35d worsening gas mileage - solved- thermostat/fan/EGR cooler - DIY with pics

[ZetaTre]

Originally Posted by scorpioy

When you connecting the hoses back to the themostat and EGR, did you apply some silicone gasket or something to prevent anything leaking? Or just use those existing clamps would be enough? I'm a bit worried about that.

Thanks

I did because I have a habit of lubricating everything, but the connectors have a o-ring inside and they are generally not prone to leaks. Ensure the hose is properly seated and the metal clip is secured and you should be fine.

This is the lube I use on rubber seals and grommets: NAPA AUTO PARTS

One thing about the cooling system: part #1 in this diagram



Is a rigid plastic tubing. You can flex it enough to connect it to the thermostat but it's a pretty scary thing. Consider releasing the bolt #2 holding it in place for simplicity. I believe I was able to reach to it under the EGR valve.

[scorpioy]

Originally Posted by ZetaTre

I did because I have a habit of lubricating everything, but the connectors have a o-ring inside and they are generally not prone to leaks. Ensure the hose is properly seated and the metal clip is secured and you should be fine.

This is the lube I use on rubber seals and grommets: NAPA AUTO PARTS

One thing about the cooling system: part #1 in this diagram



Is a rigid plastic tubing. You can flex it enough to connect it to the thermostat but it's a pretty scary thing. Consider releasing the bolt #2 holding it in place for simplicity. I believe I was able to reach to it under the EGR valve.

This might be a good document to list the steps to remove the themostat

BMW Workshop Manuals > X Series E70 X5 3.0d (M57T2) OFFRD > 2 Repair Instructions > 11 Engine (M57T2) > 53 Thermostat And Connections > 1 RA Removing And Installing _ Replacing Coolant Thermostat (M57T2)

which means we don't have to deal with the hose to the right side of it.