The thermostat may be sticking open and not allowing it to heat up like it's supposed to.
There is an air pocket that may be in the heater core.
The water pump may be a problem.
What liter size is the engine?
Is the water pump new or reman?
Was the heat present before the work?
Did you overheat it at all, gauge going into the red?
Saturday, March 8th, 2008 AT 6:18 PM