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Heater not working in extreme cold weather because fan wont shut off. fan has been replace and the computer has been checked. nobody knows what is wrong

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YOUR BLOWER CONTROL MODULE IS BLOWN, AND MAYBE CHANGE THE THERMOSTAT,

Posted on Feb 20, 2015

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I'm making some assumptions, here.. I've been told I make too many assumptions... but, I'm assuming that you're talking about the engine cooling fan.. If I'm correct in this assumption, my guess is that you've not taken the vehicle to a good, reputable mechanic or repair shop. There are several reasons that an engine fan would not turn off, and each reason would have to come from a qualified mechanic. For example, there is a sending unit for the air conditioning system that might cause continuous running... or a sending unit in the air conditioning system that could cause the same thing. To complicate that issue, quite likely your air conditioning system purposely kicks on the engine fan any time you run your defroster. Also, your inside heater should function correctly, regardless of the engine fan running continuously. If I'm wrong on that score, then your engine has a thermostat problem "to boot"... which, by itself, could cause poor heating of the inside of the vehicle. NOW, backing up a little, if you so happen to be talking about the fan INSIDE the vehicle that is part of your heating OR air conditioning, we have a little different matter on our hands... First, some vehicles legitimately have a fan running on slow speed at ALL times.. for continuous air circulation purposes (sometimes, you can't actually hear this). Also, I might add that THIS fan running all the time should not be a problem for the heater to work properly.

Posted on Jan 04, 2014

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Posted on Jan 02, 2017

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SOURCE: 2000 toyota tundra has no throttle response during extreme cold

This throttle body has a TPS ( throttle position sensor) and a Accelerator pedal sensor on it. The TPS is on the drivers side and the APS is on the pass side of the throttle body. When this happened your check engine lite came on then went off when it warmed up and acted normally. The code is still in History codes. Check it with a scan tool. I foget the code number but if it come up with the APS code in History, replace that sensor....not the TPS. It is a sealed sensor that gets moisture in it when the seal deteriates and it freezes in very cold weather.

Posted on Apr 11, 2009

  • 97 Answers

SOURCE: bmw diesel wont start in cold weather, i have

YOU MIGHT HAVE TO INSTALL A BLOCK HEATER TO OVERCOME THIS PROBLEM

Posted on Jan 06, 2010

  • 3 Answers

SOURCE: Heater fan noise-'02 Nissan Maxima

Had same problem. Replace Blower Motor. Over a 100 dollars at local parts store, but found online for half price. About 30 minutes to replace. http://www.rockauto.com/catalog/raframecatalog.php?carcode=1431961&parttype=6916
6 screws to remove glove box, One plastic nut on kick panel and 3 screws hold the blower to the air box.

Posted on Feb 11, 2010

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We had some subzero weather while I was on vacation. My 2004 Jaguar was parked outside for several weeks. We had another very cold, icy day, and heater did not work. Fan works, rear window defroster...


What is happening here is that the faster the heater blows air through the fan, the more it cools the liquid in the heater core, and so heat output is reduced. The root of the problem is either the engine is not warming up enough, or the heater core, and/or heater core lines, are plugged up, not allowing the water to circulate properly in the heater core. Here is what I would try.

1. Top off the radiator and overflow.
2. Is the engine warming up properly? Is your temperature gauge showing normal temperatures? If it is not, then replace the thermostat.
3. If steps 1 and 2 do not solve the problem, get the vehicle in a shop, locate the heater core lines, take them apart and flush out the heater core. Look for blockages in the fittings. Do a flow test on the core. It may be clogged and need to be replaced.

Jan 08, 2015 | 2004 Jaguar X-Type

1 Answer

Fuel shut off p2187


how cold -39F? like my last poster? (far north in canada)
nobody ever posts location, so can't even guess that.
cold to my wife is 68F.
to my car -40F.(or -40C)

1: check all fuses.?
2: fresh fuel, not a winter car , stored all summer >??
3: ever do the 60k mile tuneup ever? or the 120k or the 180K? as mileage dictates?

This car has EFI and as such, starts in cold weather , super well, like no other
system , ever did (carbs) it knows how to set fuel rates based
on true temperatures, the evaporation rate of fuel is very poor
and very cold weather, so goes very very rich to do that.

my wild guess, is the spark plugs are shot. never checked, or serviced ever... just a guess.

Dec 28, 2013 | 2006 Suzuki Forenza

1 Answer

Recommended battery for extreme cold weather (0 to


Sorry low last night here was -15°F, you do not have cold weather.
Any battery that is areplacement for your van will work. Your battery must be old - as older will not have a good of cranking power.

Jan 05, 2010 | 1993 Plymouth Colt Vista

1 Answer

Bmw diesel wont start in cold weather, i have


YOU MIGHT HAVE TO INSTALL A BLOCK HEATER TO OVERCOME THIS PROBLEM

Jan 05, 2010 | 2001 BMW 5 Series

1 Answer

Wacky electrical problem in 2002 dodge caravan


Hi
Check for wires rubbing against brake pedal linkage under the dash.

Apr 01, 2009 | 2002 Dodge Caravan

2 Answers

Heater fan noise-'02 Nissan Maxima


Had same problem. Replace Blower Motor. Over a 100 dollars at local parts store, but found online for half price. About 30 minutes to replace. http://www.rockauto.com/catalog/raframecatalog.php?carcode=1431961&parttype=6916
6 screws to remove glove box, One plastic nut on kick panel and 3 screws hold the blower to the air box.

Jan 28, 2009 | 2002 Nissan Maxima

2 Answers

2004 ford exploer new battery still not kicking over


Make sure you have good clean connections from battery to starter and ground. If all okay, you may want to have a starter draw test performed. 

Jan 06, 2009 | 2004 Ford Explorer

1 Answer

2000 toyota tundra has no throttle response during extreme cold


This throttle body has a TPS ( throttle position sensor) and a Accelerator pedal sensor on it. The TPS is on the drivers side and the APS is on the pass side of the throttle body. When this happened your check engine lite came on then went off when it warmed up and acted normally. The code is still in History codes. Check it with a scan tool. I foget the code number but if it come up with the APS code in History, replace that sensor....not the TPS. It is a sealed sensor that gets moisture in it when the seal deteriates and it freezes in very cold weather.

Dec 05, 2008 | 2003 Toyota Tundra

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