1987 Buick Century Repair Question
My cooling fan only runs with the A/C on
Asked by csm1992Answer
Does your temp gauge work?also do you have a multimeter to do some testing?
Check the coolant fan switch located on upper left side of engine, at end of exhaust manifold. It has a Dark Green/White wire.
I am an above average shadetree mechanic and have tools etc. The plug in question has grn and grn/yellow wires. The coolant temp sensor has one wire attached.
Post a pic of the connector showing it and where its located.The single wire is the gauge the two wires is the coolant temp sensor connector
It says the temp sensor is on left side of engine bellow coolant outlet.
find the fan relay try swapping the relay with another 1.i would replace the coolant sensor that is what controls the fan oper.it grounds the fan relay to turn the fans on when the a/c is off.
If the fan comes on with the ac I would say the fan relay is working wouldn't you cadieman?
yes but the coolant temp. sensor tells the cpu when to turn the fans on when the temp. is to high. the fans are turned on auto. as soon as u turn the a/c on.
Correct but the same relay is used to turn the fan on at the correct temp or when the ac is turned on.So when you said to check the relay that's why I said what I said.
i was thinking the a/c grounds the relay directly from the a/c head when turned on.when u let the sensor ground the relay thats from the temp. sensor.so u have 2 circuts controlling the fan funshion by grounding the relay.1 is the cts and the other is the a/c head.seeya tomarrow im falling asleep.ltr