Heater core changed three years ago,I changed Thermostat Heater still blows cool air.
Whats the problem? Blows cold air with the heat settings on?
Check antifreeze level, then thermostat next, heater core last
possibly thermostat stuck in the open position?
Try your thermostat
some possibilities are. low coolant level, open thermostat, pluged heater core,
Low coolant? Bad thermostat? Heater core plugged,restricted or airbound? Heater control cable or valve not working?
It's either the thermostat or the heater controls.
check the thermostat dude may need replacing
It sound like the thermostat is broken
You probably have a bad thermostat.
Thermostat stuck open, heater core clogged, or the heater temperture control vlalve is defective.
you have to turn it on so the heater in cjs room turns on, blows you on her bed and you get across the fan.
Low coolant, failed thermostat, partially plugged heater core...............
The most common reason the heater is blows cold air on a 1999 Ford Winstar is a bad thermostat or blocked heater core.
The heater might blow cold air in a 2000 Silverado because the thermostat is sticking and not changing from cold to heat. The thermostat is usually located in a hose that leads from the radiator to the motor.
You may be low on coolant, or the thermostat is stuck open, or the heater core is plugged up, or the temp blend door is broken.
Your thermostat is stuck in the open position. Replace the thermostat and no more problems. Quick fix and only costs about 20 dollars.
Check coolant level? Heater core plugged or restricted? Heater core airbound? Bad thermostat? Water pump not circulating coolant? Heater control cable not adjusted properly?
The heater valve may not be engaging or the heater core may be blocked.
Add coolant if it's low, change the thermostat if it's bad, and/or check for a restriction in the cooling system such as the heater core.
Check your coolant levels, and check your thermostat - it may need replacing. Also check your heater hoses to ensure they're not leaking.
The thermostat may be stuck open.