I've checked the forum archives and can't find an exact match for my '92 240 symptoms. The temperature is always hot regardless of the slide switch position and whether the air is directed at the feet, defrost or through the I/P vents. I don't think its related, but last winter I had the thermostat replaced but it was cold then and didn't really notice the continuous hot air problem.

Should I try replacing the heater control valve which I understand is near the accelerator pedal behind the center console.

Thanks for any help.