vette22

I let my 93 LS go a couple of years ago with 300,000 miles on it, what a car! I currently have a 2004 LS 430 with about 100k and all is great. My 98 has about 190K ( another great car) the blower motor is intermittant and I understand it is wired a bit different than previous years. I have been looking for an electrical diagram that might help me out when I start to trouble shoot or any experienced advice would be great.

Thanks in advance, Mike

spuds

Nice to hear about your experiences with these cars,thanks.

Yamae

Attached is the electrical diagram related to the blower motor. The blower controller contains a power IC which has a PWM circuit inside to change the fan speed by the signal "SI". It comes from the A/C control computer.

As far as I have experienced, intermittent no run problems were not caused by the power IC. Either/both brushes or/and the commutator in the blower motor were about to wear out.

vette22

Thanks Guys, !!

deuce189

Yamae

That's the typical symptom of wearing out brushes in the motor. The commutator is barely touching brushes.

Those brushes are not in the parts list. The quickest way to fix is to replace the motor. But a skilled guy would only change brushes finding something equivalent. https://www.ebay.com/bhp/replacement-brushes-motor

deuce189

Yamae

The motor is located under the cabin filter and you can get to it rather easily if you are not too big. See attached below. This is for a 98 Celsior (RHD) and there may be some differences with yours but the structure must be almost the same.