Check the radiator if its clogged and water pump if its pumping coolant thruout the engine-if all okay -Get it block and pressure tested
January, 8, 2011 AT 1:58 PM
Are you losing any coolant over time?
January, 9, 2011 AT 5:50 PM
The water pump is in working order the van overheats almost right away a half mile or so. The van wasn't overheating prior to heater core replacement. Radiator forcing fluids into overflow. Thanks for the help.
January, 9, 2011 AT 5:56 PM
That likely means that you overheated severely earlier and now have a blow head gasket. Just make sure the thermostat isn't stuck or in backwards and you got all the air out of the system.