1999 GMC Jimmy "warm air heater old" Questions

warm air depending on when i start the engine. could be your heater core or thermostat ,check to see if your water pump has a leak Check coolant level 1st. How old is the coolant? If you have no leaks

air turns cold and heater no longer works sounds like you do not have enough water in the system, or you have a faulty thermostat I know this is a old posting but I had a similar problem with my Jimmy

...air is bled out of system after replacing.if it runs at a normal operating temp,then i would say it is your heater core,also if it has a reostat it could be bad,it is a little circuit board down by ...

...warm air on low but not hot air the problem is the heater core hoses . old design did not let a lot coolant into the heater core . the old hoses bring in all the coolant. look at the picture i send. ...

...air to warm the car up inside..this needs to be fixed this time RIGHT i put 400$ in this car already..my 4 year old needs a warmer car..both heater core hoses are warm...the air gets warm inside just ...

...air maybe like warm , outside the heater is working , with no fault lights on . Flames are on . Inside controller is old mercury type switch could be broken ducting letting hot air escape or on the ...

...warm air for only a few second after the V-8 is warmed up and I turn the heat on. Then it turn to blowing luke warm air. I changed the thermostat and still nothing. I have a 6 year old and a 3 month ...

...warm air blowing. The heater motor wiring circuit is separate, and gets pretty complicated with electronic HVAC controls, but it does have fuses. If the blower motor works but you only get cold air, ...

...warm air just cold. AC works. Defrost blows cool air. Heater core is bad. Part is about $40...labor is around $700. The entire dashboard has to be removed and this is a major time involved job. It ...

...air With engine warmed up, feel of heater hoses under hood to see if both are warm (careful don't burn yourself). If they both are warm, flapper door which directs airflow through heater is not ...