I'm working on my 87 260E to troubleshoot the cause of headaches that it's giving me while the temp control is on the heat mode.
The headache makes me open up the window while i'm driving. however the headache goes away when the temp control is shifted to cold temp and the heater turns off.
Economy mode or A/C mode, I've tested both.
here's the question: basically it's the heater that seems to cause the situation.
If it were the coolant, I don't smell any coolant.
what are some of the simple tests to find out if it's a leaking heater core ? the coolant level is full.
more over I'd like to know what additional vents from the outside into the cabin are used that are different from the fresh air mode.
thanks.

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