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Got a problem with my heater switch in the car, it's works all fine sometimes then it will not work and blow out atoll

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  • Cars & Trucks Master
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The switch may be defective and in need of replacement.

Posted on Dec 01, 2016


6 Suggested Answers

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Posted on Jan 02, 2017

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SOURCE: Heater does not work

Check blend door motor for proper operation (vacuum operated) if necessary, detach arm from heater box and move by hand. If you have heat then, change motor! You are reaching operating temp for engine, right? If not, thermostat is stuck open... Change.

Posted on Dec 22, 2008

  • 1118 Answers

SOURCE: blower on heater not working

i am no expert on this type of car but you can try this. first i would see if you got power from the switch. if you can get to them. if no power than i would say it is the switch. but also i would find out if there is a resister for the heater. if there is this could also be the problem. heater resisters chg. the speeds for the heater motor and also make heater motor run. its either located on the heater box or the air evaporator box if it has one.

Posted on Jan 06, 2009

  • 38 Answers

SOURCE: heater in car doesn't bow hot air but the air condintioning works

the heater blows air that is ambient temperature right? If so, there is a blend door in the ducting of the system. this enables you to use one blower motor to push hot air, cold air, or a mixture of the two. it seems likely that something in the control system of this door, or the actuator that turns it has faulted. It is controlled from the BCM (body control module). so, unfortunately, this will likely require some electrical diagnostics.

Posted on May 12, 2009

  • 454 Answers

SOURCE: Car Heater Not Working - Blowing Cold Air

also check to see if tube that runs your climate door is not pinched or broken. the vaccum tube that runs the climate door is behind and under the battery. i had same problem a year ago and the tube was partially cut. i fixed it by cuttinga piece of aquarium tubing and spliced it back together. one other thing.....check to see if your radiator over flow cap is tight. your cap maybe bad and or cracked this would also cause the problem.

Posted on Jan 29, 2010

  • 463 Answers

SOURCE: 94 nissan pick up 2.4L; Heater doesn't blow hot

It could mean that, but here are a few things to try first that could cause the same symptoms and save you a good bit of time and money.
1. It is most likely the thermostat sticking.

What the thermostat does;
It seperates your coolant into two parts. The first part is in your engine, the second part is in your
radiator and the coolant reservior. When the coolant in the engine reaches the temperature rating
on the thermostat the thermostat opens to allow the two parts of coolant to change places. Now
the cooled coolant in the radiator and reservior flows into the engine while the heated coolant flows
from the engine into the radiator and reservior to be air cooled by the radiator fan.
How to test the thermostat in most vehicles;
Make sure the heater is off, start the engine and let it run for 6 to 8 minutes, ( this will allow the
engine to reach, " normal operating temperature "), from the inside of the vehicle turn the heater
temperature on high and turn the fan speed on high.
1. Listen very closely for a click sound from the engine, ( most thermostats make a click when
they open )
2. Watch your temperature guage, it should begin to lower as the coolant starts to circulate.
3. Usually within a few minutes the radiator fan will kick.

If the thermostat seems to be working, you could have blockage in the cooling system.

Checking coolant circulation;
After the engine has ran for 6 to 8 minutes, and the heater has been on for a few minutes, turn the engine off and very carefully reach behind the engine, at the firewall and feel both of the hoses that go to the heater core. ( the hoses are usually about 1 inch in diameter ).
If both hoses are hot, then you should have good criculation, however, if only one of the hoses are hot there is something blocking the ciculation.
I usually flush the whole cooling system first and if that doesn't fix the problem then you need to check, or have checked, the heater core valve. It's usually in the cab near the heater core, but some vehicles do have them in the engine compartment.

I hope this information was helpful to you, if it was, please consider taking a second to click on YES beside the question, " was this helpful ". 2 thumbs up is a failing grade.
Thanks, Donnie

Posted on Feb 21, 2011

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