Question about 1999 Jeep Cherokee
You have problems with one or more vacuum lines.
The flow of air is controlled by opening or closing ducts with vacuum.
Check the vacuum reservoir under the hood (probably a round plastic canister with two hoses attached) to make sure one of the spigots is not broken off (yeah, it's plastic) and the hoses are intact.
One of the hoses leads to the intake manifold the other goes to the in-dash control unit.
If you see no problem there, you will have to pull the control assembly from the dash and check those hoses too.
I wuld highly recommend you spring for ~$20 US for a Haynes manual for your Jeep. About any parts store will have them.
It will help you now and maybe keep some schlock mechanic (I know, I'm not talking about you guys) from ripping you off.
Posted on Aug 20, 2008
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Posted on Jan 02, 2017
SOURCE: blower vents on 86 regal
The blend door in the heater box itself is what directs the air to where it needs to go as per selector switch. The heater box is located under the dash.
Posted on Jun 13, 2008
I'm looking at the circuit in a haynes manual and the 40 Amp breaker is the only one showing, but there is a blower motor relay in the power distribution center in the same area as the fuse, it might be that (you could do a temporary swap with another of the same type to confirm). I doubt the motor brushes are worn out already on a 2007,so I'm guessing if not the relay then a wiring problem or just a faulty blower motor. if you have a meter or circuit tester I would check the power at the blower motor itself to confirm wiring or motor. good luck
Posted on Aug 23, 2009
Replace the Blower Resistor. (About $12).
The resistor might be good; I have found that the terminals corrode, create resistance and sometimes melt the connector (About $100). Check the resistor before replacing it! If the connector gets fried, solder pigtails onto the good resistor and use Marr connectors to attach the pigtails to the existing wires,
Posted on Jul 15, 2010
sounds like you have done all the hard stuff maby its the switch inside [on/off] on the dash that is not working properly.. i hope this helps its the first thing i thought of...
Posted on Jun 02, 2011
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