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#1
09-14-2010, 10:26 PM
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1983 300cd wierd heater issue
Ok, I have had this 300cd since April, my first diesel benz. I charged the AC, works fine after the compressor's been running for a while. Blower works fine. All the climate control buttons work seem to function.
It's that time of year where I'm starting to think heat might be nice. So here's the wierdness. I turn the wheel to hot, select a setting. It blows hot, it just doesn't stay hot. If I push a different climate control button, super! blows hot and again doesn't stay hot. If the car's shut off, sits for a couple minutes get back in and start it, blows hot and....you guessed it, doesn't stay hot. WTF???? Anyone know what's up with this thing? Please help out a noob. 
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#2
09-14-2010, 11:03 PM
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Can the monovalve stick closed?
It sounds like it is opening and then springing shut. Maybe a PO modified it somehow. I would check that first.
__________________
----Adam 1985 300SD 322,000
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#3
09-14-2010, 11:06 PM
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A torn monovalve diaphragm can cause erratic heat issues. The typical scenario is that the heater works at slower vehicle speeds, then starts blowing cold air at highway speeds.
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#4
09-14-2010, 11:16 PM
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once the passenger compartment reaches the set temp, it will cool off a bit. if you set the fan on auto, it will reduce blower speed too. if you dial the temp wheel hotter does it warm up? my dash has a small opening in the center, i assume yours does too. there is a thermistor in it. it may not be working properly.
__________________
1984 300TD "MAX" 303K+ still going... fast '70 Chevelle 200k+ home built Shovelhead chopper
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#6
09-15-2010, 04:11 PM
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In the defrost mode, you should get full heat. this is the default mode.
as said above, probably the mono valve cartridge. Charlie
__________________
there were three HP ratings on the OM616... 1) Not much power 2) Even less power 3) Not nearly enough power!! 240D w/auto Anyone that thinks a 240D is slow drives too fast. 80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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