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#1
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1984 w123 All heat except min setting
Hi I have a 1984 300d.
I have been working to resolve this issue for quite some time now. I get heat no matter what temperature setting is selected (except min) on the temp wheel. No modulation what so ever. -I checked the monovalve (not torn, sees varying voltage when temperature wheel is moved) -Replaced the foam tube for the dash temp sensor... can I test that sensor? I would assume the temp wheel is working correctly since the voltage at the monovalve changes when moved. Any ideas where I can go from here? |
#2
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You have no air blowing or it is not hot?
This is often a vacuum issue - may be best to post in diesel discussion group. |
#3
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I'll move the thread...
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#4
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Update.
I was getting full heat... Very hot, had to lower a window. I replaced the mono-valve internals and now I get intermittent heat all hot or blowing cold air , now it's blowing cold most of the time no matter where the temp wheel is set. Please move this thread back to the general tech page as this is not diesel specific. |
#5
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however, it's 123 specific... and 99% of the 123's are Diesel.
very little knowledge available in the Tech help section (should be named GASSER help) on the 123 controls...
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#6
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Hmm.
do you still have the original monovalve? do a search for CCU sequence, or climate control testing... I'll see if I can find it. you may want to pull the climate control out and check the solder joints for cracks. resoldering the joints repairs MANY CCU issues. also, if the aux pump is bad, it can overwhelm the CCU circuit.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#7
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Thanks for the info.
Does not look like the original mono valve the wires were cut and spliced in... I soldered them yesterday. I'll have to dive into the acc unit. Another thread mentioned the control box behind the glove box any idea how to check that if it has failed? |
#8
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here is a writeup on CCU service.
PeachPartsWiki: Climate Control Repair
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#9
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Remove the glove compartment and verify that the vacuum tube that aspirates the temp. sensor in the dash is still connected. They tend to deteriorate over time.
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'83 300D, 126K miles. |
#10
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I replaced the foam tube for the dash sensor last year. How can I test the interior temp sensor is operating correctly?
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#11
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i had this problem and replacing the unit behind the glove box fixed it.
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1981 NA 300D 310k miles |
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