Quote:
Originally Posted by jack1007
2003 s-10 ZR-2 4.3 4WD front wheels will not engage, light on dash 4Hi and 4 Lo light up and say they are locked but they are not. Heater is stuck on Vent. From all I've read the Transfer Case Vacuum Switch is pooched and it has allowed oil to be sucked into the Vacuum Activator under the battery which explains why it won't pull the cabel and engage the front wheels. Also fluid has been sucked into the Heater control and I've read 3 other things that all need replacing for the defrost/heater/vent to work correctly. What exactly do I need to purchase for parts and is there somewhere that explains the easiest method to access and replace them. I found a great write up on the TC Switch and 4WD activator, but nothing on the heater proceedure.
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First thing is to check for good engine vacuum to heater and 4W.
Look for any bad vacuum hoses rubber /plastic and fittings.
Does heater control have good full engine vacuum to it.