Does the heating element have mercury in them

Could be the capacitor or the heating element (or igniter if it's a gas unit). Unless you're a qualified HVAC repairman, call your local HVAC company to come take a look at it.

I can't find a direct answer, but would say no, since there are so many federal laws about mercury. Most heating elements use nichrome 80/20 (80% nickel, 20% chromium) wire, ribbon, or strip. Nichrome 80/20 is an ideal material, because it has relatively high resistance and forms an adherent layer of chromium oxide when it is heated for the first time.
Hamilton Beach Good Thinking

you talking about the socket? check the fuse and ground wire to it?

or are you talking about those older heating elements with a handle that plug into those "power outlets" is what the new term for those holes are called

could be that a separate fuse runs the element to heat the seat, or relay. try unplugging the connector under the seat and replug in to see if that fixes it. check for power at the feed side of the loom plug before you replug it to the seat .

To install the new heating element the seat covering will need to be pulled apart so that new heater can be installed. you will need to ring the fastener and carefully pull covering back, to have room to remove old one and wires.

Hello
Before doing anything check the fuse box. If all the fuses are ok - this means you have to fit new heating element.

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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This sounds like the blend door actuator. This is a little door in the vent box down under the passenger side dash that opens and closes to change the vent temperature from heat to a/c. It is a little motor that opens the door. It tends to stop working due to the elements that it is in. I hope this helps!! Thanks!!

You could pull the fuse or heating element connector till you fix the switch.

sounds like the heater element in the seat is not working