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Old November 22nd, 2008, 07:18 AM   #9
Kodiak450r
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check coolant level first. low coolant will make it not have heat and would also cause overheating if low enough. one main concern i'd have is a cracked head. seen a few 4.0's with cracked heads or blown head gaskets. not a bad enough leak to cause it to run like crap but the engine would pump air into the coolant and force it out of the overflow. heater core is pretty high in the system so thats where the air would go in the system.
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