Question about 1992 Pontiac Bonneville

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Cooling fan is not coming on at all how do i wire it up to come on when car is started and stops when car is turned off

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  • Zaraki Jun 04, 2010

    The hardest part is to find a good heavy 10 ga. wire that is hot when the key is in the "Run" position, and has no power to it when the key is in the "Off" or "Acc" positions, and the fan will work with the key. Let me know if you can locate a similar wire on your vehicle using as test light or volt meter, or if you can not locate a similar wire then It can be done using a toggle switch to control the fan off and on, but you will need to decide which one you are going to use so I can give you the right installation directions.

  • Sharon Burton Jun 04, 2010

    toggle switch should work i just need the fan to work i can't pay anyone to fix any help would be great.. car is v6 3800.. thank you very much

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Here is a wiring diagram of how you should by-pass that cooling fan by using a toggle switch, and you can get a fuse holder and use a 30 amp fuse instead of a 30 amp circuit breaker, but you should use the circuit breaker since you are no longer using a relay, and if there is a voltage spike the circuit breaker will reset itself, and a fuse will blow out and you will have to change it. Most auto parts stores will carry the 30 amp toggle switch and circuit breaker, also be sure to use 10 ga. wire and do not forget the wire connectors that you will need to attach the wires to the toggle switch, the circuit breaker, and to the battery as well as the connection to the cooling fan wires.

This wiring diagram is very basic and you should be able to follow it with little difficulty, and you should also dis-connect the cooling fan at the wiring connector to the cooling fan and connect the by-pass wiring directly to the cooling fan motor so that you do not run voltage back through the stock system. Let me know if you require further assistance.


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Posted on Jun 04, 2010

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I had a similar problem. try getting a electric fan, then wire it up to ur battery, and have a toggle switch inside. u need to turn it on before u start engine, then turn off when u turn motor off.

Posted on Jun 04, 2010

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Posted on Jan 02, 2017

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SOURCE: How does the fan operates, does it starts and

the cooling fan should come on about 105-107C and shut off about 95-97C
does the car overheat just sitting running not moving
but if the car overheats on the highway then it's not the fan
check the fan operation run the car till the gauge is over half and watch the fan
if the fan woks then check coolant level if that's ok then try a thermostat
hope

Posted on Nov 19, 2009

Testimonial: "Took car to mechanic and found engine bottom seal letting in air, mechanic estimate crack seal,causing air in and shutting down car. Expensive repair"

loveamouse77
  • 6 Answers

SOURCE: why does the cooling fan stay on never shuts off?

If you are not the first owner it may be wired to the ignition, Previous owner may not have been able to get it to come on?

Posted on Aug 31, 2012

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