- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
topic cars and HVAC heat lost.
the heater blower resistor is bad.
or controls to it bad.
the vent problem is bad vent actuators or controls to them.
see hvac here
There's a small motorized flap that's controlled by the heating and ac system that's gone bad. This part changes the air to flow from the ac or heating side depending on settings. I had a 1999 Jeep Grand Cherokee with the same issue, the fix is relatively simple once you get to it, however you must completely remove the dash to get to the part. The part is about 15.00. When removing the Dash you MUST disable the air bags, if you do not you risk injury or death if they are accidentally deployed.
Air is getting into the system. Tighten all hoses and do not overlook the hose going to the expansion tank. When car cools that hose sucks water back into system but if not tight it will suck in air. Could be why you constantly have to "burp" the system.
Sounds like the flapper valve for the rear heater/AC core is not doing its job to send the air through the AC core when called for.
Another clue of this is the fact that the air is coming out on the lower vents when it should be up high fro AC.
Have someone listen back by the fan inlet in the back usually on the right while you switch between AC and heat to see if they hear any noise or change in air flow.
Worst case is that the interior panel there has to be removed to service the assembly behind it.
the flap in the air box may be broken or not ingageing all the way check for vac leaks and switch the air from defrost to vent and see if its working properly
2 possibilities. 1 - the heater system isnt getting adequate hot water flow from the engine and not heating the air for your heater to function. This can be due to a defective heater control water valve, a plugged heater core, a disconnected or plugged heater hose.
2 - the system is in fact getting heat, but your heat is bypassed/lost due to dashboard vent and blend door errors breakage common with that era of jeep. have the valve/cor/heater hose flow checked. If that doesnt show issues, have the vent control system checked for blend door or dash door breakage. beware, its alot of labor to change the dash solenoids when they brake, ALOT of labopr (6 hours or more!) so if you are committed to fixing it because a solenoid and/or sensor broke in there, I highly recommend you chaneg ALL solenoids wuith new rather than risk another breaking in a month and the 6 hours of labor must be repeated.
is this a problem w/ the interior vents? maybe stuck venting in outside air rather than from the heater box? did the heat only stop working after the radiator/hose install? if so, then you probably have a big air pocket stuck in the heater core.
theres a sensor to open the right vent for the ac try flipping
the switch to heat to ac if this doesnt work than you will have to take to a dodge dealership
common problem, check under dash by the gas pedal if control arms are muving went selecting from ac to heat cuz this it is the control for the vents to go from ac to heat and to defrost.
×