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Discussion Starter #1
hi guys, having a problem with the heater on my 2004 f250 6.0. heats fine until it gets below 30 degrees or so, then it is like the air conditioner is on. blocked the radiator, did not help. no heat at idle whatsoever,get a little under hard acceleration,and when going up hills. heater hose is hot going into cab so it must be inside somewhere. any help would be appreciated. thanks guys
 

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check your coolant level....mine did the same thing, and was low on coolant
 

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must be in the heater core. maybe something is plugged up. Or your selector switch is not switching
 

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Discussion Starter #5
i thought it might be the heater core as well,dont think its switches becouse everything works normally until it gets below 30ish. thanks
 
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