Tretch

I have a 94 vette that I have owned for five years. It has close to 100,000 miles but is a great car. A couple of weeks ago, I was driving along on the highway an tried to set my cruise control and nothing happened. It had been working fine before then.

I told some of the members in my club about my cruise control problem and was told to check my vacuum hoses as they may have cracks in them or may have come loose somewhere. In the meantime, I turned my air conditioner on this weekend and the cold air only blows through the bottom vent and not the top.

Is this a typical sign of bad vacuum hoses and they need to be replaced?

Thanks for your help.

Red Dwarf

Check under the pass/side fuel rail cover. There are vacumn lines & a valve that may be busted. Here's a picture of the items.

Redeasysport

The other main issue with the cruise has to do with the switch just above the brake pedal. It is a vacuum release and if it slides too far back it does not re engage. The solution is to pull the hush panel ,push the pedal down grab the switch and pull it towards the firewall.You will hear some clicking as you do this. Release the pedal and slightly pull it back to the normal position to set the switch. Don't pull to hard on the pedal as there may be some play in it you are only trying to get it back to the spot it will sit at when you take your foot off.

LT1 Spirit

I had the same two problems. I fixed those lines and a small hose on the other side and now I have cruise and air from floor ,vents, and the dash

Tretch

Thanks guys. I have done what you suggested and it solved my problem. You guys are the greatest. I really do appreciate your help.

Redeasysport

And what did you do one or both?

Tretch

I only had to replace the cruise control check valve under the fuel rail on the passenger side. I got the part from the local Chevrolet dealership parts department. It cost me every bit of $1.60 plus tax. I am going to buy several.

wascan

I also have similar problem with cruise control and intermittent air conditioning settings. Sometimes the air controls work properly and sometimes not. I replaced the vacuum check valve, but this did not fix problem. Where would the next place to look be? If both systems are affected does this suggest looking at the vacuum lines at a particular location. Thanks.

LT1 Spirit

I dont have pics but on the other side under the fuel rail cover closer to the front there is a small 3/8 hose with a bend in it that goes from the intake to a small block with wires coming out of it. That is what my problem was. good luck