You should check the thermostat to see if it is operating corectly, or your system may need to be perged.
either your heater control valve is bad or you heater control switch on your dash is broken pull the knob of and see if it is cracked.
Low coolant? Bad thermostat? Heater core plugged,restricted or airbound? Heater control cable or valve not working?
COULD BE A BAD HEATER CORE COULD BE A BAD HEATER CORE sounds like the heater control switch needs replacing.if that doesnt fix it, you need new heater core
Compressor not running? Check fuses, check switch
it could be your thermo stat
Heater core changed three years ago,I changed Thermostat Heater still blows cool air.
can you please clarify what you mean, do you mean that the front heater blows cold but the rear blows hot or do you mean that when the heating is on cold it blows hot? many thanks paul
the heater blows warm air when fan is on low but blows cold air when fan is turn to higher setting
The heater fan ONLY blows the air, it does not make the temperature of that air. Your heater temperature controls how hot the air is. Adjust your heater temperature for hotter or cooler air.
Get the air out of your heater core.
Horn button is a momentary switch. Yours sounds stuck. Check the contacts. Once it grounds, the horn blows & sounds grounded.