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Discussion Starter · #1 ·
It's not so much of a big deal since i just open the windows but I would like to know why it is that my A/C stops blowing cold air while I'm on the highway for awhile or simply on the road and I have been using it for awhile. Its got freon and one time I tried that bump the compressor clutch because it wasnt turning and it worked and the other time it didnt work. I stopped doing that cause it got annoying but what would I have to do to always have A/C not whenever my car feels like it. its an 89 5.0, stock except for flows.
 

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Whats the A/C charge read?

It could the the Low Pressure switch.
It could be the A/C wide open throttle relay.
Could be a bad connection some where.

But you need to make sure the Refrigerant charge is correct.
 

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Discussion Starter · #3 ·
When I took my car about a year ago to get the A/C checked out the guy said it only needed freon so he hooked it up and it worked great. Shortly after it started with this problem. Assuming the charge is good....
Where could I find the A/C wide open throttle relay? What connections could I look for that could be bad connections? Im assuming the low pressure switch is on the accumulator which cycles the clutch, I think that one was good
 

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A/C wide open throttle relay is on the passenger side inner fender in the engine bay. The low pressure switch in an the accumilator.
check those connections first. Relay is hard to actually check. So it may just need to be replaced.

For the low pressure switch. Just unplug it and make a jumper wire to connect the two terminals on the harness connector, go drive it and see if the A/C cuts off. If it does, then its probably the relay I mentioned.

Thats assuming the charge is still good.
 

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Discussion Starter · #6 ·
Hey 89coupe I was just wondering, in the latemodel restoration site it says that the wide open throttle relay is also the fuel pump relay. I'm looking at oreilly also and I wanted to know if I could buy a fuel pump relay from them or any other parts store and use it as the wide open throttle relay? Any precautions? Pins that are not right? Amperage ratings?
 

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Look ata dia see if the dia for the two relays are the same. Some close on ground some on pos. Some open one circuit when it closes another, some have two circuits and only one works when grounded. ETC.
 
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