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should be under your hood on the edge where the radiator is there is a few diagrams there timing settings vacume hoses etc if they are gone just use your search engine on images intesd of web it will pop right up
truck normally has a vacuum hose routing diagram on under side of hood on drivers side.also look for metal tag on center of engine compartment fire wall which gives you a motor id @ and trk model # you can then know what engine vacuum diagram you need.i have a diagram for an 86 720 series Z24 carb engine that can be copied off of truck..chris
do you have a source of vacuum? normal problem occurs on the vaccum line from the engine to the vacuum switch of the car. unplug the vacuum hoses from the rear of the switch and feel if there is hose that is sucking your finger. if there is none, then trace the line towards the engine firewall out to the engine compartment. it could be broken that is why it is stuck in defrost mode.
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