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What will cause your ac and heater to stop working it do not even blow?

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2005-11-05 15:28:17
2005-11-05 15:28:17

Blown fuse, bad heater blower motor control switch, bad blower motor, or a bad blower motor resistor pack.

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Any of the following can cause this......... 1. Bad a/c - heater controller.. 2. Bad a/c - heater controller inside door operation.. 3. Bad, broken or cracked vacuum line/lines..


The heater control valve is stuck open.


If it is windy outside, you may be getting just enough of a breeze to blow out the pilot light -even though the covers are shut. My heater is in the garage, and even w/ the garage door shut and the covers on the heater shut, very windy weather can still cause enough of a draft to blow out the pilot. You could try to find something to block drafts around the heater such as a hot water heater blanket.



first of all i hate to say an obvious answer but does the heater motor even turn. Does it blow air at all. The first thing i would check is if the fan motor is blowing any air at all. If not u need to put in a new heater fan motor. first of all i hate to say an obvious answer but does the heater motor even turn. Does it blow air at all. The first thing i would check is if the fan motor is blowing any air at all. If not u need to put in a new heater fan motor.



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Engine size, mileage, symptoms eg: I overheated it, etc... Usually overheating it will do it. Even once can cause you grief. Is the cooling system working? Check waterpump, rad etc.




MaybeYou may have it on "auto" not off check all switches off You may have a faulty selector switch. Also some vehicles always blow heat even with the heater off.


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sounds like the heater core is out or you have an air bubble in the cooling system


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Bruising would be the most llikely physical problem. Even more significantly, it would be important to reevaluate your relationship if the "hard blow" was caused by a partner.


Possibly low coolant level or blown heater core.....also check thermostat CHECK COOLANT LEVEL FIRST. IF FULL THEN MOST LIKLY YOU NEED A THERMOSTAT.


You need to back flush the heater core have had to do it to my jimmy 2 times and fixed the problem is easy fix .



When you first plug in the heater have the hood open and in a few seconds you should be able to hear the heater kicking in. It will make a sizzling noise.


The engine needs to be hot in order for you to get got air. On a cold morning, even if you let your truck run for a while, will not get hot enough to blow hot air usually until you drive it for a little bit. When it gets at or near operating temperature there is no reason that it shouldn't blow hot air.




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