Question about 2003 Pontiac Montana
Hi: I use to do a lot of auto mechanics ,not too much anymore, but it sounds like your mercury switch isn't working. there is a switch that works off of the hot water on some vehicles that basically trips the fan on and off. Some people bypass this switch, makes the fan come on and stay on as soon as the key is turned on from the ignition, I wouldn't advise it but if you do the bypass and the fan works then you know where your problem lies. I think they call it a thermatically switch control. Just trace your fan electric wires from the fan to there destination.
Hope this helps. You could have saved some money on relays had you done this first;
Posted on Oct 03, 2008
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Posted on Jan 02, 2017
if the fans are not broken, here is a way to check them--- disconnect fans at wiring connection, then run a wire from positive on fans to positive post on battery,then run other side to ground if nessesary. if the fans are ok they will turn on. if not the coolant temp sensor is bad. or a short in wiring.
Posted on Aug 30, 2009
with the a/c on, the fan should be on. crank it up, turn a/c on, now take a hammer and gently tap on the coolant fan, if it comes on, or attempt to spin, its bad.
Posted on Oct 19, 2009
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