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#1
12-16-2013, 07:28 PM
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No heat in my '79 300SD
after white smoke and a burning smell entered the cabin, the heating stopped.
The heating amplifier had burned out. Replaced. No heat. The AC Servo may have been the problem but was fixed by George Murphy of Performance Analysis in Tennessee. No heat. The secondary electric water pump may have been at issue. Replaced. No heat. Vacuum works to the locks ... Possibly the interior temperature sensor quit? The hoses to the AC Servo get hot ... but no heat is being transferred. When the outside temps are above 40 degrees Fahrenheit then defrost heat works but not bilevel heat. Thoughts? 
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#2
12-17-2013, 07:41 AM
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Rebuild the monovalve and check for vacuum leaks in the pots in your HVAC control. You can find a mono valve rebuild kit for about $15. And rebuild diaphragms for the for the vac pots for about $6. The monovalve rebuild is easy. The pots are hard to get to but the actual rebuild is easy also. Let me know if you have trouble finding parts.
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#3
12-17-2013, 07:43 AM
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Hmm, I was going to suggest that perhaps the vacuum connections to the temperature switch on the Servo had been disconnected but you should still get heat in Defrost and Bi-Level regardless. Is it possible you have a problem with the vacuum switches on the push button panel?
__________________
Joe ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1980 300SD - 495k miles - 'The Ambassador' ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Former Family Members 95 C280 73 280SEL 90 300D 87 300SDL (X2) 86 560SEL 84 300D 80 300SD
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#4
12-17-2013, 07:51 AM
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Quote:
__________________
Joe ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1980 300SD - 495k miles - 'The Ambassador' ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Former Family Members 95 C280 73 280SEL 90 300D 87 300SDL (X2) 86 560SEL 84 300D 80 300SD
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#5
12-17-2013, 08:15 AM
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Does the blower motor still work? It sounds to me like something burned out.
__________________
"Senior Luna, your sense of humor is still loco... but we love it, anyway." -rickymay ____ "Your sense of humor is still loco...  " -MBeige ____ "Señor Luna, your sense of humor is quite järjetön" -Delibes1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod 2 Samuel 12:13: "David said to Nathan, “I have sinned against the Lord.” And Nathan said to David, “The Lord also has put away your sin; you shall not die."
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#6
12-17-2013, 11:18 AM
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Somewhere on the forum is a link to the service manual for the servo system. I posted it years ago but other people have posted the link too. If you can find that manual I'm thinking it would be possible to apply voltage and vacuum to the right wires/hoses independent of the push buttons to confirm that the servo actually turns and lets hot water into the core.
__________________
1977 300d 70k--sold 08 1985 300TD 185k+ 1984 307d 126k--sold 8/03 1985 409d 65k--sold 06 1984 300SD 315k--daughter's car 1979 300SD 122k--sold 2/11 1999 Fuso FG Expedition Camper 1993 GMC Sierra 6.5 TD 4x4 1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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#7
12-17-2013, 01:40 PM
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__________________
Joe ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 1980 300SD - 495k miles - 'The Ambassador' ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Former Family Members 95 C280 73 280SEL 90 300D 87 300SDL (X2) 86 560SEL 84 300D 80 300SD
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#8
12-17-2013, 04:48 PM
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If the blower motor isn't working check the hidden fuse on the firewall...
in waht sequence did you replace the servo, aux pump and amp? If the amp was replaced before the aux pump...your amp is probably bad again... Did you replace the foam tube that leads to the sensor? great service info 1971 Chrysler Imperial Auto-Temp 2 Service Reference Guide - Session 281
__________________
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#10
12-18-2013, 12:30 AM
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A ball valve in place of the monovalve will solve it. But that's only convenient if the weather is consistent where you live. In Tenneessee, its rather inconvenient.
__________________
What Would Rudolph Do? 1975 300D, 1975 240D, 1985 300SD, 1997 300D, 2005 E320 , 2006 Toyota Prius
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Linear Mode
