My first thought would be that there is air in the cooling system. If this van has the 3400 V6 engine it, there is going to be a bleed valve on the upper radiator hose housing, the second one is on the passenger side of the vehicle. Its on a tube that runs around the motor. Its going to be a black metal line. You want to crack the lower one first and bleed the air out. You want only a steady stream of antifreeze. Once the air is bled out of that one, crack the one higher up. Make sure there is a steady stream there also, refill radiator and overflow tank. While running and the cap is off of the radiator, check to make sure that the antifreeze is coming back out the top, the only concern I have is with it being a 3400 V6, the odds of it needing head gaskets are likely. Hope this helps you out some, let me know if there is anything else.
Wednesday, May 6th, 2015 AT 4:36 PM