6victor12

when I turn on my defroster to hot, the air compressor kicks on and off. why is this?. my air conditioner works great. I read this forum and found out how to charge it correctly thanks for your help.

wolfox

The A/C runs in defroster mode because of two reasons:

1) Prolonged sitting time and disuse of the A/C in winter leads to seal rot and pressure loss of coolant. Recirculating the A/C for 10 minutes a month is enough to keep seals fresh and the gaskets nice and swollen in the system.

2) Cool air carries less moisture. What fogs your windows in the cold? Moisture. The running A/C dries the air by condensing the water out of it before being blown on your windshield glass.

In short - nothing to worry about. It was *designed* to do this.

BlazerLT

Yes, and don't use the defrost when you don't need to.

It will hurt your economy and with gas prices like they are now, every MPG counts.

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1995 Factory Blazer Service Manual for sale, PM if interested.