Re: van will not when hot 1997 gmc savana 1500, 5.0
Could be the battery and starter solenoid. Solinoids often heat up and can't make the required electric connection until they cool off.
Or, the battery can't hold a charge due to faulty alternator or other electrical parts. The only other thing I can think of is the head gasket or cooling sustem is bad allowing an overheat to take place and the moving engine parts lock when hot.
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look under the hood on the right side where your brake fluid is..There is a black box to the farest right of the brake fluid. take off the lid to this box were you will find fuses..Reach in and feel the fuses to see if any are loose.The largest fuses in the front, push down on those and then try to start it up..Take them out look at them make sure there ok if this dont work..they the one bad might need to be replaced..
could be a bad fuel pump, or fuel pump relay. they are having problems(a lot) with the ethanol in the gas on GM products.Fuel pumps sales are through the roof at parts house on GM's. Have a pressure check on your fuel system. That is probably it. Add a can of Seafoam to your fuel every 3000 miles to alleviate this problem.
you might have a problem with the iac valve (intake air control) it could have debris need to remove and vary carefully claen it with brake and parts cleaner but before you do this there is a simple way of checking it.wiht your car turned on have somebody step on the brake wile you bang on the iac valve with a wrench or screwdriver,if you notice a change in the engine most likly it is the iac valve.