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Old 10-25-2018, 08:22 PM
Steve Loftin Steve Loftin is offline
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Default Comfortron issue

On my 1972 C/B with Comfortron climate control, the A/C works (converted to 134 by a previous owner) and the vents change properly when switched from A/C to heat and defrost. However, even with hot water coming in and out of the heater, there is no warm air blowing.

My mechanic has looked it over and determined that it needs a vacuum motor (perhaps a diaphragm only?) for the programmer. He supplied this diagram for reference. Can anyone here tell us of a source--or at least a part number--for this item?

Or, if there is another common fix for this problem, please share it here. I appreciate your help!
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Old 10-25-2018, 08:34 PM
Paul Steinberg Paul Steinberg is offline
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The first thing to check is if the hot water is flowing into and out of the heater core. If it is, then it might be in the programmer, but I doubt it, since the A/C is working properly. The programmer moves the doors by vacuum, and if the upper doors are open, and it calls for heat, then the heat should come out of the upper doors, through the blend door. If it doesn't then I would be looking for a broken vacuum hose.
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Old 10-25-2018, 10:55 PM
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John ED Renstrom John ED Renstrom is offline
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It is a interesting system. The big thing with it is vacuum. The system draces from the manifold to the plastic holding tank. From there it divides to the shut off valve and the controls. It goes forward to the temperature control valve which when it comes up to temp will open the water control valve in the rear. This valve has the thermal switch which when it gets hot enough will put power to the blower motor. One hose leaking will not let the system work. Depending on the spot it leaks at which set of controles work or not. You really or at least i did need the shop manual to figure it all out. There are two separate relays for the blower and the temp wheel has a thermal control on it. Contects need to be clean in the control unit . Not then at time i have to rotate the temp control all the way up to get it to switch then back down other times slide the fan / posision lever back and forth to get it to make the switch. The systen takes some playing with.

But it sounds to me like the water control valve is not working. Both hoses will be hot due to back up temps. Make sure it is opening and water can flow. New control valves are still out there I have gotten two off e bay not that long ago. But the big thing is all the lines run as the factory set them is nessary for the system to work
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Old 10-25-2018, 11:02 PM
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Chk and double chk all the vacuum lines for routing ,connections and leaks. Fixed a few of these with just one bad vacuum line.
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Old 10-25-2018, 11:47 PM
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As pointed out the whole system DEPENDS on vacume. Find where it comes off the intake manifold start checking there and follow the hose to its next junction look at each joint for vacume a minor hose kink can cause a problem as old soft hoses kink easily. The thing to remember as an engineer told me years ago"We never designed things to work after 25 years". So this is what you are up against. We fixed a Cadillac years ago for heat in the winter by running a vacume line right to the valve and you just had heat all the time.
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Old 10-26-2018, 12:16 AM
Joe Rackov Joe Rackov is offline
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Myty-Vac hand vacuum pump is helpful also. Harbor Freight sells them for around 42 bucks. They are also helpful when replacing brake lines or hoses for removing trapped air.
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Old 10-30-2018, 09:55 PM
Steve Loftin Steve Loftin is offline
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Default Update

My mechanic says I definitely need a vacuum motor and maybe the vacuum valve. Can anyone here tell us the part numbers for these items, and possibly a source?
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Old 10-31-2018, 04:14 PM
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One may have to take the valve apart and lap it in and re grease it. I cured the can't cool problem in my vacuum motor with a new vacuum line. But it could be a pen jamming it.

But i have not found a source for parts for the system. One might inquire with the Oldsmobile group. Let me know if you find one.
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Old 10-31-2018, 04:37 PM
Steve Loftin Steve Loftin is offline
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I posted the same request on the OCA Facebook page, but with no results so far.

I'm told that the complete control unit (as seen in the diagram) is readily available, but will be around $500 installed. The mechanic said that the two items circled are supposed to be available individually, but that without part numbers, he has no idea of looking them up.

Still working on it...
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Old 10-31-2018, 05:21 PM
Peter Grave Peter Grave is offline
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WE had many of the GM climate control cars in the day MOST problems were vacume lines NOT parts. Do yourself a favor don't spend big bucks for parts you may not need. Best example of what I am saying was a 66 Cadillac Convertible we sold in early 68. The new owner had it about eight months and came storming in with a "you sold me a piece of s*** the climate control stopped working and the Cadillac dealer says it needs to be rebuilt and the cost about $850.00". I calmed him down and said we would get it repaired. A quick underhood check showed nothing a look under the dash a vacume hose off on the firewall temp sensor. Hooked hose up unit working fine. Find out what is wrong don't just throw parts at it. I will bet its a hose issue. A vacume gage will tell you a lot.
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