1989 Chevy Celebrity RADIATOR FAN

Tiny
NAVIGATOR41
  • MEMBER
  • 1989 CHEVROLET CELEBRITY
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 100,000 MILES
THE RADIATOR FAN DOES NOT COME ON I HAVE REPLACE THE TEMPTURE SENSOR BUT SILL WONT COME ON. IF ITURN ON THE A/C IT STILL WONT COME ON IF I UN PLUG THE SENSOR IT WILL COME ON
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Monday, March 2nd, 2009 AT 4:33 PM

5 Replies

Tiny
RACEFAN966
  • EXPERT
Has any one checked the radiator fan relay? It on a bracket at the right front corner of the engine compartment. If you have a digital multi meter and would like to test it get back to me.
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Monday, March 2nd, 2009 AT 7:21 PM
Tiny
NAVIGATOR41
  • MEMBER
I just bought this car and am not formilor with when the fan is suppost to come in now it gets really hot and the fan doesnt come on until I unplug the lead from the sensor. Tell me how to check relay and what controls the 2 speed that the fan is suppose to have. And when its to come in. Also I heed a wiring diagram of the fam circuit
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Monday, March 2nd, 2009 AT 11:40 PM
Tiny
RACEFAN966
  • EXPERT
Ok here is how the fan is worked. The fan only has one speed first off. It is meant to come on when you turn on the A/C and moving less then 30 mph or when the temp is 226 F or higher or if a code 14 or 15 is pressent. Now with that said you will need a digital multi meter to test the fan relay. What I need you to do is do an ohms test on the coolant temp sensor (not sender) this sensor is a two wire sensor that is at the rear or transmission side of the engine in the water outlet. Let me know what the ohms are and the temp of the sensor at the time of the test. If you do it when it cold then ambient air temp is fine. Get back to me and we will go from there.
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Tuesday, March 3rd, 2009 AT 10:30 AM
Tiny
NAVIGATOR41
  • MEMBER
I ask you for info on why the fan motor would not come on when the radiator temp is over 220 degrees the motor will come on when I unplug the wires from the tempature sensor the motor will run I replaced the tempature sensor I got a wining diagram on the fan componants it shows a ECM unit in the circuit. Would this be the vehicle speed sensor? And is this the device that controls the fan at speeds of under 30mph?And how to check to see if this is the problem.
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Monday, March 16th, 2009 AT 2:20 PM
Tiny
RACEFAN966
  • EXPERT
Ok first off it only has one speed not several. Here are all the componants that help insure the fan work one is fuse 10 amp hot when key is in run possition. Then there is the fuse link in the front of the engine compartment hot at all times. They both go to the cooling fan relay at the right side of the engine compartment then one wire (dk green with yellow stripe) go to the cooling fan control module hot when key in run. Then a yellow wire goes from the module to the coolant temp sensor and a ground back from the sensor. When the computer sees the temp then it turns the fan on via powering up the cooling fan relay and turn on the fan. The A/C will turn it on as a bypass. So the computer part of the thing is working other wise it would not turn on when you unplug the sensor. So this is that it needed to do.
With your multi meter set on 20 volt scale you will need to check the relay for power ok. It is on the right side of the engine compartment it will have a red, brown, green, and a red with black stripe wire going to it ok. Now check the red wire it should be hot or have better then 10 volts all the time. Now check the brown wire it should be hot when the key is on in the run possition (engine does not need to be running). Now if that checkes out ok then we will check the electonic control module for the fan. Get back to me with what you find and we will go from there.
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Tuesday, March 17th, 2009 AT 10:35 AM

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