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#1
12-10-2007, 03:21 PM
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Heater works great, but...
after a few minutes, (sometimes), it starts blowing cold air. I adjust the thermostat wheel to cold and then back down to hot and it starts blowing hot again! Sometimes after a few minutes it will do it again?? It always blows hot air after I spin the wheel..but it can be annoying.
Any ideas as to what my problem is? Thanks. 1982 300td 
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#2
12-10-2007, 04:43 PM
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Could be a CCU problem, may need to pull and check for cold solders.
__________________
83 SD 84 CD
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#3
12-10-2007, 05:11 PM
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I would take a look at the monovalve and see if the diaphragm is torn before I tore into the CCU. It could be sticking closed.
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#4
12-10-2007, 06:47 PM
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Hot with a transition to cold is classic monovalve torn diaphragm. It allows some water through so it gets hot, but can't keep up enough flow to keep it hot with increased airflow. Check the monovalve....
__________________
-diesel is not just a fuel, its a way of life-  '15 GLK250 Bluetec 118k - mine - (OC-123,800) '17 Metris(VITO!) - 37k - wifes (OC-41k) '09 Sprinter 3500 Winnebago View - 62k (OC - 67k) '13 ML350 Bluetec - 95k - dad's (OC-98k) '01 SL500 - 103k(km) - dad's (OC-110,000km) '16 E400 4matic Sedan - 148k - Brothers (OC-155k)
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#5
12-10-2007, 06:52 PM
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Yes, much easier to check the mono valve. On the firewall passenger side, a hose or two, a plug also. Two screws, top comes off, inspect.
__________________
83 SD 84 CD
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#6
12-10-2007, 06:59 PM
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Quote:
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Hybrid Mode
