The compressor won't kick on, but had the compressor checked and everything is operational and freon level good, one guy said that it is probably the vent stuck open on only allowing heat to come out and the control module is bad. He wanted to charge around $900. I was a little sceptical so I got a second opinion. And seeing as how the A/C did work fine before, I didn't see how it could just all of a sudden have multiple problems. The dealership (second opinion) told me more than likely it was the HVAC control module, and it would make it appear to be a vent stuck open as well. Also when I press the A/C button or the recirculation button, no lights come on and of course no compressor turning on either, nothing but hot air coming out.
An expert who has achieved level 3 by getting 1000 points
An expert that got 10 achievements.
An expert that got 5 achievements.
An expert whose answer got voted for 500 times.
Re: 2003 Chevy Trailblazer A/C Problem
Try jumping the low side pressure switch on the accumulator if compressor comes on then it is this switch bad.
when you say blowing hot air is it blowing heated air?or just warm due to compressor not kicking on
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Have you checked transmission fluid recently. If the levels are low and/or if the dipstick smells burnt, there is a good chance your transmission is shot. Check it out & let me know; may have another idea if the fluid level checks out.
It is probably low on freon. The low pressure switch will turn it off to protect the compressor because it needs the freon to circulate the oil. Hot-wiring it defeats the purpose of the low pressure switch and runs the compressor without oil. If you have not already destroyed your compressor by hot-wiring it, you can probably get it working better by charging the system.
You need to check the freon level and if that is good check the compressor. If you have no pressure on the low side, when I say pressure on low side I mean vacuum, then most likely the compressor is bad or you have a leak someplace. You can get a freon fill kit at Walmart, Target, Auto Zone and most any auto parts stores. These kits comes with a gauge and connection hose. Typically if the freon is low the compressor won't activate. Connect the fill hose to the low Side of your AC and turn the AC on to Maximum with the engine running. If its a low freon problem the compressor will start to kick in as the pressure increases. Make sure you don't overfill the system as this will cause a seal or line to blow. Being a 1998 your vehicle should use R134A freon which is what can legally be purchased by a home mechanic. It cost about $12 to $20 a can and usually includes a leak detector additive and seal conditioner.
Many newer cars have a low-freon sensor that prevents operation of the compressor if it is indeed low on freon. There is a relay, fuse, and the computer associated with the electrical operation as well. Have the freon level checked before looking for other causes. Hope this helps!
If it is cycling then its low on freon .. Try to put in one can and this will take care of your problem.. The cycling is due to being low .. The clutch is operated by a pressure switch .. when the clutch kicks in it pressures up but not enough freon will kick it back off and starts over again ... Thanks Jerry