Cooling fans are not working right. 91 vert
06-01-2014, 08:37 PM
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Cooling fans are not working right. 91 vert
So i replaced the radiator and now the cooling fans are not working. If i short the A and B things on the obd1 connecter and turn car to on then they work but if i start the car and hit a/c nothing comes on.
also if i let it heat up all the way the fan doesn't come on. so that would meant the relay is bad right? But why would they work when I ground A to B on the a ldl.
Edit: My a/c doesn't work because i did depressurize the ac system on accident. (Dont know how to fix that) But would that effect both fans?
also if i let it heat up all the way the fan doesn't come on. so that would meant the relay is bad right? But why would they work when I ground A to B on the a ldl.
Edit: My a/c doesn't work because i did depressurize the ac system on accident. (Dont know how to fix that) But would that effect both fans?
Last edited by Joycey989; 06-02-2014 at 02:58 AM.
06-02-2014, 12:27 AM
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It sounds like you damaged the AC condenser and the freon escaped (I did that when cleaning the trash out of the space between the condenser and the radiator). I don't know if they changed the system in 1990 and later cars, but on my car there is a pressure switch in the AC lines that tells the ECM that the AC is on. Then the ECM turns on the cooling fan. Does your AC work?
The ECM runs the fan, which is why it comes on when you short ALDL pins A & B together. That means that the fan, relay and wiring are all good.
What is suspect is the connection from the CTS (Coolant Temperature Sensor) to the ECM. That CTS is the one on the front of the intake manifold under the throttle body. The analog coolant gauge uses a different sensor, so if it works that doesn't mean the ECM CTS is working.
The ECM runs the fan, which is why it comes on when you short ALDL pins A & B together. That means that the fan, relay and wiring are all good.
What is suspect is the connection from the CTS (Coolant Temperature Sensor) to the ECM. That CTS is the one on the front of the intake manifold under the throttle body. The analog coolant gauge uses a different sensor, so if it works that doesn't mean the ECM CTS is working.
06-02-2014, 02:54 AM
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It sounds like you damaged the AC condenser and the freon escaped (I did that when cleaning the trash out of the space between the condenser and the radiator). I don't know if they changed the system in 1990 and later cars, but on my car there is a pressure switch in the AC lines that tells the ECM that the AC is on. Then the ECM turns on the cooling fan. Does your AC work?
The ECM runs the fan, which is why it comes on when you short ALDL pins A & B together. That means that the fan, relay and wiring are all good.
What is suspect is the connection from the CTS (Coolant Temperature Sensor) to the ECM. That CTS is the one on the front of the intake manifold under the throttle body. The analog coolant gauge uses a different sensor, so if it works that doesn't mean the ECM CTS is working.
The ECM runs the fan, which is why it comes on when you short ALDL pins A & B together. That means that the fan, relay and wiring are all good.
What is suspect is the connection from the CTS (Coolant Temperature Sensor) to the ECM. That CTS is the one on the front of the intake manifold under the throttle body. The analog coolant gauge uses a different sensor, so if it works that doesn't mean the ECM CTS is working.
And would that effect the main fan too? Because i ran the car till it was past the point where the fans should come on and neither of them did.
06-09-2014, 01:19 PM
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It's all fixed. When I depressurization my ac system the compressor wouldn't kick on to build enough pressure up to trip the fan switches. So I had the ac system converted over so I can recharge it myself now. The fans kick on. The new Dewitt's radiator makes my car run significantly cooler. All is wonder. The car runs way better then before.
06-10-2014, 09:55 AM
#9
It's all fixed. When I depressurization my ac system the compressor wouldn't kick on to build enough pressure up to trip the fan switches. So I had the ac system converted over so I can recharge it myself now. The fans kick on. The new Dewitt's radiator makes my car run significantly cooler. All is wonder. The car runs way better then before.
