I've adjusted the heater control cable to eliminate hot fluid passing thru on previous bricks (89 and 91) but my daughters's '93 system looks different. The control cable to the heater valve is less accessable. looking at my Bentley I see a notation that it is different ..... Any adjustment possible? Any problem clamping the hose to kill the flow until next winter? Thanx guys

searched the archives and the only adjustment mentioned is a torx screw on the backside of the valve.

i have a 93 with the same issues, and thats all i found in the archives as well. unfortunately, that torx screw adjustment is for the old style heater control valve. The only stuff i saw on ours was a well documented replacement of the old style with a new style (like ours.) Don;t know if these can be adjusted, and not sure how to verify that it is working/not working without pulling the whole thing out. (do not want)

Hi there,

To verify if any heater control valve is closing, you need only feel either inlet or outlet hose. If the valve shuts off, there will be no flow, therefore no heat brought by coolant flow. The only possible reason for it to be warm would be conduction, which would take a long time to reach that far into the cabin.

I've got lots of experience with the metal (Ranco) valve, but none whatsoever on the plastic one. From the photos in Tatra Mike's pictorial, I would guess it is a simple valve that can only be adjusted by setting the stop on its actuating cable, to make sure it is not limiting the travel.

If you find this doesn't do it, please give the defective valve an autopsy and let us all know why we should or should not use them. The Ranco valves are again affordable, after a long time of unobtainability. You have an opportunity to be a pioneer!
--
Art Benstein near Baltimore

When a clock is hungry, it goes back four seconds.

My first action will be pulling the front console panel and examining the control cable. The valve end on the '93 style doesn't appear to be adjustable, so maybe the more accessable end is. If not, I've got an expendable vise grip that will certainly stop the flow.

Well, you've got it where you can see it; I don't, but I am used to expecting cables to be adjusted by positioning the sheath in a clamp. Everything from the choke on the '51 Pontiac to my 10-speed. Has to be something, I'd think.
--
Art Benstein near Baltimore

He often broke into song because he couldn't find the key.

Turns out the '93 245 does have a different heater control valve than other 240's I,ve worked on and the control cable is not adjustable. However the cable has enough range of motion to close the valve to it's stop point, a tab which stops further motion. So apparently the valve is still allowing engine coolant to pass and heat up the interior. For sure it wasn't designed this way so it must have developed a leak. I am surprised that there is no good place to get at the heater hoses under the hood. I'd sure hate to have to change them. If one were to clamp a hose to stop the coolant flow it would be in the console next to the gas pedal. No way I'd attempt to change that heater control valve. Way too much stuff in the way.

Turns out the '93 245 does have a different heater control valve than other 240's I,ve worked on and the control cable is not adjustable. However the cable has enough range of motion to close the valve to it's stop point, a tab which stops further motion. So apparently the valve is still allowing engine coolant to pass and heat up the interior. For sure it wasn't designed this way so it must have developed a leak. I am surprised that there is no good place to get at the heater hoses under the hood. I'd sure hate to have to change them. If one were to clamp a hose to stop the coolant flow it would be in the console next to the gas pedal. No way I'd attempt to change that heater control valve. Way too much stuff in the way.

Turns out the '93 245 does have a different heater control valve than other 240's I,ve worked on and the control cable is not adjustable. However the cable has enough range of motion to close the valve to it's stop point, a tab which stops further motion. So apparently the valve is still allowing engine coolant to pass and heat up the interior. For sure it wasn't designed this way so it must have developed a leak. I am surprised that there is no good place to get at the heater hoses under the hood. I'd sure hate to have to change them. If one were to clamp a hose to stop the coolant flow it would be in the console next to the gas pedal. No way I'd attempt to change that heater control valve. Way too much stuff in the way.

I have the same problem in my '93 and am still researching before I try to dismantle things. Did you ever find a solution to this? I don't see one posted.

Thanks.

No. My last post was after my last effort. It was my daughters brick and she liked it on the warm side anyway.

Where do you get all those folksy sayings under your signature, Art?

Ron
93 245
near Brantford, ON, Can