when engine is hot and fan should be on. You could put a toggle switch on it to activate the fan until you get the proper sending unit/sensor.
Posted on Jul 11, 2017
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Posted on Jan 02, 2017
You will have a blower motor resistor that controls power and the speeds to the blower motor it will be by the blower motor and is cheap new.
Posted on May 24, 2009
Did yo check the fuse panel inside the truck its located on the drivers side dash , you have to open the driver side door, in there is a 10 amp fuse that is linked to rt trailer brakes and rt turn signal for the trailer, if the fuse is good there is a black box under the dash located on the floor on the driver side, just to the left of the break, thats where must of the plug in wire harness is for the trailer breaks!
Posted on Jun 10, 2009
First of all, from the discharge port of compressor to the condenser(the device in front of the radiator) from the condenser to the metering device is all the high side or high pressure. From the metering device through the evaporator including accessories back to intake of compressor is the low side or low pressure.It is important to know that entrained in the refrigerant is oil for lubrication. The combination of pressure and oil could be a safety and environmental hazzard. I know on older GM models one could short out low pressure switch by jumping the low pressure switch with appropriate gage wire. This would temporarily permit one to add aditional refrigerant to system.The job of the low pressure switch is to protect the compressor from burning up due to lack of refrigerant by shutting the system down.. Now, if the refrigerant is low it had to escape, meaning a leak.(refirerants don't just wear out)Refrigerants are notorious to being determental to the environment. Older refrigerants contained hydrocarbons that destroyed or reduced the ozone levels to reduce this from happening strict laws of handling and recovering a/c refrigerants were enacted & exhorbitant costs were placed on the offending refrigerants.In order to save some some money some untrained or knowledgeable people are continuing attempting to repair their systems risking injury like permanent eye injury.Is it worth it? No one (I believe ) intentionally desires to be hurt.However, by attempting to do something that you haven't been trained on can make you more susceptable to injury or accident. An in a instan one could trade off perfect vision to partial or even total blindness.This is not to just to scare you but gives you an opportunity to weigh all the decisions prior to attempting something one might be unfamiliar with.Most of the accidents I've witnessed at home and work were individuals taking short cuts,hurrying or attempting something unfamiliar with.Not all accidents fall into this category but be aware rehab is no fun and often not totally complete. Lets not compromise your safety and the well being of our environment.
Posted on Jul 05, 2009
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 the 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).
Posted on May 16, 2010
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