My son has an a/c that will not work. The pump was replaced when the bearing went out, it has the correct charge but will not run. The back up lights, electric radiator cooling fan, and pollution controls are also experiencing problems. He has replaced the main computer. He thinks this all started about the time the electric fan did not shut off when the jeep was turned off. The fan has not worked since that time.
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Re: 99 jeep cherokee xj air conditioning
The fan relay may have went bad...if the fan doesnt come on the compressor will shut down because of excessive pressure...has he used a test light to check all the fuses under the hood and inside... pay particular attention to fuse 10 in the inside fuse box...if there is no power at all to that fuse it may be in the ignition switch
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Since you are doing a rebuild, There is a tool made just for changing the cam bearings. If you are going into it that far, it is VERY worthwhile to have the block boiled and then replace the welsh plugs (freeze plugs) as well as the cam bearings. Jeep blocks tend to rust up inside the water jackets and accumulate crud in the oil passages. As long as you are doing that, do it right!! Most machine shops charge very little to replace the cam bearings especially if they do the boil out for you. Unless you can rent or get the bearing tool cheaply, it's worth having that done.
First, if the noise is from the upper part of the engine and is more of a tapping than a knock, likely you have a problem in the valvetrain, most often a bad lifter or worn rocker arm. If the noise is low, deep inside, the noise is from a bearing. This is generally accompanied by lower than normal oil pressure. Regardless of the underlying cause, correcting the cause will not stop the knock. To do that correctly, the engine needs to be removed and all crankshaft bearings and the crankshaft itself need to be replaced (crank can sometimes be "undercut" and thicker bearing shells can be used depending upon the amount of wear.) If caught very early, sometimes only one bearing can be replaced in-car, but in 99% of all cases I have ever seen, most will fail again, sometimes more severely if done this way.
sounds like the clutch field on or bearing on the front of the compressor went bad take a closer look at the pulley on the comp. and see if there is any debris or melted plastic coming out behind the pulley,if so the clutch,field and bearing should be replaced,hope this helps