Question about 1997 GMC Safari

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The front A/C blows cold but the back A/C is not. the condenser is not even getting cold

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The rear ac has an orifice tube. This restricts the flow of freon.if orifice tube is blown through or the little screen is plugged with compressor debris it will not work correctly. Some ac systems use a expansion valve same purpose but the little valve can get stuck open and just allow freon to flow through.

Posted on Jul 23, 2009

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Buy used parts at car-part.com. Look on page with * to find the cheapest part. Coud be your temp blend door (#2) may not be moving back and forth. Or, you are not getting hot water to the rear heater core.

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You may have to crawl under the truck and feel the heater hoses to see if they are hot. You will find a group of 4 lines, 2 for heater and 2 for a/c. If hot, you know hot water is getting back to the heater core. If not, there may be a hot water vave that's not working. Not sure if EXP. has a water valve for rear.

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