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Old 11-24-2002, 10:06 PM
Registered User
Join Date: Oct 2002
Location: FL
Posts: 75
Heater Core problem

After purchasing my 1985 300D I found that the former owner had bypassed the heater core. After talking to him, I am still not sure if the heater core was leaking or it was another problem. He was a Greek gentleman and could not speak English very well. He lived in Miami and all he could tell me is that you don't need a heater in Miami and it was too expensive to fix. I live in Central FL and it gets cold enough here that you need a heater.

My question is:

How prone are the heater cores to leaking??? or could it be the mono valve.

Second question - Since he removed the heater lines from the mono valve, and just ran a heater hose around the back of the engine straight into the block, which direction does the water flow in? The two small fittings and out the large fitting?

Would like to try flushing it with water and checking to see if there are any leaks before I try to take the heat core out of the car.

Thanks a lot for any suggestions


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Old 11-25-2002, 12:16 AM
Registered User
Join Date: Aug 2001
Location: Evansville, Indiana
Posts: 8,150
I'm not for sure, but I believe the left hand side goes straigh to the heater core and the right hand side goes to the aux pump (by the battery) and monovalve.

Could be any of a number of things, including a bad monovalve, leaking core, or dead aux pump.

My money is on the monovalve and/or the pushbutton control unit -- if either fails, it can give full heat all the time.


1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!
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