Breakdown Posted July 22, 2008 Report Share Posted July 22, 2008 I don't think that this is ground breaking, but it is very hard to search for. It is normal for a W-body to lose all interior fans on a steep incline while at 75 MPH or so (highway driving), because mine cut out entirely, whimpered on again and then were fine. The way back, same thing, but they didn't die entirely (southbound hill wasn't as steep). Didn't seem to matter AC on or not. Looking for feedback or similar experiences, Thanks, Quote Link to comment Share on other sites More sharing options...
Fleeingpepper Posted July 22, 2008 Report Share Posted July 22, 2008 With your knowledge I'm sure you knew they didn't just switch to the floor vents because of a vacuum leak? And mine hasn't lost its fans while traveling on the bigger hills of the very hilly Oklahoma plains. Quote Link to comment Share on other sites More sharing options...
xtremerevolution Posted July 22, 2008 Report Share Posted July 22, 2008 With your knowledge I'm sure you knew they didn't just switch to the floor vents because of a vacuum leak? And mine hasn't lost its fans while traveling on the bigger hills of the very hilly Oklahoma plains. I used to have that happen, and always thought it was really weird. Then I found that my vacuum hoses were rotted to hell and broke off in little pieces when I tried to remove and replace them. oops... Quote Link to comment Share on other sites More sharing options...
meltboy1 Posted July 22, 2008 Report Share Posted July 22, 2008 that's funny cuz I was just about to post the same exact thing, I noticed this today on the way to my friends house. I think maybe it could be a leak or there just isn't enough vacuum while accelerating uphill... Quote Link to comment Share on other sites More sharing options...
Drummer Posted July 22, 2008 Report Share Posted July 22, 2008 I had to replace all the vacuum hoses and the valve the 3 or 4 hoses connect to, they were really dry rotted, could hardly bend the lines without them shattering. Quote Link to comment Share on other sites More sharing options...
88red4cyl Posted July 22, 2008 Report Share Posted July 22, 2008 Which vacuum hoses need replacing? My 95 Lumi always switches to the floor vents under acceleration... Quote Link to comment Share on other sites More sharing options...
mrl390 Posted July 22, 2008 Report Share Posted July 22, 2008 I would look at the vacuum line that goes to the bottle in the driver side splash liner. Quote Link to comment Share on other sites More sharing options...
jerry455 Posted July 23, 2008 Report Share Posted July 23, 2008 i put in a new blower motor on my friends 02 gtp. his fan would not run unless he hit a bump in the road ,then it would start. finally when i looked at it ,it wasn't working so i hit the bottom of the motor and it started. so we put in a new blower motor and no more problem. Quote Link to comment Share on other sites More sharing options...
cutty Posted July 23, 2008 Report Share Posted July 23, 2008 I would say one of the lines going to the vacuum ball has broken and or dry rotted. I hate the same thing happen in my cutlass and what i did was reconnect the plastic lines with a little rubber hose, and it has been working fine now for years. Quote Link to comment Share on other sites More sharing options...
alphagtp Posted July 23, 2008 Report Share Posted July 23, 2008 my cousin had a MC that did that, I always thought tha was normal wth hie 3100, I guess not Quote Link to comment Share on other sites More sharing options...
GutlessSupreme Posted July 23, 2008 Report Share Posted July 23, 2008 Supposedly the vacumm ball itself goes bad and leaks too. I replaced mine with a new GM unit. (this is the big ball behind the driver's side fender). but yea, definitely a vacumm leak somewhere. Quote Link to comment Share on other sites More sharing options...
Drummer Posted July 23, 2008 Report Share Posted July 23, 2008 It could be the line going from the t valve to the VCM behind the motor if that's what it's called, or even the valve itself Quote Link to comment Share on other sites More sharing options...
Fleeingpepper Posted July 23, 2008 Report Share Posted July 23, 2008 From what I've read and searched about the floor "issue" a while ago, the vacuum check valve goes bad quite often. Too bad I forgot where it was. I decided that if I was flooring it, I wasn't using the AC, and thus, the windows were down. Quote Link to comment Share on other sites More sharing options...
Drummer Posted July 23, 2008 Report Share Posted July 23, 2008 the check valve is near the battery, which is why my lines were shot, because at one time or another the battery went and took a shit and everything was rotting away that was near it. Quote Link to comment Share on other sites More sharing options...
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