Question about 1999 Jeep Grand Cherokee

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My air and heat controls do not work (no power)

This is been happening for about 6 months now. It would go off for about 2 to 4 days then come back on for a month or so .. But now its been 2 weeks and nothing. Ive checked the fuses and they all seem fine. I anybody could help please let me know.Thanks .

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I had the same problem check out this sight for a possible solution:

http://www.wjjeeps.com/blower_motor.htm

Posted on May 28, 2009

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2 Answers

How to fix my air/heat


have not heard of this happening in that order before. it is possible that water reached inside the dash and played havic on your dash controls or switch over module. simply put your door from heat to ac and fresh air is not working. try removing your glove box and look on top of your hvac box while switching your controls from heat to cold. you should be able to see the door moduel operate. if not more than likely it, bad.

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My toyota climate control unit is not turning on


You should check your fuses inside and also the fuses under the hood if that's not it then its a wiring problem in the dash somewhere.

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Possible speed control is open circuit or the fan motor. Check you have supply to the switch/motor.

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There are two fuse boxes. A baqttery junction box under the hood on the drivers side and one inside on drivers side. Good luck.


Fuse/Relay

Location

Fuse Amp

Rating

Power Distribution Box

Description

1 60A** I/P Fuse Panel

2 40A** Blower Motor Relay

3 50A** 4 Wheel Anti-Lock Brake System

(4WABS) Module

4 30A** Power Windows, Power Moon

Roof, Power Seat

5 50A** Ignition Switch, Starter Relay

6 20A** Transfer Case Relay

7 - Not Used

8 20A** Air Suspension

9 40A** Air Suspension

10 30A** PCM Power Relay

1 10A* A/C Relay

2 30A* Heated Seats

3 30A* Heated Backlight

4 15A* Fog Lamps and Daytime Running

Lamps

5 4 3 2 1

10 9 8 7 6

12 11 10 9

8 7 6 5

4 3 2 1

15 14 13

2 1 1

9

6

10

8

7

5

4

1

3 2

175

MEGAFUSE

Roadside emergencies

197

Fuse/Relay

Location

Fuse Amp

Rating

Power Distribution Box

Description

5 - Not Used

6 10A* Powertrain Control Module

7 30A* 4 Wheel Anti-Lock System

(4WABS) Module

8 15A* Rear Wiper Motor

9 20A* Fuel Pump Relay and RAP

Module

10 15A* Horn Relay

11 15A* Parklamps Relay and Mainlight

Switch

12 30A* Mainlight Switch and

Multifunction Switch

13 15A* Heated Oxygen Sensor, EGR

Vacuum Regulator, EVR Solenoid,

Camshaft Position (CMP) Sensor,

Canister Vent Solenoid

14 30A* Generator/Voltage Regulator

15 - Not Used

1 - Wiper Park Relay

2 - A/C Relay

3 - Wiper High/Low Relay

4 - PCM Power Relay

5 - Fuel Pump Relay

6 - Starter Relay

7 - Horn Relay

8 - Rear Wipe Down Relay

9 - Blower Motor Relay

10 - Rear Wipe Up Relay

1 - Not Used

1 - DRL Diode
2 - Electronic Engine Controls Diode

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2 Answers

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there can be a problem to air conditioner of the car . I guess you just have to go to the dealer or the toyota car shop for repair of the air conditioner . may be it's the fan of the air con that is not working properly. they can replace it .Because it is design to that car .

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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.

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My retired uncle has a 97 cadillac deville sts that runs well but after a short distance or time idling begins to overheat. He has replaced the water pump, thermostat and had the radiator and head gasket checked. Unfortunately he lives in a rural area and there is no local cadillac dealership for diagnostic repairs.

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