I'M having a unusual problem. the rear ac unit blows cold but front ac is warm.

 

Normal condition if the heater valve is not closing.

 

This is typical of the heater valve failing. Either due to a vacuum leak in the system or the valve itself. Many people (including myself) either bypass the heater core completely, or cable tie the heater valve shut.

 

Thanks I'll check that valve!

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Unless you live somewhere it gets cold, then the only option is to fix it the right way.

 

I live in Florida, I'll put a plastic tie on it temporarily and order a new valve.
Thanks

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