Automotive Air Conditioning Information Forum

A/C clutch will not engage. I can jump with a paper clip at A/C clutch relay and clutch engages and A/C blows cold air. When I check freon on low pressure side it is perfect. Replaced A/C clutch relay and clutch will still not engage. Is the problem upstream from the relay to the electrical end since when I jump the A/C clutch relay the A/C blows cold air?

Toddmann wrote:A/C clutch will not engage. I can jump with a paper clip at A/C clutch relay and clutch engages and A/C blows cold air.

You are likely low on refrigerant or your pressure switch is bad. Do not simply jumper the switch and run the unit, except for the test that you did, can damage the system because the refrigerant carries the oil.

Toddmann wrote:When I check freon on low pressure side it is perfect.

This is not a real good way to ascertain pressure or fill, get a set of real gauges. By the way, you have R134a (not freon) in your 2004 AC system.

Fixed it. Thanks for response.

Toddmann wrote:Fixed it. Thanks for response.

Todd - you're supposed to post what was wrong, and what fixed your truck, to help others here !!! We all keep learning.