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Old 06-08-2014, 04:12 AM
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Can any one help on my jeep grand cherokee , I turn the fan to hi ,it blow only slightly out of vents , ? Does not change very well between setting , screen , face, floor?thanks, forgot to mention it's the overland model.
The fan works on low and when you turn know to hi fan increases but very little air coming out of vent when fan on hi is there something that regulates the flow out of vents can't seem to get any more flow from screen front vents or floor.
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Old 06-08-2014, 11:36 AM
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Re: Jeep grand cherokee 2001 heater !!!

May be your blower motor resistor?
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Old 06-08-2014, 02:38 PM
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Quote:
Originally Posted by Gtx15 View Post
May be your blower motor resistor?
No, a bad blower motor resistor would result in only high speed fan working with no low fan.

It may help to look under your glove box for a plug that looks something like this -

http://s1287.photobucket.com/user/ds...1709f.jpg.html

Try wiggling it or squeezing it together. The black wire sometimes gets hot or arcs which melts the plug a bit, making a loose connection. If squeezing or wiggling the plug makes the high speed come back on, then cut that wire from the plug and splice it back together.

Also, setting problems (face, feet, defrost) can be caused by a leak in the vacuum tubes that control that. A pretty good indicator of that is if the defrost setting only works. Otherwise I'd be looking to check the switch.
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Old 06-08-2014, 07:16 PM
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Re: Jeep grand cherokee 2001 heater !!!

The overland model uses the Automatic Zone Control system (AZC). There are no vacuum actuators in the AZC system, only electrical. Also, there are no flow control valves in the system, so even if a valve didn´t work properly, it would not cause airflow problems ( heating problems or mode select problems (windshield/vents/floor) can occur when blend door or mode door has problems. For recirculation door see the text below)
There are two common possibilities;
1) If blower motor controller was changed, then two wires where cross connected and the blower runs backwards, blowing almost no air.
2) The recirculation door hinge broke. The door will be laying on top of the blower motor, blocking almost all airflow. In this case, remove the blower motor and look up. If you see the door, try to move it by hand. If it moves, the hinge(s) is broken. A temporary repair (and for some the final) is a wire which holds the door up, but you loose the recirculation function. Final repair (changing the recirculation door) requires pulling the complete dash.
Eventhough a melted plug on the blower motor controller is quite common as well, this will normally only be discovered when the blower stops working completely. In this case several speeds can be heard from the blower motor, so the melted plug is not the problem overhere.
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Old 06-09-2014, 04:28 PM
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Re: Jeep grand cherokee 2001 heater !!!

Thanks for the replies I will have a look this weekend .thanks


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