Heater Blower Cold Problem
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Tuned
Joined: Jul 2011
Posts: 257
Likes: 5
From: Ceres, CA
Heater Blower Cold Problem
When it's cold outside (below 45) the blower motor will not turn on in heat or A/C mode but as soon as it warms up enough to check it the dam thing works. So I will need to diagnose it while it's cold. Anybody ever had or heard of this problem or any ideas on where to start looking?
Engine Temp doesn't seem to affect it. The engine warms up by time I get to work but the fan still doesn't come on but it works everytime when I go home in the afternoon.
Engine Temp doesn't seem to affect it. The engine warms up by time I get to work but the fan still doesn't come on but it works everytime when I go home in the afternoon.
Thread Starter
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Tuned
Joined: Jul 2011
Posts: 257
Likes: 5
From: Ceres, CA
That sums up my week. Wierd.. I installed a new remote PLC last week and all this week it's been locking up without any errors. Maybe it doesn't like the cold too.
Hopefully this Bump^^ wil gather some insite on this problem from others who know where I should start looking.
Hopefully this Bump^^ wil gather some insite on this problem from others who know where I should start looking.
Elder User
Joined: Mar 2012
Posts: 609
Likes: 0
If the resistor is cracked, temperature could cause warping that could open the circuit or close it. Pull the blower resistor, and ohm each of the circuits (three or more plugs, common ground) when in is cold. Also look for cracks in the stabilizing structure on the coils.
This is the only thing I could guess.
This is the only thing I could guess.
Elder User
Joined: Mar 2012
Posts: 609
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True. High speed is straight through, with no resistor. Does high speed work?
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Lead Driver
Joined: Sep 2007
Posts: 8,180
Likes: 669
From: Scio, OR
critter is right, if the fan is on high, the blower motor resistor is completely bypassed. I would be thinking along the lines of an intermittent blower motor relay myself.
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