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Does heater core affect AC.

LoJo on Tue August 03, 2010 7:37 AM User is offline

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 User is offline

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 User is offline

Thank you for explaining 98audiA4, much appreciated.

I think mine has a blend door arrangement.

SeppW on Sat August 14, 2010 2:16 PM User is offline

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 User is offlineView users profile

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.

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

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