| mcmanus7 |
My a/c works 100% perfect if I turn on my vehicle with the a/c switched to the on position and to the a/c setting..... however after driving for about 1-2 minutes... if I turn my a/c off and then decided to turn it back on again.. it will not turn on. The odd thing is that if I turn my car off... then back on I can switch the a/c on and off within that 2 minutes with no problem..... any suggestions?
oh and please do not suggest a recharge... a recharge is not the problem |
|
|
| moronicicon |
File In Section: 01 - HVAC
Bulletin No.: 99-01-39-007B
Date: March, 2003
INFORMATION
Subject:
Automatic Air Conditioning Control Operation
Models:
1997-2003 Passenger Cars and Trucks
2003 HUMMER H2
with Automatic Air Conditioning
This bulletin is being revised to update the model years and add HUMMER. Please discard Corporate Bulletin Number 99-01-39-007A (Section 01 - HVAC).
Automatic air conditioning functional description:
Vehicles with automatic air conditioning (single and dual zone) have both automatic and manual operating systems.
For the system to operate automatically, the system controls must meet the following criteria:
1. The temperature setting must be one step warmer than the coldest allowable setting.
2. The temperature setting must be one step cooler than the warmest allowable setting.
3. The fan speed selector must be in the automatic position, no driver input to lower or raise the blower speed, after the auto button or key pad has been pushed.
4. The air flow selector must be in the automatic position, no driver input to change the air flow output, after the auto button or key pad has been pushed.
If these conditions are not met, the system is considered in the manual mode.
1. In the manual mode, all indicators of automatic operation (i.e. lights, messages, etc., depending on the vehicle car line) will be off.
2. Manual mode is when the driver air conditioning controls are in the full hot, full cold, non-automatic blower speed or non-automatic air distribution control positions.
Do not replace air conditioning controls, as the system is functioning as designed.
Hope this helps you........ |
|
|
| mcmanus7 |
| hmm... good info.. but not sure if it is what I need.... both automatic and manual a/c functions work 100%... but after 1-2 minutes after the car is started... if I turn off the a/c either by turning off automatic or if it's in a manual mode and I de-select a/c.. nothing will work... automatic or manual.... |
|
|
| clapbak |
check and see if your a/c clutch is engaging?
Look @ your a/c compressor,
Picture kindda..
[==]Ii
[==] = Compressor Housing
I= Belt
Infront of the belt / Pully - (i) Is your clutch, (dont touch it it will engage and rip your finger tips off).. see If it Cuts in / Out..
If its cutting in / out.. maybe its a stuck blendoor?
Set your cars stuff to Recirc the air, then turn on your a/c..
Set your car for fresh air, then turn on your a/c.. PLay around with it.. see what one works? (blend door issue's?) |
|
|
| mcmanus7 |
the clutch / compressor kicks in.... and stays engaged as long as I have selected either automatic or manual a/c in the first minute - two minutes the car runs.... I can kick it in as many times as I please... and as long as I have it selected to a A/C setting from the time I start the car it will blow cold and stay engaged for the entire trip I take.... and it blows cold on all appropriate settings
I have the official GM service manual for my vehicle (the exact same one the dealerships use)... and it describes 4 scenarios that will prevent the compressor from kicking in...
1. Wide open throttle
2. Low idle speed
3. low air temperature
4. high P/S loads
I have verified that 1-3 are not the causes.... but cannot figure out what they mean by High P/S Loads |
|
|
| mcmanus7 |
| hmmm does anyone know what a A/C Refrigerant Pressure Sensor does? I just noticed the wiring harness leading to this sensor was rubbing on the serpentine belt and one of the wires is cut |
|
|
| clapbak |
Yes LP / HP Sensors.. Sence the Refig Pressure (too high or low)
Low = low refrig sensor, so if there is low refrig, a/c wont work..
HP = Will also cut it out so the refrig doesnt shoot out the back of the compressor (relief)
that would be it.. |
|
|
|
