Question about 1988 Chevrolet Corsica

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Coolant fan relay... '88 Corsica 2.0

I have an 88 Corsica 2.0/5speed. I can't seem to find any info (books or online) where the Coolant Fan Relay is located. Thanks for your time!

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I have a problem with my car and i dont have idea where i can find these problem... the engine seems working properly and the oil is in good condition no burning smell, nothing mix of any kind of liquid and its a chevrolet corsica 1995. my problem is the tempereture gage is goes up and down, and the cooling fan does not working continieusly it does work but it takes a while to get running and the coolant is always getting low and i can't find any leakage. could you be so kind to tell me what wrong with this cace than you! john

Posted on Mar 19, 2009

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Trace the wire from the coolant fan motor back a ways. More than likely it's located behind the grille on a support near the radiator, between the radiator and the grille.

Posted on Dec 16, 2008

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Where is the cooling fan switch located on my 2005 malibu 3.5liter v6


Cooling fan switch ? The cooling fans (2) on that motor are controlled by three relays . A coolant temp. sensor gives temp info to the PCM - engine computer .
During high speed operation the PCM supplies the ground path for the cooling fan 1 relay through the low speed cooling fan relay control circuit. After a 3 second delay, the PCM supplies a ground path for the cooling fan 2 relay and the cooling fan S/P relay through the high speed cooling fan relay control circuit. This energizes the cooling fan 2 relay coil, closes the relay contacts, and provides a ground path for the left cooling fan. At the same time the cooling fan S/P relay coil is energized closing the relay contacts and provides battery positive voltage from the cool fan 2 fuse on the cooling fan motor supply voltage circuit to the right cooling fan. During high speed fan operation, both engine cooling fans have their own ground path. The result is a parallel circuit with both fans running at high speed.
The PCM commands Low Speed Fans on under the following conditions:
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• After the vehicle is shut off if the engine coolant temperature at key-off is more than 140°C (284°F) and system voltage is more than 12 volts. The fans will stay on for approximately 3 minutes.
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Watch this video ,it shows how it works !
Relay Driven Dual Cooling Fan Diagnostics

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http://ricksfreeautorepairadvice.com/p1491-radiator-fan-wont-turn-on/

the above link contains test info for the circuit. 3 main problems if the fan itself is good:
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most 93 to 95 have viscus clutch not electric fan (A/C evap fan sure) but some do have the Aux fan too. and the PCM reports DTC errors, if the relay fails. did it? report that?
ok the 95 XJ with 4.0 does have fan.... have FSM in hand.
If the ECT has air pockets it well never report hot temps.
it will not energize the Fan relay if the ECT fibs. for any reasons.
page 35 Chapter 7
the viscous fan locksup at (165° to 180° F).
the electric fan is as follows.
i guess you never looked in the PDC before or its lables
"The fan is controlled by the cooling
fan relay, which is located in the power distribution
center (PDC). For the location of relay within
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and now AUX Fan , quote2.
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Whenever the air conditioning is operated, the
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given these facts? why not turn on A/C and end the guessing.

I use my scan tool , and innova 3140 for jeep OBD1.
it shows me what he pcm sees for ECT readings
if the engine is at 100C and the ECT shows way lower
its bad. or has air pockets around it,
no ect runs in air and works, none,.
if say the ECT is at 100C and the fan relay is not closed
the relay is bad or ECU driver to it blown. (bad ecu)
if the relay coil is hot, and the fan is not the relay is bad.

if the relay is closed and 12vdc out of it, then fan is dead.
if the fan is good (hot wired), and the relay out is hot , the wires are bad from relay to fan.
a $10 voltmeter and the guessing ends.

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Wiring for 88 cadi fan


Well I'm sure there are kits to wire up electric fans on cars that are not designed for one.
You would need a relay and something to turn the relay on. A coolant sensor won't do the trick, the sensor is what tells the computer the engine temp, and the computer decides when to ground the fan relay.
You would need a temp switch that is designed to close at say 220 degrees to ground or power the fan relay.
The fan motor would have ground and power wires.

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Where is the cooling fan sensor on my 1995 chevy corsica


The computer takes info from the engine temp sensor to decide if the fan is needed. The temp sensor is on the intake manifold and has two wires. Check the relay too.

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I have a 2008 Town and Country and the temp gage gets to dead center and I smell antifreeze. Never remember the gage ever reaching the center before either. So I Checked to see if the radiator cooling fan...


ok this might sound crazy but you say you smell coolant but never said if you checked to see if it was full posible bad coolant temp sensor or no coolant passing the sensor please more info on coolant usually if low coolant fan will stay on however you say you smell coolant. If the coolant sensor is bad fan wont command on it will have a high resistance a low coolant temps and low at high temps. I would check sensor since its obviously getting hotter than half way if you dont have coolant leak the relay behind the head light by the way is a common problem I would have just changed it if its original and it grounds to body thats why it is riveted however you can bolt them. Hope this helps check for thermostat opening at right temps to.

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The Powertrain Control Module (PCM) controls the operation of the cooling fans. This is accomplished by providing a ground path for the cooling fan relay coils within the PCM. The relay contacts will close and complete the circuit between the fusible link at the battery junction block and the fan motors. Whenever there is a fan ON request both fans will be running.

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