Question about 2003 Chevrolet TrailBlazer

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2003 trailblazer ac barely works except above 2000 rpm also compressor does not disengage unless over 2000 rpm for about a minute and lowside pressure is also high unless over 2000 rpm for about a min

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  • davidstreble Jun 24, 2009

    Yes fan works fine

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Fan clutch ok?

Posted on Jun 23, 2009

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Posted on Jan 02, 2017

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2 Answers

Compressor keeps turning off and on. Stays on for about a minute. Cycles off. Then stays off. Does recycle after a few minutes. How do I add coolant and where.


It is normal for the compressor to cycle - when a certain pressure is reached in the system, a pressure switch disengages the compressor clutch, and then activates it again when then the pressure drops below a certain point. Unless your air temperature doesn't stay relatively constant, there is no need to do anything. If it doesn't, the system may need recharging and that should only be done at a certified repair shop.

Jul 06, 2017 | AC Cars & Trucks

5 Answers

Ac pump noisy, mech says bad bearing, but can't get part


look on ebay and aadvaced auto make sure u cant get bearing ok i neede done paid 25 on ebay 100 labor install it new ac on advced auto u can see cheaper find local guy install it ok

Oct 11, 2008 | 2003 Chevrolet TrailBlazer

1 Answer

Can i disengage the ac compressor on my pontiac monatna


you can disengage it by not turning the AC on in the vehicle. the AC is engage by the clutch once you turn the AC on in the vehicle. as far as removing the belt from the AC, you can only do that if there is only one belt going to the AC. If you have 1 continous serpentine belt, then no. unless you go to an auto parts store and get a new serpentine belt, but tell them there is no AC on the vehicle.

Nov 24, 2012 | 2000 Pontiac Montana

1 Answer

2003 Mini Cooper S A/C doens't work


Also, make sure the correct a/c buttons are depressed.
Recirculated air, a/c button etc. lower temp.

The AC will NOT blow cold if the radiator fan is not running....period.



Persue the fan problem FIRST.


I would try the least expensive thing first, the pressure switch. Pretty much everything takes a signal from it.
If the pressure switch circuit is open, the fan stays on. If the DME, gets no signal that there is pressure in the line (where the switch is mounted), you get no cycling at the compressor.
You will have to evac and recharge the system after changing the switch, which any decent shop can do.

Sep 18, 2012 | 2003 Mini Cooper

1 Answer

AC cycles on and off when car idles low.


The compressor should cycle on and off. Sounds like the idle needs to be set. There is a pressure sw. on the dryer that might be going bad but the plugs and wires will not cause your problem unless they are just really bad.

May 06, 2017 | 2003 Toyota Camry

2 Answers

2003 trailblazer, ac not working (compressor not coming on nor the belts turning). The outside temp gauge says it is 3 degrees F when it is actually 90+. Is this a sensor switch problem?


Mine did this once. The entire AC control panel was dead as if it was disconnected.
I made it start work again by reseating the AC fuse in the fuse box under the back seat.
Go figure...

Jun 23, 2011 | 2003 Chevrolet TrailBlazer

1 Answer

Engine reving at low speeds when weather is hot


is the rpm changing or the sound of the engine changes,if is the sound of the engine this is normal is you're electric fan clutch. or if you're a/c temp is set to 70 or 75,then is cause by you're a/c compressor engaging and disengaging

Aug 27, 2010 | 2003 Chevrolet TrailBlazer

1 Answer

Where is the ac lowside port located on a 2005 gmc savanna van


The low side port of the 2005 GMC savanna Van is located on the low pressure side of the compressor.

This is found by locating the compressor driven by a belt that has a clutch that engages and disengages as the a/c cycles.

The low pressure piping is always in the larger diameter piping, and the high pressure side is always contained in the smaller diameter piping.

Therefore, follow the thick pipes from the compressor up to the accumulator, which looks like a large can of soup. On the accumulator receiver/drier is a port that connects to the tube that is connected to the can of r134a freon refrigerant.

Simply quick connect the tube to the low side port, which is located on the 'thick' tubing or on the accumulator and then fill until the low side pressure is 25 psi to 45 psi while the compressor is running.

When the car is off and the compressor is not running, the pressure should be 75 psi to 100 psi on a hot day.

Hopefully the system doesn't have a leak slow or fast in it.

Aug 17, 2010 | 2005 GMC Savana

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