Need help with A/C - Ranger-Forums - The Ultimate Ford Ranger Resource


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  #1  
Old 04-28-2008
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Need help with A/C

Hi how are all of you doing? I tried to search for this problem and didnt see it. I am sorry if I missed something. Thanks in advanced for reading my post. I have a 1989 Ford Ranger XCab 4x4. My A/C is not working correctly. The compressor will not engage until the engine is at or above 3000 RPMs. Anything below the 3000 RPMs, the compressor shuts off and it blows hot air. If the compressor is engaged the air gets nice and cold. The fan is blowing enough air accross the condencer and evaborator. The engine is running on the low end of the normal range on the temp. gauge, so it is not over heating. All the electrical is connected, and in good shape. It is running on the R12 refrigerant, which the system has the right amount (pressure). If anyone has some suggestions I would greatly appreciate it. I have been trying to figure this out for some time, and I am getting frustrated. Thanks for all your help.
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Old 04-28-2008
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sounds like your WOT (Wide Open Throttle) AC cut-off relay is bad.
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  #3  
Old 04-28-2008
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A/C Problem

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Originally Posted by lifted97ranger View Post
sounds like your WOT (Wide Open Throttle) AC cut-off relay is bad.
Thanks for the post. I will have to check that out. But, if the WOT was bad, wouldnt the engine cut off, or run ruff when it is on full throttle? The engine runs fine, but the compressor doesn't engage until 3k RPMs. Tell me if you think it is still the WOT. Thanks again.
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Old 04-28-2008
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The A/C has a relay that cuts the A/C off when the engine is at WOT (Wide Open Throttle). It will not kill the engine, just the A/C compressor.
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Old 04-28-2008
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Thanks

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Originally Posted by lifted97ranger View Post
The A/C has a relay that cuts the A/C off when the engine is at WOT (Wide Open Throttle). It will not kill the engine, just the A/C compressor.
Oh ok, thanks for your help. I think it is located under the fuse box that is under the hood. Is that correct? If that is correct, which one of the I think 3 or 4 relays is it? Thanks
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Old 04-28-2008
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Neither of my repair manuals have the fuse box layout of a '89-'92 Ranger. If you have an owners manual, it should be in there.
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  #7  
Old 04-28-2008
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Quote:
Originally Posted by lifted97ranger View Post
Neither of my repair manuals have the fuse box layout of a '89-'92 Ranger. If you have an owners manual, it should be in there.
With the research I have done, there are three relays.
- Fuel pump (E3TB 9345 A2A)
- EEC (E3AF 12A646 B2A)
- A/C -- I don't know which one: dealer said:
- (E3TB 13A025 A2A)

Everyone on the forums said:
- (E5TZ 19D572A)

I am trying to figure out which one.

My truck had the fuel pump and EEC relays but the A/C one was missing. So, I guess you were right about what was wrong with my A/C.

IF ANYONE KNOWS WHICH ONE IS THE CORRECT RELAY I AM ALL EARS, AND WOULD GREATLY APPRECIATE IT!!!!!
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Old 04-28-2008
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heres an image i pulled off all data for your truck - top of the page it shows the cutout relay.

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  #9  
Old 04-28-2008
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the relay closest to the front is the one that I am talking about (on the left of the 3 relays under the distribution box).
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Old 04-28-2008
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i dought thats your problem. if the WOT relay is missing the compressor clutch will not engage
.
sounds like it needs a recharge. to bad its r12.

its a old system and i wouldnt expect much out of it. to get it working like it should you will need a r132a conversion kit, a new orifice tube (this is probably your problem), a new receiver/dryer, new condenser, new fan clutch and the proper amount of r134a.

if you dont know a lot about A/C systems then you may want to accept the fact you need to take it to a professional and pay to have it fixed right.


welcome to ranger-forums
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  #11  
Old 04-28-2008
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Relay missing

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Originally Posted by lifted97ranger View Post
the relay closest to the front is the one that I am talking about (on the left of the 3 relays under the distribution box).
Ya, that is the one that is missing. Thanks soooooo much for the picture, you have been a great help!!!! I just wish that picture gave the numbers, nun the less it was a great help!!!!. I am continuing to research but I am coming up with the two different relays, maybe either one will work? (E5TZ 19D572A OR E3TB 13A025 A2A). Well thanks for your help!!! I will let you know what I find out. I might just go with what the dealer tells me, as they might know more then the people on some of these forums I have been talking with, but not always the case ex. you and those minimum wage part guys, that just read the computer. lol
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Old 04-28-2008
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Quote:
Originally Posted by 04 EDGE View Post
i dought thats your problem. if the WOT relay is missing the compressor clutch will not engage
.
sounds like it needs a recharge. to bad its r12.

its a old system and i wouldnt expect much out of it. to get it working like it should you will need a r132a conversion kit, a new orifice tube (this is probably your problem), a new receiver/dryer, new condenser, new fan clutch and the proper amount of r134a.

if you dont know a lot about A/C systems then you may want to accept the fact you need to take it to a professional and pay to have it fixed right.


welcome to ranger-forums
It doesn't need a recharge. I put the correct amount of R12 and oil in the line when I recharged it. That was only a few months ago. Also an indication that it doesn't need to be recharged (i think) is when the compressor does engage it is very cold. I just recharged it, when I replaced a hose that was leaking. Yes I do still have R12 as I bought tons of it before it was no longer available. hehehe sssshhhhhhhh!!!
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Old 04-28-2008
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ok hows the orifice tube?

and if you have tons of r12 then your sitting on a gold mine and i would sell all of it then upgrade my system to r134a and have lots of pocket change left over.

nevermind me though my ASE certs mean nothing
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Old 04-28-2008
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Quote:
Originally Posted by 04 EDGE View Post
ok hows the orifice tube?

and if you have tons of r12 then your sitting on a gold mine and i would sell all of it then upgrade my system to r134a and have lots of pocket change left over.

never mind me though my ASE certs mean nothing
I don't know I have not checked it. I should have when I replaced the line, but I didn't think of it. Do you think I should replace it? It probably will help to get the relay wont it? Thanks for your help...
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Old 04-28-2008
04 EDGE
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is the compressor clutch engaging?

if it is then installing a WOT relay is going to do nothing but disengage the clutch at WOT.

i dont remember how the older systems work.

but it sounds like either you do not have a good enough charge or you have a restriction.

did you vacuum the system down before you recharged it?
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  #16  
Old 04-28-2008
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vacuum

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Originally Posted by 04 EDGE View Post
is the compressor clutch engaging?

if it is then installing a WOT relay is going to do nothing but disengage the clutch at WOT.

i dont remember how the older systems work.

but it sounds like either you do not have a good enough charge or you have a restriction.

did you vacuum the system down before you recharged it?
Ya I vacuumed the system out, and put the right amount in the system. It is running at the correct psi. both the high and the low. I am at a loss now. I think I might have to go take it to someone. But because it is R12 it is so damb expensive to do anything with it when you take it somewhere
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  #17  
Old 04-28-2008
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Help!!

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Originally Posted by 04 EDGE View Post
is the compressor clutch engaging?

if it is then installing a WOT relay is going to do nothing but disengage the clutch at WOT.

i dont remember how the older systems work.

but it sounds like either you do not have a good enough charge or you have a restriction.

did you vacuum the system down before you recharged it?
do you have any other suggestions?
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  #18  
Old 04-28-2008
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orifice tube
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  #19  
Old 04-29-2008
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yea sounds like o-tube.

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nevermind me though my ASE certs mean nothing
ASE= Ask Someone Else... lol little joke at work. a mechanic i work with is "master certified" and doesn't know ****. to me ASE means nothing more than you're good at taking tests.
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