Thread: p0304 code and engine overheating!!!!!!!

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  1. #1 Re: p0304 code and engine overheating!!!!!!! 
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    I'm not loosing coolant that im aware of . Fans are starting in low speed then stepping up to high. I havent seen any bubbles except in the coolant res. Its over heating but never making it into the red the fans kick on around 210. It does however rise above that even when driving unless you are running around 70 then stays well below 210.
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  2. #2 Re: p0304 code and engine overheating!!!!!!! 
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    Have you Burped the system after your coolant flush? Air bubble maybe stuck behind thermostat... check around vibration dampner for moisture/coolant , i have the same car in the garage and also found usage of very small amount of coolant (not enough to worry about) over a weeks time.. but will overheat when idling
    i found the alternator bracket is also a coolant housing for the heater core hoses.. this housing plugs into the block(center of motor,a plastic 90*tube under blower pulley) and into housing that water pump is attached to. it may look like this--
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  3. #3 Re: p0304 code and engine overheating!!!!!!! 
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    I have not burbed the system. What is the procedure for burbing the system? Also should I run a cooler thermo?
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  4. #4 Re: p0304 code and engine overheating!!!!!!! 
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    on the thermostat housing there is a brass screw, warm up the engine and open the screw a few turns, when bubbles stop coming out and you get a steady stream of coolant shut the screw. top of the radiator.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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