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Drum turns but will not heat. How do I get to heating element to check..

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Check the house breakers for the dryer first--push off, then on. If no help, remove the top (screws in the back and slide off or use a thin putty knife to push into the seam at both front corners to release spring latches). Take screws out of the front sides to release front panel and then lift up to release at bottom. It will help to release the drive belt tension at the motor (through a small panel in back). Remove the mounting screws in the center rear of the drum and remove the drum along with the belt. The heating element(s) are behind the drum. Check (and replace if bad) to see if the belt is heat damaged. Good luck!

Posted on Nov 12, 2009

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2 Answers

1994 c2500 rear drum removal problems


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The information set forth below is the approach used in our shop.

There is a high probability that one of the conditions set forth below is causing your drum to bind as you try to remove it. The simplest solution is to use your brake spoon develop the maximum amount of spacing between the brake shoe and the drum.

If that doesn't work, on occasion we've had to use a chisel or a cutting torch to remove the drum. It is very seldom that such drastic measures must be taken but it has happened.

Surface/Heat Checks/Cracked Drum/Out-Of-Round Drum Brake drums act as a heat sink. They absorb heat and dissipate it into the air. As drums wear from normal use or are machined, their cooling surface area is reduced and their operating temperatures increase. Structural strength also reduces. This leads to overdistortion, which causes some of the drum conditions covered here.

Scored Drum Surface
A scored drum surface shows a scored drum surface. The most common cause of this condition is buildup of brake dust and dirt between the brake lining and drum. A glazed brake lining, hardened by high heat or in some cases by very hard inferior grade brake lining, can also groove the drum surface. Excessive lining wear that exposes the rivet head or shoe steel will score the drum surface. If the grooves are not too deep, the drum can be turned.
f45-17.gif Example of a scored brake drum. Courtesy of Wagner Brake Products. Bell-mouthed Drum
Bell-mouthed drum shows a distortion due to extreme heat and braking pressure. It occurs mostly on wide drums and is caused by poor support at the outside of the drum. Full drum-to-lining contact cannot be achieved and fading can be expected. Drums must be turned.
f45-18.gif Example of a bell-mouhed brake drum. Courtesy of Wagner Brake Products.

Concave Drum
A concave drum exhibits an excessive wear pattern in the center area of the drum brake surface. Extreme braking pressure can distort the shoe platform so braking pressure is concentrated at the center of the drum.
f45-19.gif Examples of concave and convex brake drums. Courtesy of Wagner Brake Products.

Convex Drum
A convex drum exhibits excessive wear at the closed end of the drum. It is the result of excessive heat or an oversized drum, which allows the open end of the drum to distort.

Hard Spots On The Drum
This condition in the cast-iron surface, sometimes called chisel spots or islands of steel, results from a change in metallurgy caused by braking heat. Chatter, pulling, rapid wear, hard pedal, and noise occur. These spots can be removed by grinding. However, only the raised surfaces are removed, and they can reappear when heat is applied. The drum must be replaced.

Threaded Drum Surface
An extremely sharp or chipped tool bit or a lathe that turns too fast can result in a threaded drum surface. This condition can cause a snapping sound during brake application as the shoes ride outward on the thread, then snap back. To avoid this, recondition drums using a rounded tool and proper lathe speed. Check the edge of the drum surface around the mounting flange side for tool marks indicating a previous rebore. If the drum has been rebored, it might have worn too thin for use. Check the diameter.

Heat Checks
Heat checks are visible, unlike hard spots that do not appear until the machining of the drum. Extreme operating temperatures are the major cause. The drum might also show a bluish/gold tint, which is a sign of high temperatures. Hardened carbide lathe bits or special grinding attachments are available through lathe manufacturers to service these conditions. Excessive damage by heat checks or hard spots requires drum replacement.
f45-20.gif Example of a heat checked and over-heated brake drum. Courtesy of Wagner Brake Products.

Cracked Drum
Cracks in the cast-iron drum are caused by excessive stress. They can be anywhere but usually are in the vicinity of the bolt circle or at the outside of the flange. Fine cracks in the drums are often hard to see and, unfortunately, often do not show up until after machining. Nevertheless, should any cracks appear, no matter how small, the drum must be replaced.

Out-Of-Round Drum
Drums with eccentric distortion might appear fine to the eye but can cause pulling, grabbing, and pedal vibration or pulsation. An out-of-round or egg-shaped condition is often caused by heating and cooling during normal brake operation. Out-of-round drums can be detected before the drum is removed by adjusting the brake to a light drag and feeling the rotation of the drum by hand. After removing the drum, gauge it to determine the amount of eccentric distortion. Drums with this defect should be machined or replaced.
f45-21.gif Measure the inside diameter of the drum in several spots to determine out-of-roundness.

An out of round or tapered drum prevents accurate brake shoe adjustment prevents not only difficult removal but also can cause excessive wear of other brake parts; excessive tire wear; and, a pulsating brake pedal.

All the best

Ben

Jun 15, 2011 | Chevrolet 2500 Cars & Trucks

1 Answer

The driver's side heated seat won't turn off on my 2003 Mecury Moutaineer. Also, how do I change my cabin filter?


Your vhicle build date is on a blue sticker on the driver door or door frame. If not there, check other doors.
The heated seat Module is under the seat. You can unplug the connector on it or the heated seat switch to shut it off. I supect the module is bad. get one used from car-parts.com. The cabin air filter is under the leaf screen at the base of the windshield. Remove wiper arms and leaf screen for access. Please rate, thanks. Principles of Operation - Heated Seats - Vehicles Built 03/2002 Onward
NOTE: Two heated seat modules are used, one for vehicles built up to 03/2002 and one for vehicles built 03/2002 onward. The modules are not interchangeable.
The driver and passenger heated seats share a common battery and ignition feed. A shared ground source supplies the heated seat control switches. When the heated seat control switch is pressed with the ignition switch in RUN or START, a momentary ground signal is sent to the heated seat module. The heated seat module then supplies power to the heating element circuit. The cushion element and seat backrest element are wired in series and powered by the same output. The heated seat module also will ground the separate indicator circuit at the dual automatic temperature control (DATC) module display panel to indicate an ON state. The heated seat module will remain on until the heated seat control switch is pressed and a momentary voltage signal is received, or until 10 minutes expire. If the ignition source is removed from the module, the heated seat module will enter an OFF state and will not return to ON until the switch is once again pressed with the ignition switch in RUN. The heated seat module is designed to heat the seat to 37.5?C (99.5?F) and maintain the temperature until time-out or switched off. This temperature is maintained by the heated seat module monitoring the temperature sensor located in the seat cushion element, and adjusting the current flow to the heating elements.
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May 22, 2011 | 2003 Mercury Mountaineer

1 Answer

2005 hyundai tucson v6 passenger side heated seat will not warm up the light comes on. driver side is ok could it be the switch even if the light comes on


Possibly.... the only way I know to diagnosis this issue is with an amp meter in the circuit that heats the seats. Compare LH & RH seat heating current draw. If you find the pass seat is NOT drawing the same amount of current, further troublshooting is required. There are TWO heating elements installed in the seats -- seat bottom & seat back, and they are connected in 'SERIES'... so if either element goes/is 'OPEN', then it's component replacement time. There is a thermostat in the heating elements -- it regulates the seat temperature. One must isolate the two elements & check each one individually (seat bottom - checking resistance... and seat back - checking resistance). whichever one (or possibly both) are 'OPEN'. If you find resistance is normal (3 to 5 ohms), then the problem/cause may be in the switch (or its contacts). Using a test light (12 volt bulb), check for power (battery voltage) at the heating element connector to ground (chassis). If the bulb lights up, you know you have power at the switch and is sending it to the heating elements.

Nov 09, 2010 | Hyundai Tucson Cars & Trucks

1 Answer

2006 tahoe with heated seats. when the seat is


The heating element in the seat may be failing, even thogh it heats the seat, the element could be causing the circut to spike upon power shut down. Relay takes mili-second to shut down after ignition kill and power feed comes direct from battery. Check amp. draw at switch of bad seat and good seat upon shut down. If bad seat higher that 5 amp difference element n/g. Also check for bad relay as they can short internal and cause problems if primary power cut before switch shut down.

Jan 30, 2010 | 2003 GMC Sierra 1500

2 Answers

FRONT HEATED SEATS


you need to check the resistance in each of the heated seat elements in the seat. There's a two wire connector under the back of each front seat. The connector should be green. disconnect it and measure the resistance along the circuit going into the seat. if it isnt .1 - .3 ohms, replace the appropriate heated seat element

Jan 04, 2010 | 2004 Cadillac Escalade

1 Answer

Electric dryer tumbles but no longer heats.


The first thing to check is the house electrical panel to see if the dual breakers for the dryer are tripped. Push off, then on--recheck the dryer. If still nothing, check for ~230 volts AC at the dryer power socket--two slanted slots. If nothing or near zero, remove the dryer power plug, and recheck the breakers again--if tripped again, there is a short in the dryer--usually the heating element located behind the drum. The drum must be removed to service the heater.

Dec 14, 2009 | Cars & Trucks

1 Answer

Oven does not heat


Your problem could be in your control switches or a bad heating element. Using a voltmeter check for 240 AC volts at the heating element connection. If voltage is present your heating element is most likely the problem. If no voltage is present then something in the control circuit is malfunctioned. I had this same problem about a month ago. Using the above troubleshooting I determined the heating element was defective.

Nov 20, 2009 | Cars & Trucks

1 Answer

2002 Grand Cherokee Heated Seats don't work


I will post it in 2 different posts because its too long DB

HEATED SEAT SYSTEM
Individually controlled driver and passenger side electrically heated front seats are available factoryinstalled optional equipment on this model, when it is also equipped with the power seat option. The heated seat system allows both the driver and the front seat passenger the option to select one of two seat heating ranges, Low or High, or to turn the individual seat heaters OFF using the heated seat switches located in the center lower bezel near the bottom of the instrument panel center stack. The heated seat switch circuit operates on ignition switched battery current supplied through a fuse in the junction block, only when the ignition switch is in the ON position.

The heated seat system consists of the following components
  • Heated seat elements
  • Heated seat sensors
  • Heated seat module (or memory heated seat module)
  • Heated seat switches.
The heated seat system also relies upon resources shared with other electronic modules in the vehicle over the Programmable Communications Interface (PCI) data bus network. The PCI data bus network allows the sharing of sensor information. This helps to reduce wire harness complexity, internal controller hardware, and component sensor current loads. At the same time, this system provides increased reliability enhanced diagnostics, and allows the addition of many new feature capabilities. For diagnosis of these electronic modules or of the PCI data bus network, the use of a DRB scan tool and the proper Diagnostic Procedures are recommended.

The electronic modules that may affect heated seat system operation are as follows:
  • Body Control Module (BCM) - Refer to Body Control Module in Electronic Control Modules for more information.
  • Heated Seat Module (HSM) - Refer to Heated Seat Module in Electronic Control Modules for more information.
  • Memory Heated Seat Module (MHSM) - If the vehicle is equipped with the Memory System, refer to Memory Seat Module in Electronic Control Modules for more information.
Refer to Power Seats Premium I/III in the Contents of Wiring Diagrams for complete circuit diagrams. Following are general descriptions of the major components in the heated seat system.

The heated seat system will only operate when the ignition switch is in the ON position, and the surface temperature at the front seat heating element sensors is below the designed temperature set points of the system. The heated seat system will not operate in ambient temperatures greater than about 41 °C (105 °F) . The front seat heating elements and sensors are hard wired to the Heated Seat Module (HSM) or the Memory Heated Seat Module (MHSM).

The heated seat switches are hard wired to the Body Control Module (BCM). The BCM monitors the heated seat switch inputs, then sends heated seat switch status messages to the HSM or MHSM over the Programmable Communications Interface (PCI) data bus. The HSM or MHSM contains the control logic for the heated seat system. The HSM or MHSM responds to the heated seat switch status messages, ignition switch status messages, and the front seat heating element sensor inputs by controlling the output to the front seat heating elements through integral solid-state relays.

When a seat heater is turned ON, the sensor located on the seat cushion electric heater element provides the HSM or MHSM with an input indicating the surface temperature of the seat cushion. If the surface temperature input is below the temperature set point for the selected Low or High heated seat switch position, the HSM or MHSM energizes the integral solid-state relay, which supplies battery current to the heating elements in the seat cushion and back. When the sensor input indicates the correct temperature set point has been achieved, the HSM or MHSM de-energizes the solid-state relay. The HSM or MHSM will continue to cycle the solid-state relay as needed to maintain the temperature set point.

The HSM or MHSM and the seat heater elements operate on non-switched battery current supplied through the power seat circuit breaker in the junction block. However, the HSM or MHSM will automatically turn OFF the heating elements if it detects an open or short in the sensor circuit, a short or open in the heating element circuit causing an excessive current draw, or when the ignition switch is turned to the OFF position.

See the owner's manual in the vehicle glove box for more information on the features, use and operation of the heated seat system.

I WILL POST THE REST

Jan 31, 2009 | 2002 Jeep Grand Cherokee

2 Answers

Heated Seats


I had the same problem on my 04 LeSabre. To check to see whether it was the element or the switch, I unplugged both seats and ran jumper wires to make left switch control the right element. The switch and element worked properly. Then I ran jumper wires to make right switch control the left element. The problem was the same, so it was the element was bad.

I had my element replaced at the dealership, since I didn't want to wreck my leather seats. It cost over $400 (about $150 for the element). I guess it just tucks next to the old element - the old element stays in place.

Jan 13, 2009 | 2004 Buick LeSabre

1 Answer

2004 Honda Element has no cabin heat


check your fuses sound like its your blower motor.good luck happy holiday

Dec 22, 2008 | 2003 Honda Element

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