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Old 11-17-2014, 06:03 PM   #1
brewerkz
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Default M42 engine to heater core routing (91 318i)

I continue to have issues with AC heat above 30 MPH. At idle or low speed I get plenty of heat. At higher speed, especially highway, I get cold air.

I am pretty sure I have the air bleed out of the coolant system.

I have red that having the hoses to the heater core mixed up can impact heating.

Should the hose from the cylinder head go into the upper or lower heater core port?

(I have the head connected to the upper heater core port, the block connected to the lower heater core port)
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Old 11-17-2014, 06:08 PM   #2
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