Not a problem. The upper rad hose should have a spring inside of it to prevent that from happening. Are you sure the thermostat was installed in the correct direction? Also, is this the 4.3 and not the 2.8? As far as a vacuum leak, I understand all the new hoses are new, but the intakes on the 4.3 from back then had problems with leaks. As far as the IAC, remove it and clean it. Have a helper turn the key on and off. You should see the pintel move a little. What happens is on a fuel injected engine, the throttle plate closes completely when you are off the gas. However, the engine needs air to run. That is where the IAC comes in. The pintel valve at the end allows metered air to enter the intake based on what the computer tells it.
As far as donating, if you can great. If you can't, please don't worry about it. We are here to help. Regardless, let me know what you find.
Wednesday, November 9th, 2011 AT 5:19 AM