Chevy Malibu A/C Shuts Off And Then Blows Warm- Service Vehicle Light

Question:
1999 Chevy Malibu 6cyl. (3.1L).Dear JK: my a/c switch or (button) inside the car on the dash its little light is always shutting off and onhen i ant the air conditioning to come on which then shuts the a/c off. What could the problem with my car be?

Answer:
Hello again. As long as when the a/c is on it blows nice and cold then that would tell me the freon charge in the system is good. So then it sounds like you do have a heater control head problem. Those control heads are fairly common for the a/c light flashing and turning off the a/c compressor. You need to replace the control head in the dash. You can find an aftermarket part to save money instead of using the factory replacement part.

Question:
Problem with my 2001 Chevy Malibu. The service vehicle soon Light comes on the dash,. No codes come up with scanner. The car has had some body work after a collision. The service vehicle soon light has been on since the collision. The mechanics cannot find a code to help diagnose the problem.

Chevy seems to have rumors about themselves purposely having computer input this data for the light to come on. How do i turn the light off? Nothing needs to be done to the car. Needed to know how to tell the computer to turn the light off.

Answer:
The service vehicle soon light is different then the service engine soon. This is for a body system problem detected. Usually because of an ABS problem, lighting problem, or a communication problem between several different modules.

Since it was after a collision, it may be that you need to re-program the BCM to learn the new air bag module part #. If you only had the powertrain computer (PCM) scanned, that would not reveal a code for this light.

You need to have the BCM and other modules scanned. If the light is on, there is a code, or a bad module.

The Service vehicle light is alerting you to a problem in one of the vehicles systems, it is just the messenger, so all computers need to be scanned for codes. Most likley the problem is in the SIR system. The SIR module needs to be either reprogrammed, or the BCM needs to learn the SIR controllers information. Believe me, if a warning light is on, something is wrong. If your local shop does not have to ability to find the cause, then it must go to the dealer. Again, most likely an SIR to BCM problem, so the dealer will have to repair it. Even if the body shop can figure out the reason for the light, they wont be able to do the reprogramming