Question about 1999 Jeep Grand Cherokee

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Heater not blowing

Have replaced the blower motor and switch, have no ground anyone no where it is or what color

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Had the same problem. You need to check your connection at the fan regulator. It is located high on the floor (firewall) on the passengers side inside the Jeep. Power and ground come in on bottom side, power to the fan out the top side. My connection failed where the incoming power plugs in to the regulator. Plug had gotten so hot it looked burned. I snipped off the faulty plug, bought some good female spade crimp connectors at Farm and Fleet to repace the plug, and no problems since.

Posted on Feb 08, 2009

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Blower motor ground is generally to the body. Just attach a decent gauge wire (I use 12gaq or 14ga) to the body and using a loop end (crimp connector), remove one fastener from the blower housing, put screw through wire end and re-fasten. This will re-establish ground. Grounding is likely the least looked at part of the electrical system, but is extremely important for all electronics to operate properly. On every vehicle I own, I go further than I outlined, running a 10ga wire from the battery, attaching it to the near point on the fender, around to the firewall, through the firewall to the dash bracket inside the cabin and another branch to the opposite fender and radiator support. I also add a second ground to the battery, directly to the block in a different place than the standard ground, usually to one of the starter mount bolts. In doing this, I eliminate any possibility of ground loss to essential components.Your original ground wire should be black and likely was attached by a spade connector much as I outlined above.

Posted on Feb 06, 2009

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1 Answer

What color is the hot wire on heater fan control


Assuming you have manual heater controls...

The hot wire is pink with white. this is power from the blower relay. this is a ground side controlled system meaning that the speed switch controls the path to ground for the blower motor.

If the switch is bad or you see power on both wires at the blower motor with the connector plugged in than there is a ground issue.

if you ground the orange with black wire and the blower still does not work than the blower is bad.

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check the heater fuse if it is not blown then you may have to replace the blower motor

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My heat has stop blowing. replaced blower, and heater on off switch. what else could it be?


LX? DX? EX? Hatchback? sedan? wagon?coupe? engine size? did you check the fuse? Fuse #19, 30 amps in the auxilary fuse box (your owners manual may show the location ,it may be near the blower ?). The Blue/White wire at the heater blower motor should be HOT (12v) with key on. If you ground the Blue/Black wire the motor should run full speed.

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Apr 12, 2010 | 1998 Ford Contour

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The front heater blower does not blow but you can feel the heat if you put your hand on the vent. The back vent blows a/c but when you switch it to heat you can't feel heat but you can still hear the...


on the front blower make sure the fuse is ok if it is then check the relay if its good as well then youll ned to replace the blower motor. as far as the rear it sounds as if the air handler is not operating properly you need to locate it and ensure that nothing is blocking it from turning.hopes this helps you.

Oct 03, 2009 | 1995 Plymouth Voyager

1 Answer

Blower motor doesn't blow anymore, This blows


If it blows only on high speed, it is the resister.
If it does not work at all, check fuses first. See owner manual for location.
Then check blower motor by jumping 12 volts from battery to blower motor. Make sure ground is jumped too.

If it works now, it's the control panel. If not, it is the motor.

Blower Motor —Front Removal and Installation
  1. Prepare the vehicle for blower motor (19805) removal.
    1. Disconnect the battery ground cable (14301). For additional information, refer to Section 414-01 .
    1. Remove the air cleaner assembly. For additional information, refer to Section 303-12 .
  1. Detach the speed control servo.
    1. Disconnect the electrical connector.
    1. Remove the bolt.
    1. Position the speed control servo aside.
  1. Position the coolant expansion tank/windshield washer reservoir aside.
    1. Remove the screws and the nuts.
    1. Position the coolant expansion tank/windshield washer reservoir aside.
  1. Remove the blower motor.
    1. Disconnect the vent hose.
    1. Disconnect the electrical connector.
    1. Remove the four screws.
    1. Remove the blower motor.
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Also,

Heater Blower Motor Switch Resistor(s)
The front heater blower motor switch resistor has the following features:
  • The assembly is located in the engine compartment on the evaporator housing (19850) next to the blower motor assembly (19805).
  • Three resistor elements are mounted on the resistor board to provide four blower motor speeds.
  • Depending on the heater blower motor switch position, series resistance is added or bypassed in the A/C blower motor circuit to decrease or increase A/C blower motor speed.
  • An overheating device (thermal limiter) will open the resistor coil circuit when the temperature reaches 121°C (250°F), interrupting the blower motor operation in all speeds except high.
  • The thermal limiter cannot be reset and is not serviceable.

Aug 10, 2009 | 2001 Ford Explorer Sport

1 Answer

03 wrangler heater-A/C only blows on high.


Check the blower motor resistor, I,m not sure where it is located on your vehicle most are on the firewall under the hood.

Nov 12, 2008 | 2003 Jeep Wrangler

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