I don't fully understand your exact problem, but if the temperature inside your car is not rising or falling by turning the temp wheel, you could have a bad temp sensor (behind dome light) or your sampler blower motor (behind right dash vent) may be bad.

If you use the EC button when heating, you'll never get truly cold air when you turn wheel to all blue, even if its frigid outside.

Do a search for "sampler blower motor" and a couple of threads should pop up.

G'luck:p

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-Paul-
'01 E430, Sport 72,000 mi
'98 C280, 126,500 mi