Compressor Cycling...nothing on.

[krismoriah72]

2003 Suburban 5.3 .. I noticed the other day that the a/c compressor was cycling on and off. Everything HVAC is off but the compressor was still kicking in and out at idle and while driving.

Its nearing winter here so I just pulled the A/C compressor relay and that stopped the cycling.

I tried messing with the controls to make sense of it.. heat on- floor (still cycles). All OFF- (still cycles). Rear Heat on- (still cycles).

I stopped the cycling by removing the relay- no sense in lesser mpg and wear and tear on the compressor if not needed..


Any thoughts?

 

[Trav]

It could be just a bad relay, its common enough on these to fail. Its more common for them to fail when On but its the cheapest thing to try and eliminate.

 

[bioburner]

Some will cycle year round to keep the seals from getting a set and leaking

 

[mk378]

In the older systems, which your truck may be old enough to have, the control panel grounds one wire to request the A/C come on -- so it could be a bad control panel or that wire is shorted to ground.

 

[ARCOgraphite]

could a Door sensor to defrost position be stuck? Just throwing out moronic ideas.

A short or something schtuck that would call for compressor-ON makes sense.

 

[LeakySeals]

I assume its the same as my 06, where "auto" or just turning on the HVAC turns on the A/C and you get the illuminated snowflake.. and you have the option to turn the AC off. What happens when you try to disable AC from the dash? I was reading somewhere that panel can go awry.

 

[JMJNet]

Go to the Chevy truck forum and see what is going on and if there is any solutions.

It is an older truck so if there is solutions, it should be there.