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  #1  
Old 10-17-2008, 06:43 AM
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Join Date: Oct 2002
Location: Northern California
Posts: 188
strange heat issues

At idle I have plenty heat from the vents. When I get up to cruising speed I have no heat. When I come to a stop and idle the heat returns. I have measured the voltage at the monovalve and it reacts to the temp wheel accordingly. My ACC unit seems to be functioning correctly and my aux pump works as well. Bad monovalve?

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1983 300D 280,000
1983 300TD 125,000 Killed by oak tree.
1983 240D Sold
1986 Ford F250 Diesel 6.9l 169,000
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  #2  
Old 10-17-2008, 06:56 AM
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Join Date: Mar 2007
Location: Viera, FL
Posts: 665
Monovalve is torn, get a new one...it takes about 10 minutes to replace. I believe there are a few write ups if needed in the DIY section.
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My Primary Driver - '85 300CD - 4-speed conversion, 2.47 rear, lowered, euro headlights, rebuilding (not restoring so much)

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  #3  
Old 10-26-2008, 02:26 AM
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Join Date: Oct 2002
Location: Northern California
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Thanks! Torn monovalve it was.

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1983 300D 280,000
1983 300TD 125,000 Killed by oak tree.
1983 240D Sold
1986 Ford F250 Diesel 6.9l 169,000
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