[GMCnet] plastic plenum on the pass side firewall [message #112913] |
Mon, 24 January 2011 10:44 |
Gary Worobec
Messages: 867 Registered: May 2005
Karma:
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Senior Member |
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Hi,
On the passenger side firewall right above the batteries is a black plastic plenum with a vaccum assist cannister on it that is pop riveted to the aluminum firewall. If I cut into this with 2 1/2" heater duct will this feed the cabin heat or is this for the windshield defrost.? I took out the OEM heater a while back and now want to add an auxiliary heater back in.
Thanks
Gary and Joanne Worobec
1973 GMC Glacier
Anza, CA
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