2000 jeep cherokee no power to clutch or low side

On the 2000 Jeep Grand Cherokee the # 15 fuse is the IOD circuit. (Ignition Off Drain) The # 12 fuse is the power windows. Both fuses are 50 amp.

This IOD fuse #15 powers the distribution box that contains the 50 amp fuse. Pull each fuse in the under hood.

Pull each fuse in the under dash. Check for on the passenger side floor is an additional fuse panel.

Before going to far suggest at night checking for any lights lit. The draw is about right for a small light bulb.

Typical draw for parked car is around 100 milliamps

Suggest that you disconnect power to the car for several minutes. Reconnect the battery. The object is to reset the body electronics module.

If the computers in the modules get a glitch they can cause a drain. By cycling the power, disconnecting battery, they will reset to factory settings. Reported it can take up to 20 minutes for the circuits to drain before you can reset!.


The Jeeps have several modules that can cause a drain
Jeep Grand Cherokee WJ Electronic Control Modules

the following web site does a great job of explaining all that is going on. What appears to be simple to troubleshoot is not so easy. He comments about delay before sleep are important. Testing after overnight may result in a different drain rate. Make sure that your battery meets specifications. In 2000 the drain rate may be relatively high and the reserve capacity of your battery low.
http://www.tomorrowstechnician.com/parasitic-drain-ii-jeep-grand-cherokee
Hope this helps?

Low pressure switch or clutch switch if assuming clutch is not engaging when cold air is not being supplied.

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.

Check out your relays.

Most cars have to pass the compressor clutch power through a relay, and it sounds like that may be your issue.

You need to check the compressor, it sounds like the unit is low on gas. You can try to clean the filter that should be situated behinf the cubby hole on the passenger side. It should be a cartridge filter that you can pull out.

there are 2 fuse boxs on the jeep cherokee. the passengers side fuse box is located at the lower right kick panel. on passengers side. near floor board. there is 1 under hood, facing from front it is on right side near right fender. it is a black box with snaps or clips. have a good day !!

Capacity is aprrox 1.75 lbs with proper gauge (28 ozs). Leak points are many, low side port ,high side port, high and low cut off switches,evap inlet,compressor manifold,condensor inlet and outlet...to name a few.

Your clutch is not being energized - ergo the compressor will not run - no AC. Get yourself a schematic so you can intelligently trace all of the wiring to your clutch and locate the source of the problem. Afterthought - check out the thermostat setting? That is in series with clutch winding and .............................

the low side is the smaller valve, and should have a blue cap on it... if not, look for 2 black capped valves, and the smaller on it is the low side.... the larger is the high side... hope this helps you....

Hello;
Check your inlet air temp snsor for tolerance. It is showing low input. It is usually located in the air inlet tube between the air filter and the throttle body.
RPM Northwest