schizo heater on 115 300d - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 02-03-2010, 01:29 PM Thread Starter
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Date registered: Aug 2009
Vehicle: '85 300D - 381K and increasing daily
Location: Youngstown, OH
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schizo heater on 115 300d

Car runs like a champion, but the heat is slow to work, if at all. Engine reaches normal operating temp as it should, but heat only works on the highway after about 5 minutes, or with the blower on "1" otherwise. the heater core isn't clogged and the heater valve on the firewall isn't clogged either. the water pump makes good pressure in the hoses. don't know what to make of it. i was thinking about maybe installing an electric aux. water pump from my w123 that i have lying around...

any ideas?
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