A/C blows hot

MARK Z

MEMBER
2004 CHEVROLET SILVERADO
V8
4WD
AUTOMATIC
130,000 MILES

Compressor seems to be engaging. Checked charge and was way overcharged so I decompressed to normal operating range. Checked fuses and relays and still blows hot On both sides. Any ideas? Could it be the actuators?

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Thursday, June 7th, 2018 AT 5:25 PM

3 Replies

ASEMASTER6371

CERTIFIED MECHANIC
52,798 POSTS

Good evening.

What were the exact high and low side pressures while running?

Lets start there.

Roy

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak

https://www.2carpros.com/articles/air-conditioner-how-to-add-freon

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Thursday, June 7th, 2018 AT 8:49 PM

MARK Z

MEMBER
1 POST

I was only able to check the high side using a gauge from a r134a can charger. It was pegged out at 150. Obviously I did not add any to the truck just released the pressure to normal operating range.

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Friday, June 8th, 2018 AT 6:33 AM

ASEMASTER6371

CERTIFIED MECHANIC
52,798 POSTS

That is the low pressure. You need to get a set of gauges to monitor both sides.

You can rent a set at a parts store or buy a set at Harbor Freight for about $30.00.

Then we can get accurate reading and help you out.

150 on the low side is excessive. Was any Freon added prior to this?
Was the A/C working correctly before?

Were there any parts replaced?

Roy

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Friday, June 8th, 2018 AT 11:20 AM