1994 940 evaporator replacement
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1994 940 evaporator replacement
Guys,
Could someone help me determine whether to tackle this job or carry it to a Volvo shop?
Ac has a leak in the system and so far have not been able to locate it. Topped the Freon off the last time and it lasted from a Sunday afternoon to Tuesday afternoon. Time before that, lasted about two years but seems as though the leak has gotten worse. LS pressure runs around 55 PSI when it is working properly.
Inspected all parts Lines, compressor, condenser and fittings and found no oil residue. Checked all with bubble solution and no leaks detected. Have ordered some Freon with UV dye and a Black light to test with. If still no leak is found this way evaporator is all that is left. Unable to find any info on how to remove the evaporator. Has any one on the forum replaced theirs in a Volvo 1994 940 Sedan and can give me pointers. Thanks in advance.
Could someone help me determine whether to tackle this job or carry it to a Volvo shop?
Ac has a leak in the system and so far have not been able to locate it. Topped the Freon off the last time and it lasted from a Sunday afternoon to Tuesday afternoon. Time before that, lasted about two years but seems as though the leak has gotten worse. LS pressure runs around 55 PSI when it is working properly.
Inspected all parts Lines, compressor, condenser and fittings and found no oil residue. Checked all with bubble solution and no leaks detected. Have ordered some Freon with UV dye and a Black light to test with. If still no leak is found this way evaporator is all that is left. Unable to find any info on how to remove the evaporator. Has any one on the forum replaced theirs in a Volvo 1994 940 Sedan and can give me pointers. Thanks in advance.
no mo volvo
Joined: Oct 2010
Posts: 11,289
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From: 37 North on the left coast
you probably have to remove the whole dashboard and center console to get at it. very advisable to take your time, take lots of photos, label everything, keep all the bolts organized, so its easier to put back together.
I'd strongly consider replacing the heater core while you're in there, as it also can fail with age, especially if the car hasn't always had good coolant/antifreeze in it that was changed regularlly.
I'd strongly consider replacing the heater core while you're in there, as it also can fail with age, especially if the car hasn't always had good coolant/antifreeze in it that was changed regularlly.
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Junior Member
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you probably have to remove the whole dashboard and center console to get at it. very advisable to take your time, take lots of photos, label everything, keep all the bolts organized, so its easier to put back together.
I'd strongly consider replacing the heater core while you're in there, as it also can fail with age, especially if the car hasn't always had good coolant/antifreeze in it that was changed regularlly.
I'd strongly consider replacing the heater core while you're in there, as it also can fail with age, especially if the car hasn't always had good coolant/antifreeze in it that was changed regularlly.
no mo volvo
Joined: Oct 2010
Posts: 11,289
Likes: 109
From: 37 North on the left coast
only 'shop manuals' I've seen are the Volvo greenbooks, no longer for sale, from the factory. you can get a DVD full of them for a particular model series (there's one for 9xx, another for 7xx, and one for 2xx), but I honestly don't know if they have anything on taking the dash out to replace the evaporator or heater core, I mostly look at the electrical and LH 2.x greenbooks.
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"1994 940 evaporator replacement" update
Well hello again;
Thankfully did not have to take the dash completely out.
Turned out not to be the evaporator core after all. Had to replace AC control unit in the dash. It was not putting out the proper voltage to operate the low pressure switch, Therefore the compressor would not run. Now bear this in mind, I had just re-charged the system and it was working ok and turned the unit off when I was parking. When I got back to the car and tried to turn it on no cool air which caused me to make an assumption, ( and everyone knows what happens when you assume anything) sooo after some voltage measurements and some Ohm readings decided what the problem was and ordered a new one and replaced it, been working ok ever since. Little pricey for the part but did not want to go through tearing the dash apart again.
Again thanks for all the help and have a good day.
katman104
Thankfully did not have to take the dash completely out.
Turned out not to be the evaporator core after all. Had to replace AC control unit in the dash. It was not putting out the proper voltage to operate the low pressure switch, Therefore the compressor would not run. Now bear this in mind, I had just re-charged the system and it was working ok and turned the unit off when I was parking. When I got back to the car and tried to turn it on no cool air which caused me to make an assumption, ( and everyone knows what happens when you assume anything) sooo after some voltage measurements and some Ohm readings decided what the problem was and ordered a new one and replaced it, been working ok ever since. Little pricey for the part but did not want to go through tearing the dash apart again.
Again thanks for all the help and have a good day.
katman104
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