I have a1995 jeep Cherokee sport that I just traded for they are a vacuum line coming out of the firewall beside the heater houses laying beside the fuse box does anyone know what it hooks to

 

Could be to the heater control valve or to the vacuum canister in the passenger side front bumper.

 

Small diameter grey line w/a 90 degree rubber end? If so it's the one to the dreaded heater control valve(inline with heater hoses near the firewall). Just make sure it's blocked off unless you still have the valve.

 

It's gray with a bigger black line on the end I think some of its missing they are another line going to the front canister at the bumper I checked and I have no heat

 

About 1/8" diameter? Got one of these inline with your heater hoses? I've only got 1 grey line.



As for no heat check your blend door to see if the cable is hooked up. Look up under the dash on the passenger side.

 

I don't have one of those pieces I'll check the door