RichCox350Z Posted November 18, 2015 Share Posted November 18, 2015 Hi guys, Been reading through a few posts on here from other members regarding the overheating issue the 350Z DE sometimes suffers from. So to run through everything that's been checked: Fans - both working normally, with or without use of AC Dial - reading correctly Thermostat - opening/closing as it should Air Flow - good, not being starved Cockpit Heater - behaving normally and hot air coming through regardless of rev range. Driveway - flat and level, very rarely parked on a slope Water pump - fine. Behaving normally. Still having a problem with overheating. Garage has had it for the day and bled the valve through to the point of the coolant free-flowing. Done a block test and fluid level test and everything is sound. Mechanic is stumped, so am I. Only thing I did notice last night when I went to drive it, upon start up I could hear a rushing sound of water behind the dash.. leading me to think that there is still air trapped in the heater matrix? So question is... Do I attempt another session of bleeding it with heater on low, squeezing flow/return pipes and see what happens? Or does anyone else have any suggestions? Thanks for any help in advance! Rich Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted November 18, 2015 Share Posted November 18, 2015 (edited) When does the car overheat ? Sounds like you still have air in the system. What bleeding procedures are they following ? Edited November 18, 2015 by ZMANALEX Quote Link to comment Share on other sites More sharing options...
RichCox350Z Posted November 18, 2015 Author Share Posted November 18, 2015 When does the car overheat ? Sounds like you still have air in the system. What bleeding procedures are they following ? After driving for about 15-30 minutes. Temp gauge starts rising, causing me to pull over and wait. I honestly couldn't tell you what procedures they followed. However I will say I thoroughly trust the garage, they've always done work on all my families cars so I'm confident in what he says he's done. I know that doesn't help much! Lol Quote Link to comment Share on other sites More sharing options...
veilside z Posted November 18, 2015 Share Posted November 18, 2015 They might of just squeezed the radiator and heater pipes. There is a bleed valve towards the rear of the engine, a lot of people are not aware of. Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted November 18, 2015 Share Posted November 18, 2015 (edited) Have they tried flushing out the coolant lines and back flushing the radiator ? If all you say is correct then it really has got to be a blockage of air or foreign material. Have you tried running without the thermostat ? Have you checked the vanes on the water pump ? Remember that the proper bleed system must be followed to get all the air out, so best refer to the Nissan 350 workshop manual for that. Edited November 18, 2015 by ZMANALEX Quote Link to comment Share on other sites More sharing options...
RichCox350Z Posted November 18, 2015 Author Share Posted November 18, 2015 Thanks chaps I'll get back to you after I've double checked everything! Quote Link to comment Share on other sites More sharing options...
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