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I don’t know why, but when I turn my A/C on both my radiator and A/C clutch stop working and air gets hot, but when I turn the A/C off it works again. But as soon as I turn it on the air is cold and starts to warm up cause the clutch is not engaged.
Hi, Don’t know your vehicle but here’s a link that may be of some help. Scroll right to the bottom and check the sections How to Troubleshoot the HVAC System Using the Self-diagnostic Function and How To Reprogram The HVAC System For Manual A/C Compressor Control to see if that is any help.