Question about 1990 Mazda MX-5
My cooling fan only comes on when the airconditioner is on , and not the a/c fan. the car overheats because the cooling fan does not come on. i already tried testing both fans directly and the both work. a mechanic looked at it and said it was not grounded somewhere. i am trying to get the fans working correctly and get the a/c working also. Help!
A multimeter is good but can give you a false reading . i would check with a test light first
Posted on Jun 23, 2008
Your problem is nothing to do with electrics, it's your thermostat.
What's happening is that the thermostat isn't registering that the radiator is hot and so doesn't open the value to the top hose. The fans will work only when triggered by this sensor. That's why when you switch on your air con both fan work fine. As a double check you'll find that the top hose is hot but the bottom hose is cold, they should be the same temperature. Just be careful when reaching the bottom hose as it's hard to get to. Thermostats are only £12 from Halfords c/w gasket.
Posted on Sep 01, 2008
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Posted on Jan 02, 2017
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