Question about 2003 Pontiac Montana

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Coolant fans not working ,fuses o,k and changed 2 relay,s

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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;
DON
dwhitehead4062@verizon.net

Posted on Oct 03, 2008

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Posted on Jan 02, 2017

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SOURCE: radiator fons #1 and #2 wont come on car is starting to overheat!

there is another temp sender on block 2 wire sensor that controls fans

Posted on Nov 12, 2008

DAD5bbbbg
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SOURCE: where is the coolant fan switch for 2002 cavalier

it should be on the bottom of the radiator or by the thermostat housing,

Posted on Mar 25, 2009

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SOURCE: coolant fan not coming on, change motor, relay, censor & fuse sti

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

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SOURCE: 2006 corolla electric cooling fan not working

check the ac switch, evaporator sensor.

Posted on Sep 20, 2009

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SOURCE: 1997 cadillac deville coolant fan

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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