89 cavalier

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piesquared

Golden Member
Oct 16, 2006
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Has anyone ever owned or worked on an 89 z24? i just got this thing as a project and the heater is stuck on heater and won't switch to defrost and it's -30c outside. i ripped the control out and the vacuum lines look fine behind it, but i can't for the life of me find where the darn vacuum lines come through the firewall. does anyone know if there is a heater control vacuum modulator in the engine compartment or if there is just a cluster to fan out to individual vacuum lines, and if so where it's located? can't find the bloody thing anywhere! :(
 

Regk

Senior member
Apr 14, 2009
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Probably a cracked L or T fitting on the line, my 95 firebird had a similar issue. a chiltons or haynes manual would be a good help to you.
 
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