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Automatic hubs only engaging with ac turned on?

PostPosted: Tue, 28 Aug 2018 12:56 +0000
by Livinlrg
Hi,
I have a 1999 sr5 since I have owned it the automatic hubs have only engaged with the ac on. Now they have stopped engaging and the ac doesn't work? I'm not a mechanic but think it could b the vacuum valve shift solenoid as my brakes work fine and there seem to be a lot of vacuum when I removed the brake booster vacuum line, any thoughts?