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i have a 94 devile with the northstar engine. today on my dash the engine coolant hot was displayed and after 5 min or so it started to overheat..pulled over and saw coolant comming out of the overflow..my fan was working, so could it be a thermostat issue or water pump issue??? any thoughts on it would be great..thxs in advance...
 

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Belt tensioner, cap, purge line, thermostat are all potential culprits. Water pump is the least likely.
 
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