Where heater vacuum lines

That would be the vacuum line going to the heater/AC control head, so you could pull out the HVAC controller, find the main vacuum line coming from the engine, and splice, with new connectors and new line as needed, the line back together.

Sounds like you probably have a bad vacuum line on the back of the heater control. If you remove the heater control from the dash, you will find a vacuum hose cluster attached, you may either have a vacuum line that has come loose or one that has a hole in it. If you don't find either of these problems, then you may have a bad heater control, but I would look for a bad vacuum line first.

The blend door is probably what is keeping the air from blowing across the heater core and picking up the heat. I hope your manual gives a description and procedure for it.

The blend door actuator and other heater case doors will be either vacuum operated with a few canister diaphragms situated around the heater case, or they may be operated with electric motors. If you pull off the lower sound insulator panels below the dash, you can see the bottom of the heater case, and then find the actuator for the blend door. If vacuum operated, check for vacuum. The vacuum for the heater/AC controls comes from a single line from the engine, through the firewall, and into the back of the control head or to a control module. Then, many vacuum lines branch out from this central point to the canisters- the heater/AC controls will direct vacuum to appropriate actuators, or servos.

It sounds like vacuum is not getting to the vent, heat and A/C controls. Find the vacuum can. It may be under the hood on one of the inner fenders. Trace the lines back to the vacuum block at the intake manifold or fire-wall, and also back to where the line goes thru the fire-wall. Check the can for leaks or obvious holes. They used to be just a plain metal can, but it could be a plastic ball. Check the lines as you go for breaks and rub-thru's. Move the controls thru all settings and listen for vent door movement. (Run the engine momentarily to build vacuum in the system.) Worst case is a bad vacuum motor or air flow position selector switch.

The Intrepid doesn't have a vacuum line. It uses a electric motor called a "blend door actuator". It's located on the underside of the heater box near the center of the car.

LOOK UNDER NEATH VECHICLE ON LOWER BACK FIREWALL WHERE HEATER CORE HOSES RUN ON THE PASSENGER SIDE LOOK FOR SMALL EVAPORATOR DRAIN HOLE. TAKE A SHOP VAC AND SMALL VACUUM LINE HOSE ABOUT 3/8 SIZE VACUUM IN THE DRAIN HOLE THAT WILL REMOVE DEBRIS THAT BLOCKING OFF DRAIN HOLE WHICH KEEP EVAPORATOR WATER LEAKING INSIDE CAR.

yes you can. You will need a pair of pliers a thin rag one that is not to bulky. and a piece of vacuum line. like the vacuum line on your car. small. well first you need the replacement bulb get at dealership it is small. that will be the size of vacuum line you need. with the pliers carefully pull off your fan speed knob you will see the bulb back in the hole. take the vacuum line push onto the bulb twist line and pull it should pull the bulb out. then put new bulb lightly into vacuum line look at the slots where the bulb goes you will need to line up the bulb should be straight up and down. push bulb in you will feel slight click then reverse the way you turned the vacuum line to pull out just the line. and you should be good make sure the bulb lights up before you put the knob back on. good luck

The air diffuser is actually a vent where air inside the car gets forced out when the blower motor is running. It's usually behind the rear bumper or the trunk area. It's like blowing up a paper bag that has a hole in the end to let air out.

The vacuum line comes from the engine manifold and goes through the firewall to the heater control head. There is also a tee in the line that branches off to a vacuum reservoir that provides vacuum when going up steep hills, so the system does not default to defrost.

I tried to give you a vaccum diagram but the manufacture will not release that info to outsiders. you need to find where the hose goes to.if you loose vac to the controls it goes to defrost mode.

it is the control unit or a vacuum line off the back of the control unit remove the unit and check for vacuum lines off the back and check the vacuum lines under the hood first