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no 4x4 and hvac stuck on defrost only

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Old 12-13-2010, 06:44 PM
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Exclamation no 4x4 and hvac stuck on defrost only
My 99 is not shifting into 4wheel drive and all it will do is blow air throughthe defroster, my assumption is a vacuum pump is pooched? please advise if i have any clue what im talking about or not
thanks guys
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Old 12-13-2010, 07:49 PM
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Check all your vacuum lines carefully.Some of those lines are very small and hard to see a break or crack in them. Not very often the vacuum pump goes...
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Old 12-13-2010, 08:05 PM
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yes find the vaccume malfunction.

CAD actuation and blend door are direct functions of vaccume
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Old 12-13-2010, 09:27 PM
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ok, I'll see what i can find for rubbed cracked lines tomorrow and report back if i need further input, thanks guys
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Old 12-14-2010, 10:56 AM
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there is a vacuum line on the firewall, near the center, up high under the trim that I've knocked off and gave me similar symptoms.
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Old 12-14-2010, 11:31 AM
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Take care of that CAD with a posi-lock kit. It's awesome!!
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Old 12-15-2010, 01:14 PM
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as dumb as it sounds the line coming out from the pump either fell off or it was never hooked back up after the injector pump got replaced (why they would have taken it off is beyond me) haha
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Old 12-15-2010, 02:46 PM
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Nice whens its an easy fix!! Glad you firgured it out!
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Old 12-15-2010, 09:32 PM
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Originally Posted by 13FOX
Nice whens its an easy fix!! Glad you firgured it out!
me too its not the best weather to not have floor heat
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Old 12-18-2010, 11:06 AM
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Especially where you live!
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