richard-tx

I was reading about the rear footwell heaters. No wonder they don't last long. The heater consists of 4 transistors on a heat sink. Then they drive the transistors into DC conduction creating heat. Seems to me that replacing the transistors would be a lot cheaper than replacing the entire unit especially after replacing the transistors with ones that can carry more current without burning up or by adding a bias limiting circuit so the transistors can't reach runaway temperatures.

Does anyone have a bad heater that they can send me for evaluation? I will repair it and send it back to you.

bobster1121

I have a fault in the rear left but uk based.
Same problem I dare say.
If you work a fix I would be interested.
Regards bob

NOR_KNet

I actually have 2 sets. Tried replacing mine with some used heaters but only worked for a month or so.

But i live i Norway though. No problem shipping one or both to you if u want.

Regards
Kenneth

richard-tx

Kenneth hasw my address and I should receive the units. Once I have them, then I can do an autopsy on the units and come up with a good fix.

rich

richard-tx

I got a couple of bad units in (thanks very much). However the silly thing is potted with some sort of epoxy resin. Unless I can figure out how to easily remove the potting compound, repairing the units are impossible.

I tried briefly with a heat gun, but will have to get aggressive. I cant even get to the transistors to measure resistance.

richard-tx

That potting compound is indeed an epoxy or waterborn potting compound. There is no fixing it. Maybe I will get really curious and cut it apart to see what it really is.