HVAC problem

Tiny
S_G
  • MEMBER
  • 2003 CHEVROLET SILVERADO
  • 6.0L
  • V8
  • 4WD
  • AUTOMATIC
  • 120,000 MILES
Everything under the hood works fine. Plenty of Freon. Clutch works fine. AC compressor is new. When I turned on the AC switch, it shows on, but compressor does not engage. Replaced relay. Compressor still will not engage. When I install my test manual relay and flip the switch on, AC compressor comes on and AC works perfect. Also, when I connect my scanner and request permission to activate AC, permission is granted and AC works perfect. Why is it that new relays will not make compressor activate but when using the test manual relay with the switch turned on, then it activates?
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Friday, June 8th, 2018 AT 4:55 PM

1 Reply

Tiny
ASEMASTER6371
  • EXPERT
Good morning.

The AC compressor is commanded on by the PCM. It grounds the control side of the relay when it sees the signal from the low and high pressure switches.
Have you checked the pressure switches?

Roy

https://www.2carpros.com/articles/car-air-conditioner-not-working-or-is-weak
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Saturday, June 9th, 2018 AT 6:35 AM

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