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Old 03-30-2012, 09:47 AM   #1
mq124
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A/C troubles resolved

Since last summer my A/C has been acting up. Basically what was happening is that if I had the air blowing out the defrost, mid section, and floor only the mid section would be cool (not cold) and the defrost and floor would blow hot air on A/C mode. I personally was thinking this had to do with the plenum doors not opening and closing when the should have so never bothered much with it, but seeing as summer is coming up quick I decided to try and figure it out. First off the A/C system was recharged properly, but this resolved nothing. After using a scan tool to take a look at the door and motor actuation it seemed as if everything was working properly. Now I was confused. Decided to give in and let the stealership take a look (free diagnosis) and they came back saying that my heater water valve was stuck open, which in turn lets the coolant flow over the heater core constantly which would let the heat overpower the A/C. This made sence to me so I told the dealership to go ahead and fix it for 200 bucks. I thought that was the right thing considering they diagnosed it for free. Well of course, this fixed nothing! And as always the dealership stands by the fact that the heater water valve was stuck open (which I have a very hard time believing). After this for the heck of it I decided to replace the Heater/AC Control Module and this fixed all my problems! Cold air now blows out top, mid, and lower section when told to. I have not had any hot weather to really try it out, but seems as if all is well. I basically just wanted to let everyone know that if your having trouble with a problem similar to mine you might want to take a look into the module as I did. By the way, I did not spend 400+ for a module. I bought a used one for about 70 bucks shipped off ebay
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Old 03-30-2012, 11:44 AM   #2
Mango
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Did you have to code it?
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Old 03-30-2012, 11:50 AM   #3
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No need to code AC unit.
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Old 03-30-2012, 12:05 PM   #4
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There's been mention on the webs that replacing the HVAC unit without coding results in an error message being displayed on the screen.

No??
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Old 03-30-2012, 12:07 PM   #5
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No. At least I've replaced it without any coding and it works fine.
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Old 03-30-2012, 05:58 PM   #6
mq124
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Coming from a dealer you need to code te heater ac module if you buy it new. Since i bought it used it came ready to go. Hope this helps
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Old 07-15-2012, 12:14 AM   #7
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where did you get it from?
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