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VN VP VG Air con issue

wbrent666

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1991 VG 3.8L v6
My 1991 VG V6 has a problem with the air con direction changing from the face/upper vent setting to feet only under acceleration. Air blows cold just changes to the feet setting even when dial is set to face/upper vents. Not a major issue but it gets bloody hot up here in the Pilbara (especially now). Any tips or tricks of what to check for?
Thanks
 

losh1971

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Its some sort of vacuum issue. Start by checking the y peice under the bonnet near the throttle body.
 

hi_ryder

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Make sure the vac tubes behind the vent knobs havent come loose. Theres also a ball under the passenger side front bumper that stores vacuum. And the firewall vac hose has been mentioned, check there too.
 
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