A/C Prob - Compressor On-Off & Checked w/ Gauge

Small Axe · #1 09-02-2005, 07:58 PM

Hello all,

I have been lurking these forums for a while, and you all have helped me on many issues with my '97 Blazer. Thank you all. I hope you can help me now.

As mentioned, I have a 1997 Blazer LT. My A/C used to work slightly (after a few minutes), but never really made it really cool inside the vehicle.

I bought a recharge kit from Autozone and hooked up the gauge while the truck, and the A/C, was running. The compresser would turn on and off at intervals.

The pressure would reach approximately 60-70 psi, then the clutch would start spinning. The pressure quickly drops to 20psi, and the spinning stops. The pressure builds to 60+ then it all happens again. On-off-on-off, etc.

When the clutch spins, I am not sure that it means it's engagin or disengaging, so forgive me...

The pressure with the A/C off essentially redlines at about 100 psi.

I want to diagnose the problem. I bought the recharge kit - gauge & Fittings, and three cans for about 35 bucks. If it isn't a recharge situation, I would bring back the kit and spend the money on an obvious repair.

Any ideas?

BlazerLT · #2 09-02-2005, 08:05 PM

Are you turning the AC and the fan on MAX when you are testing it?

Small Axe · #3 09-02-2005, 08:10 PM

Yes, the fan is on full blast, and it happens on all dial locations except for the two of them that correspond to the "heat" (i.e. the ones except Max/AC, AC, the defrosters, and another one).

BlazerLT · #4 09-02-2005, 08:21 PM

Your low pressure switch needs to be replaced.

Small Axe · #5 09-02-2005, 08:41 PM

Thanks for the info. I will try to locate the switch from a supplier.

Does that mean the system also needs recharging? Or will I not know until the switch is replaced?

I just tried loading my Chiltons CD, but it was so badly scratched it will not work any longer. I searched for threads on switch replacement, but I havent read thru them all yet. If you know of a particular thread, would you mind passing it along?

Thanks again!!!!

Small Axe · #6 09-03-2005, 04:52 PM

Oh, hell yeah!!!!

Changed the part (24.06 + tax from the dealership), refilled with new refrigerant, and it works like a charm!!!

Thanks again!

97BlazerDude · #7 09-03-2005, 08:08 PM

Just in time for winter!! Sweet!!!

BlazerLT · #8 09-04-2005, 01:14 AM

Quote:

Originally Posted by Small Axe

Oh, hell yeah!!!!

Changed the part (24.06 + tax from the dealership), refilled with new refrigerant, and it works like a charm!!!

Thanks again!

Glad to have helped you.

Just remember in the winter to not use Defrost too much seeing it uses the SC system and will kill your fuel economy.

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