Blower swithch not working

1999 MERCEDES BENZ ML430

2,000,000 MILES • 4.3L • V8 • 2WD • AUTOMATIC

DSTOREY911

MEMBER
1 POST
FOLLOW

I was having a blower switch not working on high. so I replaced the A/C climate control console with a new one. It work at first but I had no hot or cold air. I checked the fuses and now I have no fan blowing at all. I even put the old one back in and still nothing.

Any ideas?

Jan 19, 2020 at 9:40 AM

TOUGHDIVER

CERTIFIED EXPERT
224 POSTS

Hi,

It could be the heater blower motor regulator is faulty, I'm attaching wiring diagrams of the heating system for you to check the fuses, wiring and grounds. I'm also attaching replace heater blower motor regulator replacement procedure below for you to check voltage drop across the blower motor circuit. Please let us know if this information was helpful and if you need more information.

https://www.2carpros.com/articles/car-heater-not-working

https://www.2carpros.com/articles/how-to-check-wiring

Thank you
Joe T.

Images (Click to enlarge)

Jan 19, 2020 at 6:40 PM