Thank you for all your replies and for sharing your knowledge! I will try all of these tips and report back here.

Brad

Sorry, I didn't explain my problem correctly. Below 30°F OA temp, nothing works nor do any climate control lights come on (except the background lights). No heat, no defrost, no fan, no nothing. As soon as the car warms up, the lights come on and the heat and/or defrost works and the fan starts. The...

I have had this 98 XC70 for about 7 years with no real problems except for bad front axle bearings, worn struts, the A/C clutch needing to be shimmed, the ABS module needing soldering, etc. It has about 157,000 miles on it. Last winter, when the outside temperature dropped below 30°F and the car had...