1997 Chevrolet Tahoe Air Conditioning Pressure Valve?
You will have to evacuate the A/C system of it's freon to replace that schraeder valve.There is a tool that is similar to the one used on valve stems on tires that you might get and just try to tighten it first. That tool can be found at automotive A/C supply stores. Don't try to use anything else or you might mess it beyond repair. If you replace the hose you will also have to evacuate the system. I would try tightening it first. Also I've seen people just put a good o-ring under the cap that goes on it and tighten the cap real tight to avoid having to evacuate the system.
This is a very common problem and you will need to reclaim the freon and replace the service port only and not the hose, however you will need a special socket to remove it or you will damage the hose as well as the new valve......... After you are finished you will need to evacuate and recharge the system complete and dont for get to add refrigerate oil back as well.
you need to have one door for the Heater or AC Coil - and it looks such as you have checked that one and this is working - yet another for sparkling Air or Recurculate and there ought to be yet another vent door it extremely is 'positional' placing a million, 2, 3, for floor face defrost - or extra in case you have a million/2 settings. --- on some autos / autos, this is extra suitable than merely one door IE: one door for each placing (and those are a discomfort). It looks like that door is the two no longer getting vacuume or this is 'caught' (each now and then issues from the sprint crumple in there and stick the door) - Actuate the door consisting of your hand, do no longer stress it too annoying you are able to ruin the acuator or the door - if it strikes and not utilising extremely some stress then initiate finding on the vacuume to the actuator - additionally make valuable the actuator will carry its place (circulate it to any spot, lick your finger (to make a reliable seal) and placed it on the hose connection to work out if this is going to hold.) --Oh, so confident, there is yet another door you are able to desire to be finding for --
you can replace the valve--but when you take the old one out so will all the gas. If it just leaks a little the air tight cover cap should suffice to avoid this proceedure.