A/C not blowing cold air

Tiny
TONY02
  • MEMBER
  • 2002 TOYOTA COROLLA
  • 135,000 MILES
The A/C doesn’t blow cold, the compressor is engaging, and I hooked up my gauges to make sure there is refrigerant in it and there is, but it’s not blowing cold. I also felt the low-pressure line and it doesn’t feel cold or isn’t “sweating” like it should be it’s just dry.
Sunday, June 12th, 2022 AT 3:57 PM

5 Replies

Tiny
BORIS K
  • MECHANIC
  • 836 POSTS
Hello,

As you have gauges can you please confirm the system pressure when A/C is switched off and low/high pressure when system is operating.

Also is the cooling fan operating when the A/C is switched on?

Cheers, Boris
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Monday, June 13th, 2022 AT 2:03 AM
Tiny
TONY02
  • MEMBER
  • 86 POSTS
The low side is around 50-60 and the high side was around 150-200. Yes, the cooling fans are working, but I also notice that the compressor clutch stays on it does not disengage.
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Monday, June 13th, 2022 AT 3:27 AM
Tiny
BORIS K
  • MECHANIC
  • 836 POSTS
Hello,

The low-pressure side looks a bit high, you should have about half, 26-36 PSI at 1500 RPMs.
The high pressure is also a bit low, expect to see 225-250 PSI.
You either have too little refrigerant or a possible faulty expansion valve.

Cheers, Boris
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Monday, June 13th, 2022 AT 6:42 AM
Tiny
TONY02
  • MEMBER
  • 86 POSTS
Upon looking for expansion valve I found the evaporator core with it, and it was really filthy and dirty. My guess is the evaporator core from being dirty was giving me the issue.
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Wednesday, June 15th, 2022 AT 6:12 PM
Tiny
BORIS K
  • MECHANIC
  • 836 POSTS
Hello,

It does sound plausible that this is cause of the air-conditioning not blowing cold.

Please keep us posted on the outcome

Cheers, Boris
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Friday, June 17th, 2022 AT 5:39 AM

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