The heater core valve is probably sticking or adjusted wrong.
There is a door behind the dash that changes cold and hot air flows. The door is probable stuck or the control circuit has failed causing the hot air to blow on cold.
Check into the temperature control valve--this is different than the thermostat.
Check temperature control cable for binding.
Temperature control set to heat?Needs refrigerant charge?
The control for the heat on the dash has a control for the back seat and also has a setting that says something like "Rear Control". This allows the passengers in the back seat to control their heat independently via a temperature control in the back seat (on the back of the center console). So you could have the heat on in the front and the rear on "rear control" and if the passenger in the back has set their control to cold, it wold blow cold air in the back even though you have the heat on in the front.
Try replacing the temperature control switch for the rear control cluster. Hope that that's the fix. Less than $20.
There is no 1995 ford Expedition!
Blow by is caused by internal engine problems. You need a new engine.
Martin - 1992 Blow Baby Blow 4-3 was released on: USA: 23 September 1995
Low coolant? Heater core airbound, resgtricted, or plugged? Bad thermostat? Heater control cable not adjusted properly?
Air masses change in temperature
why dont bottom vent doors not open on 2001 gmcsonoma
temp. control actuator or most of the time is the actual control head. ck for power and grd. at act. and resistance (ohm) check also
It sounds like a bad thermostat. I would have the radiator flushed and have the cap and hoses checked as well.
sounds like a vacum leak in the temperature control panel or from the engine to the control panel, the line from the engine to the control panel is black, and gets split at the panel, has the engine been running a little rough or a lack of power, this might explain it
Low coolant? Bad thermostat? Heater core restricted, plugged or airbound? Temperature control not working? Water pump not circulating coolant?
Check your temperature control switch. It is hooked to a cable it could be stuck on hot or needs a new one.
If your coolant level is fine but your engine temperature gauge is reading on the cool side all the time , your thermostat is probably sticking open. ( or you have no thermostat , or the wrong thermostat - one that has too low of a temperature range ) Anybody else have any ideas ?
blow head gasket
Faulty blend door control, clogged cab filter, weak HVAC blower, obstruction in the HVAC ducts.
It may pop depending on the level and temperature it is on.
Low coolant? Thermostat not opening? Heater core restricted or plugged? Heater core airbound? Water pump not circulating coolant? Temperature control not working?