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ok here is a strange one that started mid road trip. vehicle+ 1993 K1500 Suburban with the 350 /auto tranny/4x4 (do not think it is model suspecific) the suburban has 300990.90 miles and running great, but this last weekend we went on a 300 mile B-day road trip. after the 2/3 of the trip was compleated we stopped for dinner and when we started the burban after dinner it made a clicking sound from low behind the pass heaterbox (sounds like a relay cycling (it sped up last night) or a broken power antenni motor) it last for 30 seconds and now does it when you start the motor and turn off the key both times it will go for 30 seconds and stop. i can drive for any time after and there seems to be no performance issues. the cruse control works all wipers, windows work. we had this truck for 3 months and the only things i done so far was oil,filter and lube and replaced the back-up neautral switch on the steering column. the only thing that gone strang is last month the ac stopped getting the compressor signal so no AC (i was looking into why but the sons Bday trip was right in the middle. any ideas? would this be like the only thread i found the multi function switch? thanks..i am just learning this beast ....mike