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Old 04-02-2003, 08:03 PM
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mj_sid mj_sid is offline
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Join Date: Mar 2003
Location: San Jose CA
Posts: 146
80' 300SD Heater Valve

Hello All,
The heater valve in my 1980 300SD was bypassed before i bought it. I was reading the posts here on why my heater was always blowing hot air and discovered the bypass. I am planning on going to pick n pull to get a used valve, but have a few questions about replacing the unit.
1. The vacume lines (im assuming they are vacume lines) at the top of the unit look hard to put on/off. One of them on my car is off and i couldnt put it back on. Does anyone have any suggestions on what im doing wrong.
2. I understand i need to check the bellows on the new valve, is there anything else i should look at?
3. Any other suggestions, comments, ideas would be greatly appreciated.

Current Stable:
1987 300SDL
1980 450SEL

Out to Pasture:
1982 300D KIA (Rice Rocket vs. 123: He hit me at 80-100MPH I walked away he went to the hospital. Sounds fair to me!)
1985 300D EURO Scrapped (got more money from state than car was worth)
1979 & 1980 300SD Great Cars!
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