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#1
11-10-2003, 04:30 PM
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Heater Question(s) 1985 300TDT
I had no heat when driving on the freeway, some around town. Heeding the advice posted on this great forum, I checked the monovalve (bad, installed new kit), now have heat at speed
 . Also, checked auxiliary heat pump, not running Checked for power with my trusty DMM, have power. Checked thru the motor, no reading I guess I am lucky as I have read where a shorted pump motor takes out the ACC. My question is, has anyone rebuilt the pump motor or is it a "sealed" unit or is it not worth the effort and just replace it? Thanks Jerry
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Jerry - If you don't learn something new every day, you aren't paying attention!! 1971 108 280SE 2.8 "Ronnie" 1985 300TDT (76,904 Original miles  ) "Sadie" (Sold-went back to Arkansas)1984 300DT "Green-go" (Sold) 1984 300DT "Silver Bullet" (Sold) 1956 220S Ponton 1985 300D (Sold) 1984 300D 
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#2
11-10-2003, 05:13 PM
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I took mine apart to try to fix but I found it had gotten water inside and the corrosion made a repair hopeless. It's not hard to take apart so it might be worth a try. Maybe you'll get lucky and find a simple problem. Given the downside potential if it shorts out I'd suggest you wire in a fuse while you're at it so at least you'll have a bit of protection in case your repair proves to be "temporary."
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LRG 1987 300D Turbo 175K 2006 Toyota Prius, efficent but no soul 1985 300 TDT(130K miles of trouble free motoring)now sold
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#3
11-10-2003, 10:23 PM
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I have the same problem. PLENTY of heat around town. but on the highway, it's almost as if the cold wind overwhelms it.
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1995 E320 Sportline Wagon "Bernard" black on black leather http://i.imgur.com/BdZ7jM3.png
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#4
11-11-2003, 10:17 AM
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LRG - thanks for the reply and suggestion re an inline fuse.
Eric - when I pulled the top off the monovalve the problem was apparent, the small diaphram was torn loose from the piston. Very easy fix Question - does the 240D have the same auxiliary pump? I have access to some 240D's but no 123's. I would pull the pumps and check on the bench for excessive current draw, I believe someone posted here the pump motor should draw no more than ~2amps? Thanks as always Jerry
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Jerry - If you don't learn something new every day, you aren't paying attention!! 1971 108 280SE 2.8 "Ronnie" 1985 300TDT (76,904 Original miles ) "Sadie" (Sold-went back to Arkansas)1984 300DT "Green-go" (Sold) 1984 300DT "Silver Bullet" (Sold) 1956 220S Ponton 1985 300D (Sold) 1984 300D
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