Question about 1998 Dodge Ram 1500 4WD

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98 dodge ram overheating with no heat

I have 1998 dodge ram 1500 with a 318 it was recently leaking from the water pump I changed the gasket and checked the pump. Now its not leaking but when driving overheats very rapidely, not when idling, and when it overheats it leaks antifreeze from the heater line right at the pump, its also not getting any heat, there was no heat issue b4 could it just be the thermostat or is the likely culprit the water pump itself

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  • 2 more comments 
  • natalie79ca Jan 20, 2009

    no I

  • natalie79ca Jan 20, 2009

    no i

  • natalie79ca Jan 20, 2009

    no i didn't

  • Patrick Dennehy May 11, 2010

    These heater cores have been known to clog easily, as do older radiators that haven't been flushed regularly. Still, the Thermostat is a good bet. Watch it run and when it starts overheating, check to see if the hose coming out of the thermostat housing and TO the radiator is hot or cool. If the stat is stuck closed, the hose will not be hot.

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  • Dodge Master
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Did you have your heater running when you refilled coolant after water pump changed?

Posted on Jan 20, 2009

  • Mike Butler
    Mike Butler Jan 20, 2009

    You most likely have an airlock in the system, so try this with engine cooled off. Remove rad cap, top up coolant 1" or 2" from top of rad & start engine. Turn heater on (not defrost) and let engine run, and top up coolant as needed. If yours has electric rad fan (I assume it does) let it run until temperature gauge reaches normal operating temperature, and rad fan kicks on, then off. Let it do that 2 or 3 times, and every once in a while rev the engine a little for 10-20 seconds, just to improve/increase flow. After 2 or 3 times rad fan comes on & off, replace your cap & give it a try.

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