Automotive Air Conditioning Information Forum (Archives)

LoJo on Tue August 03, 2010 7:37 AM

Year: 1993
Make: Corvette
Model: LT1

I was just reading through other threads and noticed something... could someone please enlighten me.

Does a vehicles heater have some interaction with the AC?

My heater core is currently by-passed, because it is leaking and is a real pig to change. Would this affect AC operation/efficiency (once I get my AC back together!)?

98audiA4 on Tue August 03, 2010 9:09 AM

only if for some reason air is passed over the heater core at all times and a heater core bypass valve is used. i gather that some vehicles used this method while others use a blend door to direct air away from the heater core when not in use.

LoJo on Tue August 03, 2010 12:14 PM

Thank you for explaining 98audiA4, much appreciated.

I think mine has a blend door arrangement.

SeppW on Sat August 14, 2010 2:16 PM

I've read the AC system dehumidifies the heated air in defrost mode. Have you noticed when turning-on defroster on AC-equipped rides, the compresser runs? But in your case, a cold ride in winter.

Edited: Sat August 14, 2010 at 2:23 PM by SeppW

Dave in Texas on Sat August 14, 2010 6:23 PM

If your core wasn't bypassed and the blend door wasn't working correctly then that would affect the conditioned air in the plenum from the AC system.

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At 2, I went home with a 10. At 10 I woke up with a 2 !!