Cooling fan does not kick on

Marvin

• 85242 Answers
• Posted on May 17, 2010

SOURCE: can't find the cooling fan relay. Were is it

it is a solid state relay, this is very diff from a lttle standard relay used by most care makers and it is hard to find, it is behind the left headlight which u must remobvet to access the relay, carefyl check the wiirng to the relay out to the engine fan, it melts! rep;lace as ness with proper size, no less than 14 gauge autmotive grade wire, solder and shrink wrap repairs. below is a diagram of the location.

SOURCE: cooling fan does not kick on, and temp. of vehicle

Jeep has a very common problem with fan relay going bad. Sounds like it was stuck on at first,causing it to stay on all the time. Now its bad, wont energize fan. It is located between grill & bumper.

SOURCE: My cooling fan has no power even when wired directly to ignition.

you can test ur fan with running" leads" or wires. a + and- from fuse box straight to fan wires, putting a on and off switch in between. its to check is fried or not. switch in line really not needed but it works

SOURCE: AC not running in my 1998 Jeep Cherokee. Changed

Hello, You have two switches which work off the pressure of the Freon. Both of these switches cut off the power to the compressor. One is for HIGH pressure and the other is for LOW pressure. Check for power at the compressor clutch connector harness while the controls are set and the engine is running. You may have power and a bad clutch.

When you say that the Freon pressure is good, does that mean the pressure is within the proper range? Too much Freon will make the HIGH switch cut off power and too little will make the LOW pressure switch cut off power.

The ideal amount(ozs) of Freon is what is recommended by the Manufactuer and it will provide a moderate amount of pressure of about 35psi-40psi. You can borrow pressure gauges, called Manifold gauges to measure your system at autoparts stores with loaner programs.

The low pressure side of the system is the one you use to induce the Freon to go into an empty system. You can bypass this switch by taking off the connector and putting a "U" shaped jumper into the harness and the compressor clutch should get power to LOCK up all of the time.

You can take off the switch connector at the compressor clutch and then check for power when bypassing the HIGH pressure switch if the LOW pressure switch does not make the system get power. Only, really only bypass the HIGH pressure switch with the clutch connector disconnected. The HIGH switch is there to prevent damage to all of the components from seals to lines to every piece of Freon hardware in the car. Bypassing with the A/C clutch disconnected will allow you to know if power is getting to the compressor clutch.

Finally, you can get FREE wiring and fusebox diagrams through Autozone.com. Just sign and register to their site and then you can print the documents for yourself.

Good luck with this repair and I hope my solution helps you.