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Old 01-02-2002, 10:35 AM
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Post No Heat on 85 380SL

I am getting no heat on my 380SL. The water temp never gets above 80. Any suggestions. Thanks.
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Old 01-02-2002, 10:25 PM
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Join Date: Dec 2001
Location: Chicago
Posts: 100
Same problem here, not sure if same cause

Post Heater does not work when cold

Still not fixed, my temp never got to 80, I replaced the thermostat. Now it does but still no go on the heat. I am told so far it is the "DUO" but I don't want to spend the $436 until I am sure it is it and not any other parts.

I would think if your front defrost works but blows cold air all the time it may very well be a thermostat. Since I was told once that the front defrost should work in any case.

Good Luck
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Old 01-03-2002, 06:02 AM
Neil Eglintine
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Mercs are the only cars I've owned that tend to run cold when the thermostat fails. A 380SL and a 190E both suffered this way and a new 'stat fixed both. Cheapest first step possible.

Next, the fan. If I remember correctly, the 380 has an engine driven fan. These can fail by losing drive in the clutch, or locking up. If it locks up, it will over cool.
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