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SUVs Jeep Cherokee and Jeep Grand Cherokee Jeep Grand Cherokee A/C Heating Ventilation
372 messages, Last post on Oct 27, 2009 at 2:04 PM
You are in the Jeep Cherokee and Jeep Grand Cherokee Forum. Your Hosts are steve_ & tidester
| I have the same problem as most others with the blend doors, etc. I had my mechanic remove the dash, replace the blend door housings and blend door motors, the heater core and evaporator core. I also had the radiator and water pump replaced this summer. In other words almost everything is new. However I still have poor heat flow and am concerned I'll have poor AC performance once we hit the summer. What do I do next? When I have the blower on low the heat is okay (not hot by any means) but when I turn the blower to 3/4 or high the air is lukewarm at best. I also have what I think is poor air flow (not much air pressure coming out of the vents). Any suggestions would be greatly appreciated. The temperature in Minnesota has been between 10 and minus 20 for the past few weeks and the Jeep never gets very warm, especially after spending around $2500 the past few months to fix the problems. | |
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Replying to: mbouch67 (Jan 22, 2009 6:59 pm) Thank from Chaska61 |
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| When I switch from defroster mode to heat thru the vents and floor nothing happens the defroster continues to blow heat but that is it. | |
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Replying to: tmann1961 (Nov 26, 2007 10:44 am) you will see wires and a connector. tap with hammer this is the controls box also jiggle wires that go into the white plastic connector. I have had the same problem and fixed it bye rewiring the white connector |
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| I was having blower motor problems and traced it back to the resistor connector. When the motor stops working, if I move the connector wiring to the resistor around it will turn back on. So I bought the wiring repair kit and redid the wires and connector to the resistor but it is still not working. the old connector had melted the plastic away from the resistor cover too. Could that affect the connection? Now I can't even move the wires around for any heat and it is freezing. | |
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My 2004 Jeep Grand Cherokee intermitently blows warm and cold air at the same time. The dealer said it was a bad door in the dash and removed the dash and replaced it once under warranty and it still is doing the same thing and the warranty is over. When it does this all you have to do is shut the engine off and start it again and the problem goes a way until it happens again. It sometimes takes days or weeks to happen again. Also, something that just started happening is when you turn the vehicle off you hear what sounds like a vent door opening and closing coming from the passenger side under the dash. |
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If you have the Automatic Zone Control system (AZC) with the dual control system. Before you do anything else! The first thing you should do is use the AZC fault code system. To read the fault codes: 1. Turn on the ignition switch. 2. Turn on the AZC system. The temperature settings should be displayed for both sides. 3. Simultaneously hold down the AC and the Re-Circ buttons. 4. Then turn the driver’s side temperature (Left) control knob to the right (CW) one click. 5. Then release the AC and Re-Circ buttons. If there are no fault codes, the “00” display value will remain in the window. If there are any codes, each will be displayed for one second in ascending numerical sequence (note: no effort is made to display faults in the order they occurred). The left side set temperature display will be blanked and the right side set temperature display will indicate current and historical codes (8 historical max) presently active. Once all codes have been displayed, the system will repeat the fault code numbers. This will continue until the left side set temperature control is moved at least one detent position in either direction, by pressing both the A/C and Recirc buttons at the same time, or the ignition is turned off. Also describe any symptoms you are having with your heating system. Like - Are you getting a good air flow thru your vent outlets? Can you direct the air flow to the different outlet vents? Post your fault codes and symptoms or send a message to Blen Dor.
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Replying to: blendor (Mar 21, 2009 10:23 am)
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Replying to: msa3 (Mar 21, 2009 2:31 pm) But I am confused with the description “Cold and warm air coming out of the vents at the same time”. Would that be cold air coming out of the vents on one side of the vehicle and warm air coming out of the vents on the other side of the vehicle? The sound of the doors opening and or closing is most likely the actuator motor putting tension onto the blend doors during the calibration process. Briefly, the calibration process happens every 20 ignition cycles, it is the computer finding the location of the two openings, which will let the computer know where to position the blend doors according to the temperature that was set on the display. Does the heating system work good, between the once every few months cold and warm air problem?
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