heat/air position switch wont change! Help

[Black Pwrstroke]

Ok i just noticed it tonight but my switch is stuck on defrosed but i can turn the switch but will not change positions. Is there a fuse that might be burnt out and not letting it change? Let me know what you think.

[haulin99spd]

the switch has prolly gone bad.........

[Sinac]

I don't know about in the 02s, but the 99s run off a vacuum pump. I would start by checking your fuses.

[Dave]

You may very well have a vacuum leak somewhere, If you have the auto lock hubs they are usually where the leak is

[Black Pwrstroke]

I saw there was a fuse for somethin like this last night

[Dave]

Check that fuse if thats not blown you most likely have a vac leak

[Black Pwrstroke]

What do i do if i have a a vac leak. Could my switch be out if so what does it look like

[Hank]

Bet you $5 to a bottle of urine you have a vaccum leak in the hoses to your hubs. When this happens all you get is defrost...that's the signal!

[Black Pwrstroke]

so what would cause a vacum leak. How do i fix it?

[Hank]

Broken hose...loose connection....hole.....

Check your front hubs.....go do it!