cracks in plenum on 3.8

[homey1]

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]

Its entirely possible.

[maxwedge]

Not on an 86.

[guitarsandcars88]

My bad, I read that as 96...

[maxwedge]

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]

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/vbul...d.php?t=409718