heat turns cold when stopped in traffic or stopped for a few seconds, then heats up fine again when driving

thanks,townwrench

 

STOP DRIVING IT like last month!!!!!!!

Coolant is low somehow / someway.... You gots air in the cooling system..

Look for obvious signs of coolant leak (back of cylinder head where all 3 hoses congregate, the upper likes to corrode and leak all over the place.

Time to change coolant and thermostat while it is apart for repair...

Look at fill neck for clean pronounce ring around opening for rubber ring on cap to seal.. if it look all grainy/string/melted, radiator is toast.

Better hope you not popped the head gasket or twisted the head, if so ,,,,,,,,, buy new engine.