Hey all, hoping to get some guidance here - I recently noticed that when I switch my AC/heater to High, it just doesn't work. The first three settings from Low and up work but at High, it just doesn't do anything. Any ideas what could be stopping it from working? It worked when I got the car and as far as I know is a very, very recent development.

If this should go into another section, let me know!

 

Probably have to pull the controls out of the dash and check the switch on the back side. Most likely just the high speed contacts are gone, which isn't a surprise since they draw the most amperage. It most likely just needs a new switch.

 

high speed blower relay

 

Thanks for the info! I figured it was something directly related to the hi-speed setting since the rest worked. Luckily it's not that cold or hot so I have a bit of time to work through it!