ECC only blows on windshield - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 07-10-2007, 12:22 AM   #1
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Default ECC only blows on windshield

on a 98 SE, yes I know how to work it
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Old 07-10-2007, 12:26 AM   #2
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First the quickest and easiest vacuum leak to find is the line that goes from the TB or just behind it to the firewall into a box next to the brake master cylinder. If often gets knocked off when doing spark plugs and such in the back. That box is the vacuum reservior the HVAC uses to control the directional valves.
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Old 07-10-2007, 09:33 AM   #3
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You can skip over John'* advice. While it'* good information..it only applies to 92-95 model years.

Most likely you have collapsed nipples.

http://www.bonnevilleclub.com/forum/...ght=hvac+vents

It'* a long read, it'll walk you through the diagnosis steps one by one..and then on page 6 if you still don't have vents... fix the collapsed nipples.
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Old 07-10-2007, 12:08 PM   #4
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Whoopsie...
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