No more cold A/C
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Laughing Gas
Joined: Oct 2005
Posts: 1,226
Likes: 42
From: The OC
No more cold A/C
93 3.0, 115,000. R-134 changeover about 2 years ago.
Thank goodness it is cooling off, but when summer rolls around I want to be ready.
After a recent refill/topoff to A/C with R-134, seemed like pressure was a little high. About a week later, my daughter heard a pressure relief sound and saw what appeared to be a whiteish smoke or steam spray come from under the glove box area and the A/C no longer blows cold. Like I said, I have about 6 months to worry about this. I have read about pressure relief valves getting stuck, but are they in the area of the glove box? Could a line be bad?
Thank goodness it is cooling off, but when summer rolls around I want to be ready.
After a recent refill/topoff to A/C with R-134, seemed like pressure was a little high. About a week later, my daughter heard a pressure relief sound and saw what appeared to be a whiteish smoke or steam spray come from under the glove box area and the A/C no longer blows cold. Like I said, I have about 6 months to worry about this. I have read about pressure relief valves getting stuck, but are they in the area of the glove box? Could a line be bad?
Elder User
Joined: Aug 2003
Posts: 624
Likes: 0
From: Houston, TX
Originally Posted by lv2race
93 3.0, 115,000. R-134 changeover about 2 years ago.
Thank goodness it is cooling off, but when summer rolls around I want to be ready.
After a recent refill/topoff to A/C with R-134, seemed like pressure was a little high. About a week later, my daughter heard a pressure relief sound and saw what appeared to be a whiteish smoke or steam spray come from under the glove box area and the A/C no longer blows cold. Like I said, I have about 6 months to worry about this. I have read about pressure relief valves getting stuck, but are they in the area of the glove box? Could a line be bad?
Thank goodness it is cooling off, but when summer rolls around I want to be ready.
After a recent refill/topoff to A/C with R-134, seemed like pressure was a little high. About a week later, my daughter heard a pressure relief sound and saw what appeared to be a whiteish smoke or steam spray come from under the glove box area and the A/C no longer blows cold. Like I said, I have about 6 months to worry about this. I have read about pressure relief valves getting stuck, but are they in the area of the glove box? Could a line be bad?
There are no A/C connections inside the cab. If the spray occurred inside then your evaporator core has sprung a leak and needs to be replaced. The connections to the evaporator are under the hood near the firewall. If the spray happened under the hood it would most likely be the pressure relief valve on the compressor. This is located on the back side of the compressor, and any discharge would be directed in the direction of the glove box, but under the hood.
Klaus Cook
Houston, Texas
Post Fiend
Joined: Apr 2005
Posts: 5,720
Likes: 5
From: Washington state
pull fuse to A/C clutch to disable the compressor until you get the system fixed.....if evaporator has blown? the lube is gone from the system and is not circulating thru the pump....pump will hammer itself into dust with no oil
Elder User
Joined: Aug 2005
Posts: 996
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Not to worry about the fuse. If charge is lost, compressor will be shut off by the pressure switch.
There are no connections inside the van but if the evap blew, I would expect fog and refrigerant to overpower all air doors and come from all outlets. My bet is a blown evaporator.
Ken
Ken
There are no connections inside the van but if the evap blew, I would expect fog and refrigerant to overpower all air doors and come from all outlets. My bet is a blown evaporator.
Ken
Ken
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Laughing Gas
Joined: Oct 2005
Posts: 1,226
Likes: 42
From: The OC
System should be empty, compessor clutch does not activate. I will check my manual to see how fun an evaporator core is to replace.
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Lead Driver
Joined: Sep 2003
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From: SoCal
The evap core is actually not that bad to replace. Since your AC is now empty, you can easily disconnect the lines leading to the accumulator and evap. Remove a few other things around that area, including the blower, for more working room, and you should be able to remove the front of the air box. You will have to remove a bunch of screws from around the perimeter of the box, and some of them are rather hard to reach. The evap core should be just sitting there.
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Elder User
Joined: Aug 2003
Posts: 624
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From: Houston, TX
Originally Posted by xlt4wd90
The evap core is actually not that bad to replace. Since your AC is now empty, you can easily disconnect the lines leading to the accumulator and evap. Remove a few other things around that area, including the blower, for more working room, and you should be able to remove the front of the air box. You will have to remove a bunch of screws from around the perimeter of the box, and some of them are rather hard to reach. The evap core should be just sitting there.
Klaus Cook
Houston, Texas