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cracks in plenum on 3.8


homey1
10-03-2007, 03:03 PM
1986 olds 88 3.8

any one hear of cracks in plenums on this engine i suspect air getting into plenum and displacing the coolant and not letting the fan switch work?

guitarsandcars88
10-03-2007, 03:08 PM
Its entirely possible.

maxwedge
10-03-2007, 04:03 PM
Not on an 86.

guitarsandcars88
10-03-2007, 04:20 PM
My bad, I read that as 96...

maxwedge
10-03-2007, 06:54 PM
The plenum deteriorates at the egr passage allowing coolant to enter the engine, don't know how this affects the fan " switch," the pcm commands the fans on at 222 degrees based on the coolant temp sensor input and subsequent activation of the fans thru relays.

robert paulsen
10-25-2007, 07:27 PM
Please check out a thread I started a few years ago. There may be some useful information for you (or someone else) in that post. (scroll down a bit once you go to the link below) :)

http://www.automotiveforums.com/vbulletin/showthread.php?t=409718

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