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warmth comes from the heater in the car
if it is climate control check the climate control module
check for heater control in the vent settings as the hot water tap may not be turning on
not blowing air or when switch is on blows cold air when you have climate control knob turned over to heat? it could be a switch or blower motor or fuse if its not blowing any air. if its blows cold air when knob is on heat then is can be thermostat or low on coolant or it could be climate control module or it could be a air filter in dash.
Could be the controller or a faulty blend door. The blend doors direct air thru the heater core and evaporator along with the vents. The controller uses electric motors to change the direction of air flow.
whatever this fuse controls is drawing too much power, you need to know exactly what this fuse is for before you can find the problem,it may be the fuse for more than one thing.......hope this helps........cheers.
Its more then likely the temp door broken or temp door motor broken/stuck. There is 2-3 of these motors under the dash on the side of the evap/heater core box. Some require extensive labor to replace, good luck
I have a 1998 Bighorn 3.0L if the wrong grade of oil is used in the motor it miss fires and runs rough, due to the injectors being oil pressure controlled, I have heard of extreme cases causing a failure to start when cold. good luck
Ok it may be that the heater core bypass valve isnt opening. All that valve dose is when you turn the climate control to heat it opens a valve that allows hot coolant from the engine to flow through the heater core. What I would do is check that. It will be on the left side (passange) of your engine bay.You will see two black coolant hoses next to eachother and one will have a black box with a wire that runs to it. Have someone move the climate control from hot to cold to hot back to cold. If you dont see the wire move then you can move it yourself to open the valve.
Let me know if the valve opens or not using the climate control.
A heater blowing cold air can be a few things. have all of these things check for proper operation to find the source of the problem.
1. Coolant level
2. Thermostat
3. Water Pump
4. Heater control valve
5. Make sure that the heater control doors are closing when you switch from hot to cold.
6.Last but not least if the climatic controls are electric it maybe at fault.
Good Luck
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