There is full heat to the back but no heat in front-dual climate control. Checked thermostat, coolant level, fuses and relays-all good. It seems there is something wrong with the temperature dial itself. I've run out of ideas, please help.
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1. coolant leak (level too low to fill heater core)
2. headgasket leak forcing the coolant out of the overflow.
3. stuck thermostat.
4. bad water pump. if the impelers are broken, coolant wont flow.
5. HVAC malfunction. system may think you selected cold or is unable to move diverter. maybe a fuse,solenoid or vaccum leak? (hvac controler uses vaccume controled soleniods)
6. airlock. if you have resently changed your coolant, you may need to repeatedly squeeze the heater core hose to help force out the air.
problem could be in the mode switch + check fuse to heater and ac mode switch.if blown your air door wont open and let heat enter inside car.if fuse look good you could have faulty mode switch.if you have climate control if you have a bad in vechicle sensor that will effect air door to open let heat in.this problem would be best for dealership.if dealing with climate control units.you need a quick fix.too cold outside not to have heat in car.
If the car is not providing heat and thermostat is good, then your problem is a faulty heater core. Sometimes when heat cores wear out, they sometimes give off an anti-freeze smell. You can go to autozone.com and register for full free online repair manual with everything you could need for your car.
is the heater tap opening??? have to check by sliding hot to cold control and getting someone to look under bonnet while you do it ...should be easy to see if the cable is moving it,if electrical check fuses or owners manual for fuse location,eg climate control
Check on the heater control valve. It is probably close to the firewall behind the engine. There will be coolant lines attached to it. This valve should have an arm on it that opens and closes a valve inside, either shutting off or allowing hot coolant to flow into the heater core. The arm should be attached to a cable coming from inside the car. See if the arm moves when you move the heat temperature level inside the car.
First where is the coolant temp at on the gauge, If the water isnt getting to 180 to 210 then you may have a stuck open thermostat.. Its also possible your water pump impellers are deteriorated to the point they dont push enough water. This is all based on knowing that noone put stop leak in the system. Stop leak could clog the heater core but not effect the engine and it could of caused the themostat to stick open. Also its possible your climate control knob is bad. I've seen then crack. Pull it off and look. Also listen with the fan on. Listen for the doors changing. Also do you have duel climate control. If you have heat in the back but not in the front then i'd suspect a control issue. If you have the same front anfd back I would suspect a coolant issue.
You probably have an air pocket in cooling system. If you can park the vehicle on an incline or jack the front up so radiator filler cap is higher than the heater core,remove cap and run engine until warmed up then run engine at about 1200 rpm you should then be able to see it bubbling then adjust level of coolant until its full.
The heater in your car depends upon a flow of hot coolant going through the heater core in order to get hot air into the car. If the heater core is partially plugged, it will restrict the flow. If you have a head gasket that is putting exhaust into the cooling system, it will eventually get into the heater core. When this happens there is no coolant in the heater core to make the air warm. If the water pump vanes have corroded away the result will be very poor coolant circulation causing the heater to not blow hot air. If your car is equipped with a heater control valve that is not functioning properly, the coolant flow will be restricted. One or a combination of these factors is likely the culprit in your case. Flush the heater core 2-3 times, and if the obstruction does not clear, a new heater core is required.