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Heat in cab increases with throttle?

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Old Jan 27, 2014 | 06:44 PM
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Default Heat in cab increases with throttle?

Okay, I searched for it, couldn't find it.

Recently did my water pump and timing set (and plenum too) because of leaky gaskets. Let lots of air in the system. Replaced the pump with a whole new unit, new 195 thermostat (verified with boiling water before install) and topped off the cooling system, burped it multiple times.

Still getting poor heat in the cab while idling (such as warm up in the morning), but noticed that when i give it some throttle, the heat comes to life. Toasty warm!

So, seems to me like I'm getting poor flow through the core, and flow improves when the rpm of the pump increases.

So, million dollar question: Time for a simple back flush? Or is more burping required?
 
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Old Jan 27, 2014 | 07:40 PM
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Bad heater core maybe?
 
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Old Jan 27, 2014 | 07:54 PM
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Still low on coolant. More than likely still have an air bubble in the core.
 
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