How to fix defroster on 1985 Chevrolet truck 

Your video gave me great instruction on diagnosing my 1985 GMC SIERRA Defrost problem and the issue. I found my issue, repaired the broken Vacuum line and now I have Defrost. Thanks!!! GE

Just wanted to comment on here and say THANK YOU for doing this video. Helped me find the one line that ran through the firewall (was previously burnt) and was able to connect it to my throttle body and now I have heat again!

I like that!. I have an 86 chevy for 15 yrs. I wish you had more vids up

I wish I watched this video before spending all day trying to fix my defroster. Thanks for posting this, it saved me spending all day tomorrow on it too.

Thank you!!! You saved me so much work and frustration. I have a 79, found that black and gray hose coming out the firewall. Traced it to the ball and it was rotted off. Took me 5 minutes and didn't cost a thing. I already had some 5/32 hose laying around. Cut back the old hose to a good spot, slipped the new over it and then over to the vacuum bulb. You're my hero!!

Thanks! Because of this video I now have control of my vents again. My vacuum hose was super crusty and broken right where you said it was.

You sir are a hero, having this exact issue on my Electra and wasn't 100% if those were actual vacuum lines.

Dude I hope you read your messages.. Just want to thank you. I have the same setup and the same problem. And your video helped fix it !

Very informative. Been racking my brain trying to figure it out.

Thank you sir , great to be able to do it yourself .

Saved me a ton of time! Thank you!

Thanks for the video I took the box out to replace heater core once i got it all back together and heat working couldn't figure out why it was stuck on vent mode and wouldn't go to defrost now a little more knowledge of where it's powered hopefully will figure it out

I fixed mine in 3 minutes! Thanks, man, you helped me a bunch!!

I fixed mine in 3 minutes! Thanks, man, you helped me out.

I'm very grateful for your video. It was extremely helpful. Have a happy Thanksgiving and a merry Christmas.

Working on the same thing just before winter. Again! THANKS!

That ball is a vacuum reserve so when you go full throttle you still have vacuum and or if you're sitting with the vehicle off

Nice one for posting this video, I've got my truck sorted now 😉👍.

Nice presentation, thanks for sharing!

Thanks for the video I was having a same problem now I'll be able to fix it

Hi Tim Thanks for the great video. Helped me out alot!

Fixed my problem, Thank you!!

Fixed my problem thank you very much it is Friday February 19 2021 frozen Oklahoma City

Vato you are the man!!!

Thank you for this video!

Great video 👍

Thanks for sharing!!

thanks, now i know how to get mine working, at least how to check it

Thank you!

Thanks!

Awesome thanks 👍

Not all heroes wear capes!🫡🥹 thank you sir!!

exact problem I'm having with my 84 Sierra. no defroster. Will check and re do my vacuum line

thx, i have been trying to find where that hose is forever...

Where can I buy that vacuum line?

If this works…. I haven’t had controls in years and it was after I took my engine out I think this is it

"like magic"

That "ball" is the vacuum reservoir. It's the main component that operates the HVAC/cruise control.lol. I guess you can use the port you did,but the vacuum reservoir is the correct component