Question about 2003 Jeep Grand Cherokee

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Blower fan motor not working

The blower fan motor does not activate when climate control system is started. For both heat and air-conditioning.

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This fan is controlled by a fan relay, located under the dash. Most likely replacing that relay will solve your problem. Go to any autozone store, but the part and ask them to assist you in changing it. they offer this assistance as a free service.

Posted on Oct 06, 2009

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2007 Buick Lucerne CXL: Cooled seats not working. LIghts come on, temperature adjusters work but the motors under the seats do not come on.


Air Circulation
When the heated/cool seat switch is pressed to initiate operation of the climate control seat (CCS) system, cabin air is drawn through the heated/cool ventilation module air filter, then directed through passages in the foam of the seat cushion and seat back to the seat's occupant. In order for the CCS system to operate to its optimum performance, it is crucial to have unrestricted air flow through the system. A dirty or restricted air filter, the blockage of an exhaust air duct, a misaligned heated/cool ventilation module, or incorrect foam installation of the seat cushion or seat back will all have negative effects on CCS operation.
Heated/Cool Ventilation Module
Each heated/cool seat has 2 ventilation modules, one located under the seat cushion and one located in the seat back. These modules are controlled by the climate control seat module (CCSM). Each ventilation module contains a thermo-electric device (TED), a temperature sensor, and a blower motor. The TED and temperature sensor are mounted downstream of the blower motor. Each TED consists of a circuit of positive and negative connections sandwiched between 2 ceramic plates. Each ceramic plate is equipped with copper fins for heat exchange. The air flowing past these fins is either directed as conditioned air into the seat cushion and seat back, or directed into the cabin as waste air.
A TED is essentially a solid state heat pump that is used to heat or cool the air supply to the seat cushion and seat back. When voltage is applied to a TED, one side releases energy as heat, while the opposite side absorbs energy and gets cold. When the polarity of the current flow to the TEDs is switched, the hot and cool sides of the TED reverse.
During the following climate control seat system description and operation, the TEDs, blower motors, and temperature sensors will be referenced independently even though they are all packaged together as a module.
Climate Control Seat (CCS) System
The CCS system consists of two heated/cool ventilation modules and one climate control seat module (CCSM) that controls both the driver and passenger heated/cool seats systems. The CCSM is mounted below the front passenger seat cushion. It receives power from both, battery positive voltage and ignition 3 voltage.
Once a CCS system is activated, cabin air is drawn through the seat blower motors and directed across the fins of each of the thermo-electric device (TED) located under the seat cushion and in the seat back. The air is either heated or cooled as it passes over the TEDs. This conditioned air is then directed through channels in the foam of the seat pad and through small holes in the seat cover to the occupant. Once the system is activated, the CCSM uses a set of algorithms to control the temperature of the selected heating or cooling modes.
Your best bet is to take your vehicle to a qualified repair shop an have it diagnosed .
DTC B19A4: Driver Seat Back Blower Speed Circuit High

DTC B19A8: Driver Seat Back Blower Speed Circuit Short to Ground

DTC B103D: Driver Blower Power Circuit

DTC B272E: Driver Seat Back Blower Circuit Open
DTC B19A3: Driver Seat Cushion Blower Speed Circuit High

DTC B19A7: Driver Seat Cushion Blower Speed Circuit Short to Ground

DTC B2729: Driver Seat Cushion Over Temperature
DTC B19A2: Passenger Seat Back Blower Speed Circuit High

DTC B19A6: Passenger Seat Back Blower Speed Circuit Short to Ground

DTC B111D: Passenger Blower Power Circuit

DTC B272F: Passenger Seat Back Blower Circuit Open
DTC B19A1: Passenger Seat Cushion Blower Speed Circuit High

DTC B19A5: Passenger Seat Cushion Blower Speed Circuit Short to Ground

DTC B272A: Passenger Seat Cushion Over Temperature
Driver and Passenger Heated/Cool Seats Inoperative
  1. Ignition OFF, disconnect the C1 harness connector at the CCSM.
  2. Test for less than 5 ohms between the ground circuit terminal M and ground.
  3. ?‡'
    If greater than the specified range, test the ground circuit for an open/high resistance.

  4. Verify that a test lamp illuminates between the B+ circuit terminal E and ground.
  5. ?‡'
    If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.

  6. Disconnect the C2 harness connector at the CCSM.
  7. Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 1 and ground.
  8. ?‡'
    If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance.

  9. If all circuits test normal, replace the CCSM.


Sorry

Jul 10, 2016 | 2007 Buick Lucerne CXS Sedan

1 Answer

Why is fan control stuck on 4?


A mechanical fan/blower control that's stuck on 4 is a worn/faulty switch. The blower motor fuse could be blown or the blower motor is dead. A electronic fan/blower control that's stuck on 4 with no blower could be a blown fuse in your fuse box, the blower motor is dead or the climate control reading itself could be sending a false reading or the unit tself iis faulty.

Sep 18, 2015 | Subaru Impreza Cars & Trucks

1 Answer

Why is the fan not working that controls my air condition and heat?


You have four possible problems. Fuse, fan motor, fan switch, or fan speed controller. The first step is to check your fuses. Actually pull the fuses for the climate control out and look at them (sometimes cracks and end corrosion don't show up until you remove the fuse). Your next step is to run the car with the A/C fan set to high and use a multimeter to check for power and ground at the blower motor. After that I need an answer to the following question diagnosis can go any further. Does your car have knobs for the climate control system or a vertical row of buttons?

Sep 30, 2014 | 1980 Mercedes-Benz 280 SLC

1 Answer

My bmw 318 is blower fan not working


Blown Fuse
  • Usually the first thing to inspect when the blower fan stops working is the fuses to see if any are blown. Locate the 10A cluster fuse or the 25A HVAC fuse in your car manual, and examine them to determine if they need replacing. The car owner's manual will tell you where to find the fuses that are connected to the heat and/or air conditioning. On the interior fuse panel of the car, a 30 amp fuse is labeled "Heater" or "HVAC."

Bad Blower MotorIf the fan only works on setting number 3 or 4, or just on the highest setting, it is most likely that your blower motor is failing and is about to die. Use a voltmeter to test the amount of voltage at the blower motor connector with your ignition on and AC running. If it reads 12V, the motor needs replacing.Automatic Climate Control SystemAnother thing that causes the blower fan to malfunction is the Automatic Climate Control System (ACCS). If the ACCS's settings are off, it may cause the fan to stop working. If it is the climate control on the car, typically it is a bad thermostat or electrical circuit that is the culprit.
hope this helps, James Booth

May 17, 2011 | 1996 BMW 318

1 Answer

Blower motor not runing,when i turn on the ac or heat the fan will not run full speed


If you have manual air conditioning replace the high blower relay
If automatic climate control Air replace the blower module

Jul 29, 2010 | 1995 Buick Park Avenue

2 Answers

Rear a/c doesn't work i bought a blower motor and connect it to the car but still did not work


Check voltage to all three parts: the blower motor, the blower resistor which is directly connected between the motor and the the switch, or also it could be the switch (remember secure you ground the negative side of the voltmeter to either the battery or to the ground car).

Generally the auxiliary climate control system has dual controls for the driver and rear passengers consisting of temperature/air distribution and blower speed; the rear auxiliary climate control assembly is mounted in a separate overhead console positioned on the headliner above the second row seating area.

Also, with the Owners Manual, you can check the relays substuting it in each position in the fuse panel.

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Apr 13, 2010 | Ford Freestar Cars & Trucks

1 Answer

88 cadillac deville, ac blower fan wont shut off, even when car is turned off and key removed. I tried disconnecting the battery to reset the system but it still runs when battery reconnected. Also, car...


Ralph,
Most common cause of this is the blower fan (proper name for the fan you refer to) continuing to run is a shorted out Electronic Climate Control Module. This solid state device replaces the older style fan speed resistor block (at about 4 times the price) This unit is found on the top of the HVAC box under the hood. (HVAC means heating, ventilation and air conditioning) The HVAC box is found on the passenger side of the firewall. Look behind the A/C's accumulator. It will have an electrical wiring plug on top of it. It will be fastened to the HVAC box with a few 7mm hex head screws. Very easy to change.
FYI, do yourself a favor and replace the blower fan motor at the same time. The Electronic Climate Control Module usually fails because the motor is drawing to many amps of current. This is because it's bushings are worn out or the brushes are worn out.
This is very common on Cadillacs and Buicks.
Charlie
PS Not sure why car won't start. Either you drained the battery or blew a fuse which controls starting the engine. Need more info regarding the "no start" condition.

Jun 14, 2009 | 1988 Cadillac Sedan DeVille

1 Answer

Heat and Air blower does not work


hey there cjwalker,,did you try the blower ressistor its located beside the heatermotor ,,it controlls the speed of the motor ..should be easy to remove ,,,either 2 screws or else it just clips in,,,,,

Apr 19, 2009 | 1999 Mercury Grand Marquis

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