AO Silver Member
Join Date: Mar 2003
Re: temp/heater temp.
Your thermostat is probably sticking either failing to close completely but still partly operating, or fully open all the time.....from your description it still seems to be partially operating.
If it has failed, replacement is the only solution...In the warm weather you would not notice one that was failing to close properly. Longer warming up will hurt fuel economy and over a period of time increase engine wear.
Its just a pain that these jobs are noticed when its coldest.....so have to be done in the winter.