Question about 2003 Chevrolet Monte Carlo

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The Dual Climate Control System in my 2003 MC SS has many issues. The Heat/Cool for drivers and passengers selectors only work some of the time. The rear defrost button does not seem to be working. The A/C button stopped working today 7-14-2009. Will only blow out warm/hot air no matter what is selected. Do I need to replace the Dual Climate Control unit itself?

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Check freon level

Posted on Jul 16, 2009

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Turned off the heat and turned it over to cool air from the upper vents and passenger side was nothing but heat


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Most likely it is the climate control unit. Had the same issue with my 99 Regal, replaced the climate control unit and haven't had any issues since. Might try Digital Dash Solutions on eBay, they will ship you a refurb at1/3 price of buying from a dealer if they have one available. If not, they also have a climate control repair service. I'm not certain that they fix Pontiac products, but it wouldn't hurt to ask.

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I have a similar problem except mine started today changeing from a/c to hot air. I had the system checked at the dealer no leaks etc...I was just told that it could possibly be the climate control/ control switches in the in the dash. Yo could have teh same issue.

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Electronics involved !
The climate control seat system is able to heat and cool the front seats. Each climate controlled seat is operated by push-buttons on the dual automatic temperature controller (EATC) located on the instrument panel. Each front seat temperature is then monitored and controlled by the dual climate control seat module (dual CCSM) located underneath the passenger front seat cushion.

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Sorry , but it would be best for you to take it to the dealer or someother qualified repair shop.

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Only cold air on passenger side


I would assume with multiple people having the same problems, there should be a service bulletin on this issue. may want to call dealer with vin # to verify. sounds like a heater control issue under the dash. something i would leave to the experts for repair

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