Astro Van 1998 Aircon and heating problem - AC Auto Repair Help Forum


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Astro Van 1998 Aircon and heating problem

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evinfolks
New User

May 4, 2012, 4:16 AM

Post #1 of 3 (2952 views)

Astro Van 1998 Aircon and heating problem	Sign In

I have a 1998 Chev Astro Pass Van and my Aircon and heating unit doesn't blow an air to the front. Air comes out only on the top(near windshield). Is anyone can help me please. Thanks for any help.

(This post was edited by evinfolks on May 4, 2012, 4:38 AM)

Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

May 4, 2012, 6:42 AM

Post #2 of 3 (2908 views)

Re: Astro Van 1998 Aircon and heating problem	Sign In

The mode selection is done through a series of air doors that are operated by vacuum. When there is either a partial or total loss of vacuum, the system will default to either defrost or on some vehicles, heat. Acceleration can also have an effect on the doors for the same reason.

Look under the hood for a small black plastic hose coming through the firewall. Follow it to the vacuum source looking for any breaks, cracks or leaks. Also follow any other lines that branch off because they may go to a vacuum reservoir (storage tank) and a leak there will cause the same problem. Using a vacuum gauge to determine if you have full vacuum at any given point is the best way to find it. You can cut into the line anywhere and splice it back together with a piece of vacuum hose. Find the broken line, you found your problem.

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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.

evinfolks
New User

May 7, 2012, 10:44 AM

Post #3 of 3 (2839 views)

Re: Astro Van 1998 Aircon and heating problem	Sign In

Thank you for your information.

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