Adam B Posted December 6, 2017 Share Posted December 6, 2017 Car overheated, needle in the red. Bottom Radiator hose cold. Stuck thermostat. Removed and tested in pan of boiling water. It barely opened about 2mm. Bought a new one from Nissan (then seen the Cosworth ones for same money) Twice now car has gone into red before thermostat opens and temps drop. This morning it didn`t open at all. What else would cause the thermostat to stay closed? Thanks Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted December 6, 2017 Share Posted December 6, 2017 If the thermostat does not open at the correct temperature then you have a faulty thermostat. Just because your gauge is hitting the red does not necessarily mean that you have a faulty stat. I would start with bleeding the system and getting ALL the air out. Also, check that your fans are kicking in. Quote Link to comment Share on other sites More sharing options...
Adam B Posted December 6, 2017 Author Share Posted December 6, 2017 Cheers alex, Fans kick in but temp keeps climbing due to no flow through thermostat. Changed the coolant when thermostat fitted. No air in system as far as I`m aware. I am assuming my new stat from Nissan is ok . I am using MotorFactor (Granville) coolant, are there different grades of coolant? Quote Link to comment Share on other sites More sharing options...
ZMANALEX Posted December 6, 2017 Share Posted December 6, 2017 I think that you are grasping at straws mate. Run it without the stat and report back. Quote Link to comment Share on other sites More sharing options...
Adam B Posted December 6, 2017 Author Share Posted December 6, 2017 Lol, trying to fix it on the internet while stuck in work. Cheers Quote Link to comment Share on other sites More sharing options...
Adam B Posted December 6, 2017 Author Share Posted December 6, 2017 Just been out on break to have a look and just as the Z guru Alex had forseen I had created an airlock when changing thermostat. Bled plug out and topped up, all is well. Doh! Quote Link to comment Share on other sites More sharing options...
The Chubby Ninja Posted December 6, 2017 Share Posted December 6, 2017 Don't worry it's happened to us all buddy. The coolant can be a bit of a nightmare until you get the hang of it lol Quote Link to comment Share on other sites More sharing options...
Adam B Posted December 7, 2017 Author Share Posted December 7, 2017 Must of changed it ten times over the years on these z's, never had a problem. The trick is to pour really slooww. Allowing the air to escape, I rushed it and paid the price. Quote Link to comment Share on other sites More sharing options...
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