Yes blown head gasket. Does your radiator require topping up? Also another indication is that there are bubbles in the radiator. Remove plugs and check for condensation on the plug tips. This is a sure fire sign. Yes blown head gasket. Does your radiator require topping up? Also another indication is that there are bubbles in the radiator. Remove plugs and check for condensation on the plug tips. This is a sure fire sign.
Check your coolant level. It may be critically low.
thermostat stuck
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
Check coolant level Perhaps thermostat is not opening to allow coolant to circulate through engine and heater core
Check the coolant level. Usually low coolant levels will cause this.
thermostat
Get the air out of your heater core.
heater hoses might have been disconected
ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air? ihave a 1986 chevette that when i turn defrost on it blows out heat and when i put heater on it blows out only cold air?
The most common reason a automobile heater blows cold air is the water level is low. Check the water level and fill to the appropriate level.
the heater blows warm air when fan is on low but blows cold air when fan is turn to higher setting
you must have low coolant or a bad heater core