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Discussion Starter #1
After replacing the coolant in my Np300, the heater is only blowing out cold air, I think there’s air in the system, Andy advice on how to bleed it
 

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Hello, welcome, Mat.

Heater core is likely to be full of air. Not sure of the bleeding procedure with D23.

Someone will be along with it in a minute.
 

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Discussion Starter #3
Hi...Thanks for that, im hoping someone will come up with a solution, Ive tried bleeding from heater bleed pipe and top bleed pipe but there must still be air in there......i guess there’s a sequence to follow.....
 

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And you have run the truck right up to temperature? How long/far has it run since coolant change?
 

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Discussion Starter #5
ive run the truck up to temp, Ive not moved it since changing coolant this afternoon
 

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Discussion Starter #7
That seems to have done the trick....heater is working fine now and after a run the engine temperature gauge remain as before, just below half way...thanks for your help, its forums like this make life so much easier and cheaper...cheers.
 
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