My 1986 244GLhas that ailment, too. Here in Houston, relatively moderate climate, it is not a problem for me.

Another technique, additional to Sven's pa, is to vary the air between outside and recirculating. Outside, of a cold day, should get things a little cooler.

If you just can't stand it, a new water valve is the only solution that I know about.

Good Luck,

Bob

:>)

My '86 240 did that. I didn't want to fix it/get it fixed so I would slide it fully off or slightly on every minute or two. Drove my wife nuts. That method worked pretty well if conditions were such that I could keep all air vents closed, with just some heat seeping through into the cabin.

I think the problem has to be the valve. Take a look at fcpgroton.com for replacments; their listings are more informative than most. Should be part of their heating/cooling section.
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Sven: '89 245 NA, 951 ECU, open-front airbox, E-fan, 205/65-15's, IPD sways, E-Codes, amber front corner reflectors, quad horns, tach, small clock. Wifemobile '89 245 NA stock. 90 244 NA spare, runs.