David86 Posted Tuesday at 14:01 Share Posted Tuesday at 14:01 Hi to all, Hope somebody can please help me this one is driving me crazy. I have purchased this 370z with an overheating problem, I have replaced the thermostat and now removed It just for test purposes, I have drained and refilled the system múltiple times using all the bleed processes I could find (bleed screw on radiator, very slow filling, high burp funnel and vaccum filling), every time I refill I have bubbles coming out of the system mainly after light reving of the engine (run for nearly 3 hours and still have bubbles), assuming It was going to be a head gasket I have done 3 chemical tests all negative (one on the expansión tank, one on the main cap, and one with little coolant in the system on the main cap) Also tested the tester by putting It in the end of the exhaust and It changes colour instantly) Also disconnectd all pipes etc and blown through with compressed air in case of a blockage. Any help would be much apreciated and I apologize if this posted in the wrong section. Many thanks. Quote Link to comment Share on other sites More sharing options...
Keith D Posted 21 hours ago Share Posted 21 hours ago (edited) How long is a piece of string! Could be engine oil, pump.... could be rad, fans... could be rad cap... water pump, pulley / pump drive... could be many things. VQs run hot, has this suddenly started or slowly got worse? Have you recently done any mods or jobs when this started? And silly question but have you checked it is actually overheating and not faulty sender etc? You didn't say if your heater gets hot, when you filled the system and burping it. You want it on full, and if it's not getting hot you have an air problem. Thermostats you can check in a boiling saucepan and digital thermometer. Probably if it were me and based on what you've done so far (and assuming the engine has oil) I'd stick a temp probe on to confirm it's overheating and not a sender / gauge fault, and if so loosen the drive belt and give the water pump pulley a wiggle, then stick a pressure gauge inline to test water pump impeller. Edited 18 hours ago by Keith D Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted 13 hours ago Share Posted 13 hours ago When does your 370 reach an over temperature situation? Quote Link to comment Share on other sites More sharing options...
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