How cold is it where you are? How old is your car?
You might have bad connection to the coolant temp sensor.
Have you measured the voltage or duty cycle on pin 3 of the diagnostic port?

__________________
Zorin

'88 Benz 420 SEL
'79 Porsche 911SC ('87 Carrera Engine)
'00 BMW 540 Sports Package
'99 Land Rover Discovery

86 300E - Manual (sold)
88 260E (sold)
84 944 (sold)