water pump on 1996 Dodge Ram Van 2500

Ok so I have replaced sender unit, thermostat and water pump on this Ram Van. Still gets hot but not steaming hot. No heat coming out either. I pulled the water lines from the pump to the heater core. No fluid coming out of the line while idling. Hose may be plugged but unlikely. Question? Does the engine need to heat up enough before it sends water to the heater core?. I suspect that the heater hose will have water circulating from the pump thru the heater core always. Maybe the new pump is defective? Thanks.

by in Markleeville, CA on June 24, 2010
1 answer 1 comment
ANSWER by on June 24, 2010
there should be circulation at all times. did you bleed the air out of the system??? the no heat is not good. from the sound of your message, you have been running hot for a while. you may have done damage to a head gasket. the radiator may be clogged also, causing a no circulation issue. Roy
COMMENT by on June 24, 2010
Radiator has been replaced and is relatively new (couple years at most). Very clean inside. Coolant levels are stable. Have run the vehicle around the neighborhood and would expect any air pockets to have worked work by now. Engine heats to Hot fairly quickly. Could be an air lock. How to bleed this air out? Engine runs great with power and no white exhaust as a blown head gasket would indicate and no water oil mix going on. No heat as the water never gets to the heater core from what I am seeing. I still suspect the unlikley cause is a defective water pump that I just replaced.Ran garden hose thru lines and all clear. Then pushed on radiator cap and water began flowing thru heater hose. I will p/u a new radiator cap today.
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