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#1
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I'm Sweating!
Well, I was in Mexico all of last week, but that is not why I am sweating.
On the way to work this morning I had constant hot air blowing from my vents! My first thought was my monovalve gave up after 25 years. Is this the only or just the likely culprit? From my searches, it seems rebuilding is the way to go. Any recommendations? Or is my recollection of previous readings faulty and it is not the monovalve causing my constant heat? tia, Tim
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2009 VW TDI Jetta Sportwagon 172k miles (rear-ended harder than Elton John on 8/4/13. Total loss) 1991 Volvo 240 142k miles (T-boned by a stop sign runner. Total loss) |
#2
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mine does the same thing and it's because I ain't got no freon in it
I wish it were the monovalve
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'02 BMW 325i '85 300D 450k '93 190E 2.6 170k(killed by tree) '08 Ducati Hypermotard 1100S 6k '06 Ducati S2R800 14k(sold) |
#3
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Quote:
I would check your valve by applying 12 v directly to the terminals to see if you stop the hot air. I had the same problem, but it turned out to be my CCU that had gone bad, not tell the monovalve to shut off, giving me hot air all of the time.
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NC Benz Fuquay-Varina, NC 1979 300D 1983 300D Turbo 260,000 Miles 1984 300D Turbo 345,000 Miles (sons car) OBK #31 1998 Ford Expedition 5.4l (fer Haulin'!) 145,000 1973 19' SeaRay with 115 Mercury TOWER OF POWER! Club Car Golf Cart 36V Ex toys: 1967 Mustang 289 (First Car) Fiat 124TC 1975 Honda CVCC 1980 Audi 5000 Turbo |
#4
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My 95 actually shuts down as the high pressure side gets too much psi if its 90+ or if I redline the motor.
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#5
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You mention "hot air" coming from the vents.
Are you speaking of ambient air that has been cooked by the sun in the intake plenum? The temperature of the air coming out of the vents when initially started in the sun can be significantly higher than ambient. After you drive the vehicle for awhile, does the air temperature from the vents get back close to ambient? Or, are you positive that the air temperature from the vents remains well above ambient...........for an unlimited time? This is not a trivial question. You might be chasing a monovalve when it has nothing to do with the issue. |
#6
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Quote:
Brian I left for work at 0600 and ambient was about 75F. The air coming out of the vents was at least 130F and didn't quit until I turned the system completely off. A/C was converted to R134A 2 years and 15,000 miles ago and was blowing ice cold when I left for Mexico (I usually have to set the temp wheel near the white and red zone interface to keep from freezing if ambient is below 90F). The car sat in the garage unmolested while I was gone. Thanks! Tim
__________________
2009 VW TDI Jetta Sportwagon 172k miles (rear-ended harder than Elton John on 8/4/13. Total loss) 1991 Volvo 240 142k miles (T-boned by a stop sign runner. Total loss) |
#7
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Quote:
If that's good, see if the monovalve will cycle if you apply and remove 12V and ground from it. You'll hear the solenoid make a "thunk" if it's working properly. If that's good, then see if there is a ground signal from the CCU at the monovalve. That's how it closes. If no ground signal is present, then run two jumper wires to the monovalve.......one from ground and one from 12V. Now take it for a drive and see what you get. If it works properly and you have a/c, the CCU is NG. Last edited by Brian Carlton; 06-18-2007 at 02:42 PM. |
#8
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monovalve diaphragm
Quote:
Jim
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14 E250 BlueTEC black. 45k miles 95 E320 Cabriolet Emerald green 66k miles 94 E320 Cabriolet Emerald green 152k miles 85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles |
#9
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I had a fuse once break on me, and consequently received a face full of hot air. Replaced the fuse, and counted myself lucky!
There should be a pictoria somewhere on this site - or a link to one, as to how to replace a mono valve. It's pretty simple - just make sure you don't let the any parts fall off the stem, so you know how to put it back in.
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It is a truism that almost any sect, cult, or religion will legislate its creed into law if it acquires the political power to do so. Robert A. Heinlein 09 Jetta TDI 1985 300D |
#10
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Thanks guys!
I will certainly check this all out at the first opportunity. I was sweating like a hog on the way home from the office today!
__________________
2009 VW TDI Jetta Sportwagon 172k miles (rear-ended harder than Elton John on 8/4/13. Total loss) 1991 Volvo 240 142k miles (T-boned by a stop sign runner. Total loss) |
#11
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check/roll the fuses
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81 Mercedes 300SD 289k.......SOLD 82 Mercedes 300CD 252k......slow ride 82 mercedes 300 SD...mi Unknown 83 Mercedes 300D ????ksniff..gone too 84 Mercedes 300D 148k........SOLD 85 Mercedes 300TD 386k and holding some one elses project |
#12
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Fuses are all good (darn!).
Monovalve rebuild kit should be in from Fastlane tomorrow. The drive home in sunny 93F and high humidity was really fun today!
__________________
2009 VW TDI Jetta Sportwagon 172k miles (rear-ended harder than Elton John on 8/4/13. Total loss) 1991 Volvo 240 142k miles (T-boned by a stop sign runner. Total loss) |
#13
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I took the lazy way out and installed a new monovalve last night. I figured even if it isn't the valve, that puppy will be giving up soon enough regardless.
I was worried when I pulled the old valve and the diaphram was intact. Fortunately, the new valve did the trick as I am back to normal now. I guess I'll never know exactly what the failure mode was. That's what I get for being lazy Thanks for all the responses, Tim
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2009 VW TDI Jetta Sportwagon 172k miles (rear-ended harder than Elton John on 8/4/13. Total loss) 1991 Volvo 240 142k miles (T-boned by a stop sign runner. Total loss) |
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