yeah those 12vdc ceraminc heaters are good but they draw alot of current. I had one in my other celica and it didn't do a thing even with direct connection to the battery. I think it draws like 20amps.
Whats the problem with yours? mine seems to work okay even when i removed the thermostat (just takes a bit longer to warm up and heat up).
I know my rear demister lines are stuffed but the jaycar silver conductive pen can fix that.
Usually what i do to demist my front windscreen is set the contol levers to:
temp - HI
air - recirc or fresh
defrost, and pull fan to high
and have the drivers window a bit open
fonzy
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