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Q: How do you replug vaccum line through firewall?
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Why doesn't the Suburban heater doors open?

Check for cracked vaccum line. Small line from engone compartment side through the firewall to the heater doors. The heater doors are controlled by vaccum.


1997 Buick Park Avenue the air just blows from the defrost vents and no where else What could cause this?

Usually a vaccum line falls under the hood, look for a line that's not connected, and reconnect. Usually these lines go through the firewall so that would be the place to look


Where is the map sensor located on a 1994 Dodge Shadow 4-cylinder?

Its located on the firewall... it is just sticking out, it has a 3 wire connection to it as well as a vaccum line coming from it.


How do you test a back pressure transducer?

make sure you have vaccum to the transducer, i believe there will be 2 hoses coming from the throttle body. make sure that the metal line that connects to the bottom of the transducer is not clogged with carbon. if you have vaccum and that line is clear, take the hose that goes to the egr vsv solenoid off the transducer and rev the engine up. if it is good you will have vaccum through the transducer, if its bad no vaccum will be there. <(")


Where is the servo motor that swaps the vent door from the cooling coil to the heater coil on a 1998 Oldsmobile intrigue?

Before looking for the servo check your vaccum line from the back of the engine it goes across the firewall down the passenger side-inside fenderwell, then und&er the battery and back to the lower firewall. Lots of Intrigues battery aicid eat this little black line into around the battery box. This creates no vaccum to the heat & air door controls.


Where is the PVC valve on a 1981 Camero v6?

There is no PVC valve.... It is a PCV positive crank vent. It should be located near the firewall in one of the valve covers with a vaccum hose attached. to check pull loose from valve cover and pull off vaccum line , then shake it. If it rattles its ok


How can you fix your heater vents on your 1996 GMC Jimmy; it only blows through the defroster regardless of which vent you select?

sounds like a vaccum line is off. Do you have an aftermarket stereo? I could also be the switch, but I would bet on a vaccum line, search for a diagram then go from there.


Where is the air conditioning line on a 2003 Chevy Trailblazer?

The 2003 Chevrolet trailblazer air conditioning line can be found on the air conditioning compressor. The line goes from the compressor to the firewall. The line will go through the firewall to the air conditioner core.


Why would no air come from the dash vents on a 1991 Ford Mustang even with the AC on?

Bad blower motor or bad fuse. Check the fuse first it is a cheap fix it is the problem. I Have 1996 Mustang and mine was blowing out the defrost and it ended up being vaccum line. 1/8 vaccum line located on the firewall I followed it across the engine to find, it broke from the boot it was plugged into. I pulled the old line out of the boot and plugged back in and it worked


How does the brake vacuum system work on a 1963 Chevy Impala If I push on the brake pedal I hear a hissing sound inside and the car stalls out?

If you have a power brake booster then there will be a vaccum line that runs to the brake booster on the firewall from the carburator. Check the booster for holes and broken fittings or buy a new booster. if no brake booster then brakes shouldn't affect vaccum


Air conditioning on 1992 Camaro only blows air out of defrost?

The control of vents on the Third Generation Camaro's is done with vaccum rather than via cable or electrical means. The problem is being caused by a vaccum leak either at the control unit or somewhere along the vaccum source line. Best check for leaks on both side of the firewall. Also, the control unit may need to be replaced. My Camaro had the exact same problem and it was a vacuum hose leak.


Why will 4 low engage and 4 high will not engage on a 1988 Chevy blazer?

This has a vaccum operated servo; you probably have a vaccum line that has come off to the transfer case.