A/C does not blow air cold until truck has warmed up

SKYLARDOG123

MEMBER
2004 CHEVROLET SILVERADO
5.3L
V8
4WD
AUTOMATIC
210,000 MILES

My truck doesn't blow cold when I first crank it, it has to reach operating temperature first (205°f) after that, it's ice cold. The compressor runs the whole time but it isn't blowing cold until it reaches temperature, any ideas?

New high and low pressure switch, new climate control switch, the condenser is clear of debris. Truck is equipped with electric fans that turn on at 185 degrees.

5 Replies

MASTER ASE TECH

MEMBER
82 POSTS

Hi, I'm Dan. If the compressor is running, then we want to feel the lines going into the evaporator core at the firewall to see if they are cold. Any chance of getting pressure readings on the system?
Also, when the truck is first started, does the mechanical fan make noise like it's working? Does it flow a lot of air when it's idling with the A/C on? There is a possibility that the mechanical clutch is not working.
I've attached a pinpoint test for checking the fan.

There is also the chance that the A/C system is low on refrigerant.

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

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Wednesday, August 4th, 2021 AT 11:44 AM

SKYLARDOG123

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4 POSTS

A/C lines are cold, just had system vacuumed and charged as well, I don't have a mechanical fan, I have electric fans that kick on at 185 and 195.

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Wednesday, August 4th, 2021 AT 7:18 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

Good afternoon,

Can you give us the high and low-side Freon pressure readings when the A/C system is running? We need to see that to be sure the pressures are correct.

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

Roy

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Friday, August 6th, 2021 AT 1:28 PM

SKYLARDOG123

MEMBER
4 POSTS

I'm not sure the exact number but I had my dad vacuum and charge it with 28.8 oz like Friday hoping to fix my issue and it did not.

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Friday, August 6th, 2021 AT 1:53 PM

ASEMASTER6371

MECHANIC
52,797 POSTS

Okay, I need the high and low side readings as a start to determine the issue.

Please post them when you get them so I can help.

You can rent a set of gauges at a parts store or buy a cheap set.

Roy