Hello I am having some diff figuring this out. I have a 1994 Checvy 4x4 Sub with front and rear Air. the rear air is not cooling and I have put Freon in it at the front by the accumilator and the rear isnt getting anycooler. is there a T.X.V Valve or Piston or something I can check my self??
to see if or even why the freon may not be getting to the Back its almost like it is on Fan only butthe front is Cooling its *** off. Thank you for helping me
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Re: Rear A/C Not getting Cool
The first thing that you will need to know is if the system is charged(with freon) to the proper level. The reason for this is if the system is not completely charged, then the rear a/c will be the first not to work properly. The next thing you need to do is follow the a/c lines all the way to the rear of the vehicle. You may need to remove one of the rear interior panels for the next step. Here you will need to follow the A/c line to a little box or valve, this is called an expansion valve. The expansion valve is actually what sprays the freon into the evaporator, and creates the cold. If the line in between the valve and the evaporator os not cold, then you will need to replace the expansion valve. To do this you will need to remove the freon before you replace the valve. This is a common problem, because the valve contains a small screen that will stop up with trash and will restrick freon from flowing into the evaporator. Let me know if you need any further help.
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I know what they did!, and the only thing you can do is take it back to the dealer. They have put in a different diff ratio. jack up one side of your car with 4X4 rotate your wheels your front diff goes 5 revolutions and your rear may turn 4 or 6 turns, when your wheels turn at different rates it increases the load on your drive line, if your wheels don't slip you must break something
I would look at the u-joints before looking at the Tcase. Lift the front end (both wheels) off the ground at same time, crawl under and shake the front drive shaft. up down side to side. If it's tight the let front end down and get the rear end up in the air (both wheels) off the ground and do the same this to the main drive shaft. If the rear U-joints are failing (closest to the read Diff) take a real good look at the Diff. Make sure it's not leaking fluid, If it is you may have a bad pinion starting to go out also.
If you still get cold air out of the rear vents but the front only blows hot air you may have a bad temp door actuator in the dash, it may be stuck on hot and not able to move to cold air. However if you are low on freon with a truck that has front and rear ac then there will be a temp diff between the two. If it is hot air out the front like the heat is on then you have that actuator problem but if it is cool air about the same as the outside air temp then you may be low on freon.
Constant howl....usually wheel bearing. Howl on acceleration.......usually rear pinion bearing (the bigger of the two on the pinion) in the diff (rear axle) Howl on de-acceleration....the front (smaller) pinion bearing in the diff.(rear axle)