Running cold

[M3powerzz]

Is my car running too cold, the needle is close to the first dot, sorry for the bad quality pic. This was highway driving. Outside temp was 61 according to the dash.

[c watson]

Yes, it’s running a little cooler than it should. You should try bleeding the system first. If it still runs cool after that then replace the thermostat.

[M3powerzz]

Ok thanks, will do.

[heinzboehmer]

There won't be much to bleed. Expansion tank is the highest point in the cooling system on our cars, so the system will self bleed.

[Shonky]

Read coolant temp via OBD. Pretty hard to really tell from that photo but should be fairly close to the middle. Coolant temp is even available in BlueBus if by chance you have one.

[Slideways]

The coolant sensor under the intake manifold is what is reporting temp to that gauge. They can go bad and won't always throw an error code. It is much easier and not as messy to replace that sensor versus emptying most of the coolant to replace the thermostat. Once the sensor is ruled out, then time to move on to the thermostat.

[M3powerzz]

I will check the temp with a scanner and let you guys know what it reads.

[sapote]

I will check the temp with a scanner and let you guys know what it reads.

and compare it to the temp value from the hidden menu.

[M3powerzz]

So I check the hidden menu and the scanner, both read the same, around 170-173 f.

[sapote]

So I check the hidden menu and the scanner, both read the same, around 170-173 f.

The hidden display shows 79C which is 174F. I think the Tstat opened too soon or leaking.

[M3powerzz]

I'm going to change the sensor under the intake manifold and see if that helps . I did change a hose a month back, so maybe air is still in the system.

[M3powerzz]

Just change the coolant temp sensor. Now on the intake box, I see a small hole at the bottom. Is something suppose to be connected there?

[Mr.wReckless]

Just change the coolant temp sensor. Now on the intake box, I see a small hole at the bottom. Is something suppose to be connected there?

That looks like oil drain to the sump. There’ll be a plastic hose entering the sump close to the dip stick tube, look for that and trace the loose end to where it’ll plug into that hole in your airbox.

Regards

[M3powerzz]

Ok I see where it goes, the plastic tube is missing all together.

[M3powerzz]

So I'm sitting in the car , its been running for about 15 mins, temp still cool. I figure the next thing is to change the thermostat?