HI, my cherokee's A/C is working very well, it gets very cold & the fan blows great. Unfortunantly it also starts overheating the engine. It will cause antifreeze/coolant to spit out (not positive but I belive it comes out through the overflow). A guy at autozone said to check the fan switch, but my Chilton manual says nothing about A/C repair. This is the car my wife and kids ride in and we live in GA (100+ degree heat index) PLEASE HELP. Thanks in advance.
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Re: 1998 Jeep grand cherokee (Laraedo) A/C
You need to get the cooling system flushed and the thermostat replaced. The fan switch he referred to is the cooling system fan switch. When you A/C is on the computer turn on the fan constantly to help keep the engine cool under the extra load.
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You need to find out if the fan relay is good, pull the relay out for the fan and check to see if you are in fact getting voltage to the fuse/relay box at that location. But you could have a bad temp sensor, the fan would not know to kick on at a certain engine temperature. before replacing parts, it's best to find out for sure you're not losing voltage somewhere. The parts are not too expensive but no need in changing good parts. It's hard to really pin point the problem with out being there to test. Good Luck
If the air going through the evaporator at 50mph is getting cold then it's logical to assume that if the fan is not operating, the only way air can get into the vehicle is through the ac, but it cannot be blown in because that's the fan's job. If you unplugged the fan motor in your house air conditioner but left everything else intact, the only cold air going into the house would be if there was a high wind blowing through the unit.from outside. (in reality that would not really work but the concept is correct) Once the fan problem has been corrected, you may need a bit more freon added to the system but I recommend you have it checked by a professional using the proper gauges. I am not going to post this as a "fix" only because I believe that you won't accept the validity of what I've told you. But, Good luck anyhow!
This has happened to me on my 1998 Grand Cherokee for the past couple of years. It is intermittent, same problem with the a/c blowing only hot air. My mechanic said it would require taking the whole dash apart which would cost a couple hundred bucks. He said it was a baffle that was getting stuck. So now, when it happens I hit under the dash to the right of the console with the palm of my hand. It will loosen the baffle into place and then it works fine. Not only that, getting out my frustration gives me some satisfaction. :-)