Chev astro a/c climate control vacuum line location

Ronny Bennett Sr.

• 6988 Answers
• Posted on Jun 28, 2009

SOURCE: I have a chevy astro van that has a broken heater vaccum line

some of them are dummies they are not vacuums,but if it is a vacuum line is it color coded?

raj somaiya

• 2272 Answers
• Posted on Sep 27, 2010

SOURCE: 1998 Chevy Astro: HVAC

Carefully identify the vacuum line(s) attached to the intake manifold to look for a leak.Your problem is located where the rubber air inlet meets the engine throttle body. Look under this rubber inlet and you will find a black plastic vacuum line. It has a hole in it or is just falling apart. Replace this line from the intake manifold to the tee up by the A/C accumulator/dryer.
--------------------- If the fan motor works but the location of the airflow can not be changed, the blend door motors or vacuum solenoids must be checked for operation. Pull the glove compartment box out and the motors or solenoids will be visible. With the engine running, move the controls and watch for them to move. If they fail to swing the arm for the doors to open, check to see if they are getting power or vacuum. For power check with the circuit tester, and for vacuum simply pull the line off and check for vacuum problems. If there is no power and the fuses are good, then the control unit on the dash is bad. If there is no vacuum, check the vacuum source--a small vacuum line running through the firewall to the engine manifold or into the power brake vacuum booster.------------ The HVAC splitter operates on vacuum. The vacuum line from the intake manifold to the solenoid that operates the air diverters must be loose,cracked or kinked.You should be able to find the line from the front of the vehicle with the hood raised. It's a 1/8" black plastic line that travels from the intake manifold on the drivers side up forward to where the a/c unit is located. --------

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