Heater blowing cold air... help

MN250R

Member
Hello,
My 1993 mazda protege blows cold air when your moving , but when you let it idle it blows hot or when you come to a stop light. I just changed the thermostat to a 195 and the antifreeze in the radaitor is full. The temp outside is only like 25-30 degreees out.

Is someting else failing? Heater core? or am i overlooking something

Thanks
 
If you've put in a new thermostat, then it's probably the heater core. Make sure your hoses are clear, best to just install new ones, as well...
 
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