Problem with cooling system

SATURN
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LOZOYA29
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I have a 1993 Saturn SL, motor 1.9, 102000 miles.

The problem is that the cooling fans does not turn on, they relay is good, the fuse is mint. Even when I turn the AC on it does not move. I check the activation signal for the cool fan relay and the negative connection is not good because I put a jumper to the chassis and the relay worked fine. However I don't know if that signal is coming from the computer or the temperature switch. Can you help me with it? Also I don't know where that temperature switch is located and if it has something to do with the fan not working when the AC is on.
Apr 12, 2007 at 10:19 AM
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PEPPERMRJ
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The computer energizes the cooling fan relay. it does this after input from the coolant temp sensor or the AC switch.

Since the fan works with a jump to ground that is what I would focus on. Run a new ground and see what happens.

The coolant temp sensor should be updated to the newer brass tip design from Saturn if it has not already been.

See https://www.2carpros.com/forum/saturn-sc-1-1995-vt4925.html?highlight=wolfman for detailed instructions.

Good uck and let us know. :)
peppermrj
Apr 12, 2007 at 7:57 PM