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My engine is hot after 40 min. & won't start?? on 1998 Cadillac Catera

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I've replaced the starter, valve cover gasket, serpentine belt, ect... Don't understand why it runs hot & won't start for sometimes over an hour?? I'm a female & don't need to be dead in the water in the middle of the night..
(1) Answer
have you checked the radiator cap? if this is leaking or won't hold the pressure it tends to overheat. a new one doesn't cost much maybe 12-15$.