Have a black hose hanging from the rear end of my truck with a plastic nipple on the end. Cant find where it goes or what it is for

\look at the passenger side rear fire wall inside your engine compartment you will see a big plastic heater control valve that all the hoses front and rear heater hoses hook up to that one plastic valve find the two hoses that lead off towards the rear of the body of your suburban ten take tem off and buy a short piece of 5/8 or 3/4 hose and connect those two empty nipples together and make sure you hose clamp them together tightly so they dont leak and overheat your truck ok

coolant line for rear heating of the truck find out if they can be connected. u may see a nipple where the hose goes if so replace with a rubber heater hose. if nipple broke get new box from junk yard, buy new hoses and clamps and reconnect. you may need a/c rubber rings for the two ac lines. remember if replacing the box car should be cold your dealing with coolant. and release pressure from the ac lines before servicing

Remove the clamp on each end of the hose, then carefully twist and wiggle the hose, till it loosens from the nipple it is attached to. use care not to break the nipple off. (most radiator fittings are plastic) Sometimes it's easier to just slice the hose with a single edged razor...after all, you aren't saving the hose...right?

that is the breather hose for the rear axle, it should be secured to the cross member over the rear axle, it does not plug into anything

hi this is air in the system if you pump them do they go hard as normal? what you will need to do is , starting from the furthest caliper away from the fluid bottle you have to bleed the air out, you can buy bleeding systems for a few bucks/pounds but you can also do it yourself, to do this, find a length of small bore clear hose/pipe, locate the bleed nipple on the caliper, find a wrench/spanner that will fit the bleed nipple, put that on first, then get your pipe/hose, and slide that over the end of the bleed nipple ( make sure the pipe/hose is a nice tight fit ) locate a small clear glass jar partly fill it with brake fluid, put the hose/pipe into the jar so the fluid covers the end ( we don't want air to go up the pipe/hose ) then get a friend to pump hard on the brake pedal till it goes hard, and when it does tell them to keep their foot hard on the pedal , you then undo the bleed nipple ( you should get some fluid come out fast) when the pedal reaches the floor ( this happens immediately if you have opened the nipple far enough, then when it has hit the floor do the bleed nipple up again before they raise the pedal keep doing this till you see no bubbles coming through the hose/pipe, repeat the operation on the next furthest away, and so on till all the air has been removed from the system, be sure to check the fluid in the reservoir regularly as this will cause air to get back into the system again if it runs to low....hope this has helped and good luck, please vote thanks

right hand side of the engine under the cowl you will see a vacuum reservoir( black plastic canister) on it a small nipple from which your vacuum hose shld. be connected.The hose shld be connected on the upper side of the reservoir used your finger tip to locate the nipple

If you don't see any line that should be attached to that port just plug it with a vacuum cap. The cap usually pops off when cranking the engine and the engine starts and stalls resulting in a backfire in the intake. If you don't have a vacuum cap, plug a piece of vacuum hose with a screw and put the other end of the hose to the open vacuum port.

junk yard

the hose is prob your air susp hose, it goes to the metal line on your rear end right above the drivers side rear wheel, or you can look for the air bag and track down the lines and where they go, sometimes they are in the middle and have a Y fitting

The plastic line in the wiring harness goes to the heater controls; and believe it or not , the other end goes to the vacuum tank - but its in the FENDER !!!!! behind the ABS, kinda under the drivers side hood hinge - great place to put one ain't it ? No wonder GM is going broke !! Good Luck