Have a 2009 Subaru Forester XT 5 speed manual.
The cars temps are running high. 98c while driving at about 100km/h.
Temps will drop to 80c very quickly if the car gets into higher rpms. Ie 4000rpm.
Not sure what could be the issue.
New GMB water pump Thermostat verified working Cheap eBay alloy radiator
Car has been bled.
Additional Info: TO provide some further details about the car;
It had a recent shortblock replacement due to a overheat (Air lock)
The current up to date list of modifications/changes are as follows;
Currently 2.5 fuel tanks old brand new Subaru EJ257 shortblock ARP Head studs Reconditioned heads - Pressure tested and shaved flat. Genuine head gaskets VF 52 Turbo Upgrade (Stock was a TD04) Water pump replaced at time of build eBay spec Radiator (Currently swapped out to a genuine rad, more on this later) PCV Delete - venting to atmosphere for the moment. TGV and Air pump Delete Throttle body coolant ports blocked off
12.07.2018: Today I pulled out the eBay spec radiator and replaced it with a genuine used radiator (I have another project car that is the same except auto). I installed this radiator and my temps have dropped a bit, but I feel something is still not quite right. During my test drive, I noticed while going down hill with acceleration my temps would be approx 90c then drop down to 82c.
Once I began driving along, either straight road or up hill and the temps would climb back up.
Naturally the car will cool down coasting down a hill, especially in a manual with engine breaking spinning the pump quicker, but I put the car into neutral to see if the temps would go down still, they did. This never happened when I had the eBay spec radiator in the car. (and yes, naturally the car will heat up when driving up hill with more load on the motor)
The standard radiator is much smaller and holds quite a bit less then the eBay one.
There were no huge temp spikes during acceleration with this radiator on the test drive, another positive.
I did remember testing my thermostat, and maybe its a bit "lazy"? It didn't fully open till about 85-90c.
I have been considering putting in a lower temperature thermostat into the car for added piece of mind, but I just want to make sure that its not a radiator or flow issue before changing it out.
13.06.2018 Update: Drove the car again, noticed it was low in the coolant overflow bottle. Pressurized the system while cold before heading out. Was loosing a small ammount of pressure, nipped up a hose clamp and have started driving it again. I have now noticed there is only heat on the drivers side in the car, everything tells me its not likely to be a heatercore issue - how can it get only half hot...?