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Hello everyone. I understand that the cooling fans should start as soon as the AC is turned on. Mine don’t. They do eventually start but only when the engine approached the redline.
I took it to a mechanic who said he flushed the radiator and changed the thermostat. It was pretty dirty in the radiator.
Thoughts on this would be appreciated.
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more info… When it gets hot and I give I increase the RPM’s when in park the temperature goes back to normal.
You could still have air in the system. you may need to bleed the
system. Also the ac fan will not come on if the ac charge is low.
Does the ac work?http://www.ericthecarguy.com/faq/what-to-do-when-your-engine-overheats
I would check the main wiring harness at the fans to make sure there is no sign of a bad connection (burned or melted plastic). Additionally, you might check the temp sensor unit ECT (near the thermostat, see image link below). Here is a helpful article if you have access to a scan tool: http://troubleshootmyvehicle.com/gm/3.1L-3.4L/how-to-test-the-thermostat-3 Best of luck with this…
http://troubleshootmyvehicle.com/images/articles-300-399/320/323/image_1.jpg
Bleeding the system is always a great start in these situations but as you pointed out, the fans don’t come on with the AC like they should. That said, there could be an electrical issue somewhere. It might be new enough to store body codes that might indicate what the issue might be. If you can, you might want to track down someone with a scanner that can read those codes. Outside of that, you’ll likely have to track down a wiring diagram for that circuit that can tell you what to check and where to check for the problem. I suspect a control unit or something that’s suppose to control fan operation. That should be verified with testing however. This article may also be helpful.
http://www.ericthecarguy.com/faq/solving-automotive-electrical-problems
Good luck and keep us posted.
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