Cooling/Thermostat

[Adam B]

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 

[ZMANALEX]

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.

 

[Adam B]

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?

 

[ZMANALEX]

I think that you are grasping at straws mate.

Run it without the stat and report back.

[Adam B]

Lol, trying to fix it on the internet while stuck in work.

 

Cheers

[Adam B]

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!

[The Chubby Ninja]

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

[Adam B]

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.