My AC works fine when it is on and so does the heat and all the controls, but sometimes you will have it on, then stop somewhere, get back in the car and nothing the screen is blank and the controls do not work. Then you will be going along and all of a sudden it is back on and working. If it is on, when it stops working, then it is still on, when it starts working again. Same with it being in the off position. It makes no unusual noises at all. I can tell you, that when it is working so does the cruise control and the automatic headlights, but when it is not working then niether do the other items. It may do this off and on throughout the day and had gone off and stayed out for as long as 2 days. Then comes back on all of a sudden and works fine.
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Re: AC/Heat goes on and off
Your first area you need to look at is your fuseable links. It sounds as if you have one burned inside the coating. Grab each link and move it back and forth in your fingers. Try to determine if one is broken on the inside.
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Turn the blower fan on high and see if the heat goes away.
It may be the low speed fan resistor, sometimes it's directly behind the control.
Did you try other settings? Heat instead of AC, AC regular vs AC MAX, or just Vent?
You didn't tell us what vehicle or year and we're not the psychic hotline, so this is my best guess.
Is it the original thermostat? You'll find some have an open switch and some a closed switch? What vehicle is it? Make sure it's the original switch and that the fuse didn't blow when you replaced it as sometime the cable can touch and short out.
There is a blender that controls the air flow to go through the heater core for heat, and the evaporator for AC. It very well could be stuck.
You maybe able to try and get it to get unstuck by running the cars AC and switching from heat to AC back and forth and see if it gets unstuck. Just turn it on full blast and go from heat to cool.
If that fails, then you may need to service it. There should be a Lever Marked VENT under the dash, usually by the Brake
and other pedals on the Driver's Side. Close the VENT and that will
stop the Air from coming in and leave the A/C Blowing through the
I also read this online if you have an electronic climate control. "On
climate control press off and heat button and let go quickly. Then
press automatic. The display will start rotating eventually displaying a
code 025,125 , 024 etc. Then press defrost to stop. You may hear blend
door operating atb that time. It worked for my climate control."
does your cruise control work??? I had no heat or a/c intermittent, and cruise did not work. I replaced the ignition switch (behind the key) and everything works fine now. Switch was 80 dollars and about 2.5 hours of work... the shop wanted 450 dollars.