My A.C.compressor locked up.so I"m changing the whole A.C. system in my 1998 Jeep Cherokee 4.0 I have already removed everything,accept evaporator.How do you remove the evaporator from the cab?CAN YOU SEND A DIAGRAM?If your not able to send a diagram don"t answer.And when I put every thing back, should I put peg Iol in the system or in the compressor?
Country: United StatesMake: JeepModel: CherokeeYear: 1998Engine: 4.0
took out all components.accept evaporator.there were lot of metal in hoses.
Hello, welcome and thanks for asking your question. My name isXXXXX am a Certified Auto Technician with 25+ years experience. I will do my best to assist you. I don't know your automotive experience level, so I may have to ask questions of you before I can answer. I only know as much about your concern as you have stated in your post, so please feel free to add as much detailed information as possible.
I have the procedure for you, it has some illustrations also:
Evaporator Replace - Click here to view
Let me know if you need any clarification or additional information... Thank you...
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I have aceppted your answer.thanks a lot for your help.
Cool, Thanks, XXXXX XXXXX you need additional info, don't hesitate to ask....
hey robert ive change all the ac components, now i just need to charge it, when i pull the vacuum how long do i pull it for and does the car have to be on when i pull the vacuum? also how much freon do i put in and what is the pressure suppose to be? which side do i use to pull te vacuum and which side do i add the freon on? please help thank you
Ok, when you pull a vacuum, the longer the better, especially if it's humid in your area. If so, I recommend pulling a vacuum for at least 60 minutes, It doesn't matter what side you pull the vacuum from. Car must be OFF when pulling a vacuum....
The refrigerant capacity is 1.25 lbs (1lb 4 oz). When you are charging it, you will charge it through the low side with the engine running ac on max air. I recommend adding refrigerant by weight to be sure the proper mount is installed...
Normal pressures actually depend on ambient temperature, so it will vary some but around 85 deg farenheit, you should see 30 to 40 psi on the low side and 175 to 250 ish on the high side, of course this depends on your ambient temperature.
If you need additional information, don't hesitate to ask, I am happy to help until your concern is resolved.
ok, what does at freon by weight mean? because the only way im able to add the freon is by the can i buy at the auto store.
ok, what does at freon by weight mean? because the only way im able to add the freon is by the can i buy at the auto store
Ok, You need to look at the can, it will have the net weight labeled, most cans are either 12 oz cans or 16 oz cans. (16 oz = 1lb) so you will need to actually weigh the second can with a scale while charging to be sure the correct amount is installed, If the cans are 16 oz you would add 1 can and 4 oz out of the other can, so you would have 12 oz left over after charging if both cans were 16 oz cans....
Hey Robert i charged the AC system like you said i pulled a for an hour then put 1lb 4 ounces, as i put the first can of freon the AC was cold at 60degrees, but as put in the second can it got warmer it went up to 80 degrees. Why is this happening?
What weight are the cans that you purchased, and did you replace the expansion valve when you replaced the a/c system?
Yes i replaced every thing and the cans are 12 ounces, i didnt put the whole secondcan in
There should be a label under the hood for refrgerant capacity. Double check the label to see if it is the same as the amount that I told you to put in...
Do you have a Gauge Set? What are the pressures reading after adding the refrigerant?
It is exactly the amount you said, 1.25 and the low side was 40 and the high side was like 245
Did the condenser fan turn on during any time while the a/c compressor was on?
Have you driven the vehicle yet?
Yes the confessor fan is always on if the AC I'd on and yes i drove the vehicle no difference
Someting is not right, the pressures are a bit high, we need the low side around 35, the high side around 225, Have you made sure that the HVAC blend door is working properly?
feel the a/c lines at the evaporator, let me know if they are cold or hot, or one hot and one cold...
Try letting out a small amount of refrigerant to see if it gets better....
the low side is cold the high side is hot what could be going wrong?
I'm thinking that you have a problem with the blend door, have you tried switching back and forth from cold to heat to see if the blend door is moving, if the blend door is not moving all the way to cold, it could be blending in some of the hot air from the heater core. I recommend checking the blend door operation....
Also, I need to know, Did you replace the liquid line?
Yrs i bought the liquid line new from the Jeep Chrysler dealer the blend door seems to be opening fine i open by hand from the handle where the cable goes
Ok, That is good, because the expansion valve (orifice tube) is in the liquid line...
So strange... Was the a/c system in a vacuum when you started charging the system, If there's air in the system it can cause problems....
i don't think so, what should i do? What are the odds i put to much oil in it, would that cause it not to blow cold? Also the low side is reading like 46 and the high side like 250 should i let a little more freon out?
If there was air in the system, you will need to evacuate it again and recharge it again, it must be in a vacuum when starting to add the first can of refrigerant.
Too much oil will DEFINITELY cause this problem also, how much did you put in?
If you already let some out, letting out more likely will not help, you will likely need to start again and make sure of the proper amount of oil in the system also....