C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

A/C problem blows cold then will go hot for a few seconds

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Old Sep 11, 2008 | 10:22 PM
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Default A/C problem blows cold then will go hot for a few seconds

I have replaced the control head, programmer, blend door motor, inside and outside temp sensors plus the sun sensor. I have check the blend door and it's ok. I can watch the blend door and it will move back an forth every 15 seconds or so. I have tried to unhook the battery and this does not help.
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Old Sep 12, 2008 | 12:11 PM
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Originally Posted by vettes4fun
I have replaced the control head, programmer, blend door motor, inside and outside temp sensors plus the sun sensor. I have check the blend door and it's ok. I can watch the blend door and it will move back an forth every 15 seconds or so. I have tried to unhook the battery and this does not help.

Has the refrigeration system been worked on lately? Freeon added? It could be anything from the metering device freezing to having non condensibles in the system.
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Old Sep 12, 2008 | 12:44 PM
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Sounds like the compressor is short cycling......probably too much (over pressure) or not enough (under pressure) freon in the system.
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