While driving home tonight I had to stop in traffic for about 5 minutes and the heat guage on my 92 Accord with 4 cylinder engine started to climb fast. I switched on the heater blower and the guage went back down to normal. I don't think the electric radiator fans turned on, and they were not on when I shut the car off at home. The electrical connections on the fans look ok and the 20 amp fuse in the fuse box under the hood was not blown. There's also a small fan relay in the fuse box and I don't know what that does or how to check it. The antifreeze level was normal with no visible leaks. Thanks for your help.
- Thread starter Mark FL
- Start date
Farmall 300 u
New User
Change the relay. It take a signal to pull in the relay to turn on the power to the electic fan.
Chances are that the relay went bad. You could jump it temporarily to make sure that you are getting power to it and the wiring to the fans is o.k. If it's a standard 5 pin relay, the main power should be on pin 30 and pin 87 would be the wire going to the fans. Pins 85 and 86 would be the control wires. One would go to ground (normally 86) and the other would have power when the fans are supposed to be on. A temp sensor should be wired into one the control circuit wires, normally on the ground side. The temp sensor would close above say 200 deg., completing the circuit and the fans would come.
If the car has A/C, that would also be wired into the control side of the relay.
If it's not the relay, a wiring diagram would be very helpful so you know where the power comes from and what it goes through.
If the car has A/C, that would also be wired into the control side of the relay.
If it's not the relay, a wiring diagram would be very helpful so you know where the power comes from and what it goes through.
Most cars will turn the fan on any time the air conditioner is on. If you turn on the air conditioner and the fan doesn't come on, its most likely the relay.
If you turn the air conditioner on and the fan does come on, then one of two things is happening. If you have a two speed fan, the low speed relay could be bad. If you only have a single speed fan, then most likely its a temperature sensor.
Look at the fan itself. If there are three wires going to the fan, its probably a two speed fan and you may have two relays to check. If there are only two wires, then its a single speed fan, and only one relay.
Keith
If you turn the air conditioner on and the fan does come on, then one of two things is happening. If you have a two speed fan, the low speed relay could be bad. If you only have a single speed fan, then most likely its a temperature sensor.
Look at the fan itself. If there are three wires going to the fan, its probably a two speed fan and you may have two relays to check. If there are only two wires, then its a single speed fan, and only one relay.
Keith
It was the temperature sensor located where the top radiator house goes into the block. Auto Zone guys told me to unhook the eletrical connection on it and complete the circuit with a paper clip. Voila - the fan came on, therefore the sensor is bad. Have one to put in it tomorrow. Thanks for the help!
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