thermostat issue

Hi,

I recently noticed that if the outside temp is around 50 and I set the thermostat at 70 it still blow cool air and only after i move the thermostat >80 that it start blowing hot air that was expected since i checked with external themostat and car temp was cold. This only happens in winter and in summer it works fine and correctly operate the A/C and keep the car temp as what is set in thermostat. what can be the possible issue?

Thanks
--rubs

Hi,

I recently noticed that if the outside temp is around 50 and I set the thermostat at 70 it still blow cool air and only after i move the thermostat >80 that it start blowing hot air that was expected since i checked with external themostat and car temp was cold. This only happens in winter and in summer it works fine and correctly operate the A/C and keep the car temp as what is set in thermostat. what can be the possible issue?

Thanks
--rubs

...w/o car history one could only guess between a squirrel nest inside the heater and a ctrl wiring contact problem, latter most common.

First and simplest: Is the coolant liquid level ok? Air bubbles thoroughly bleeded out?
I quess the problem could be in getting heated coolant flow started through the heater core.
Check this & links http://www.cardomain.com/ride/748507/7
Check also vacuum (=power) hosing to the heater valve; can be sticking due to myriad reasons (cracked hoses - inadequate vacuum).