'89 C4 Plenum hose line connections.
Thread Starter
Heel & Toe
Joined: Jul 2008
Posts: 17
Likes: 0
From: Glendale AZ
'89 C4 Plenum hose line connections.
I am trying to piece this back together... I can't figure out what attaches to the center [CORRECTION] bottom connection at the front end of the of the plenum on the passenger side.The recommendations from below suggest that this is a hose line from the firewall near the heater core... is this correct?
Last edited by Ripps; Nov 1, 2008 at 05:48 PM.
Burning Brakes
Joined: Feb 2008
Posts: 988
Likes: 7
From: Sarasota Fl
On my '91 L98 there are 3 ports at the REAR passenger side of the plenum. I don't have any at the front passenger or driver's side. I don't think GM would have changed the plenums that much in 2 years, or did they?
If you do mean the rear, I can get a picture for you.
If you do mean the rear, I can get a picture for you.
Le Mans Master
Joined: Aug 2000
Posts: 8,838
Likes: 31
From: Australia
Originally Posted by Ripps;1567680526..
what attaches to the center connection at the front end of the of the plenum at on the passenger side.
Top is to pass side rocker cover
center is vac pipe to drv side front wheel well
bottom is water hose
Burning Brakes
Joined: Feb 2004
Posts: 829
Likes: 39
From: sun prairie wi
I am trying to piece this back together... I can't figure out what attaches to the center [CORRECTION] bottom connection at the front end of the of the plenum on the passenger side.The recommendations from below suggest that this is a hose line from the firewall near the heater core... is this correct?
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Team Owner
Joined: Jan 2003
Posts: 20,324
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From: Summerland B.C. Canada
I am trying to piece this back together... I can't figure out what attaches to the center [CORRECTION] bottom connection at the front end of the of the plenum on the passenger side.The recommendations from below suggest that this is a hose line from the firewall near the heater core... is this correct?
Racer
Joined: May 2006
Posts: 426
Likes: 16
From: Concord CA
That is the hose that comes from the heater.. it connects into the TB as to warm and heat the TB.. you can bypass (known as T/B bypass free mod). On the front of the T/B, there should be aport that connect to the intake maniold.
