1984 MERCEDES BENZ 300SD NO HEAT ON BOTH SIDES

  • Tiny
  • seweavers
  • Member

The control valve is working. When we drive the car there is no heat. When we shut the car off, wait a few seconds and turn the key on (we do not start the engine) there is heat. Once the car is started, it goes back to cool.

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Monday, November 1st, 2010 AT 6:12 AM
  • Tiny
  • Dr Loot
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  • 2,332 posts

You failed to mention that the circulation pump was working. It is starting to sound like a plugged heater core, you can remove the line from a heater control valve and use your garden hose and try to blow out the heater core to see if you've got a circulation

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Monday, November 1st, 2010 AT 2:27 PM
  • Tiny
  • seweavers
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I do not have the circulation pump as shown in the picture. This pump is on my 300d that we have but not the 300sd. I can get very hot air when the engine is off.
We are getting circulation but in my opinion it may be inadequate. I beileve ther is another type of valve under the valve at the firewall. It does NOT have any wires going to it but the hoses do. Will try to bypass this to see if flow increases.
I have an 83 and 84 sd and 1 84 300d and 2 85 300sd.

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Tuesday, November 2nd, 2010 AT 8:31 AM
  • Tiny
  • Dr Loot
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  • 2,332 posts

That would change everything if it is a 300d. I have one of those in my storage lot, let me go take a look at it and I will get back to you

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Tuesday, November 2nd, 2010 AT 10:45 AM
  • Tiny
  • seweavers
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This is on a 300sd. One of the photos you had posted was not like the 300sd, it was like the 300d.

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Tuesday, November 2nd, 2010 AT 12:09 PM

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