chris71 Posted December 21, 2015 Share Posted December 21, 2015 this has never happened before as i was driving home from work last night . i had the heater on vent when shifting into 5th gear the heater switched to defrost for a couple minutes? i've never noticed this before also i haven't had time to look at till tuesday when i'm off work , i'm thinking it prolly a vac problem but not sure . so i'm wondering if anyone has had this issue before and maybe a place to look and see where the vac leak may be at. any advise would be nice to narrow down where to look . i'll have the dash apart tuesday to change the gauge cluster from idiot lights to gauges , so i'll be able to check the vac lines in the dash at the same time thanks, chris Link to comment Share on other sites More sharing options...
shelbyluvv Posted December 21, 2015 Share Posted December 21, 2015 There is a vacuum ball behind the passenger side front bumper. Check there and look the line over very well all the way to the intake. Link to comment Share on other sites More sharing options...
chris71 Posted December 21, 2015 Author Share Posted December 21, 2015 thanks i'll check Link to comment Share on other sites More sharing options...
bodukexj Posted December 27, 2015 Share Posted December 27, 2015 Classic vacuum problem. Check, check and recheck the vacuum lines. I usually just run a direct line from the manifold to the heater control panel. (It's a safety thing; all vehicles are set up to failsafe to defroster if they loose vacuum- you don't need cabin heat, but you do need a clear windshield!) Link to comment Share on other sites More sharing options...
cruiser54 Posted December 27, 2015 Share Posted December 27, 2015 Link to comment Share on other sites More sharing options...
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