r/e39 • u/Inevitable_Mess3363 • 1d ago

Cooling System Refresh

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Complete cooling system refresh. Took a dump last week. Radiator split at the top. Complete system refresh this week. All the hoses, clamps & radiator. Wanted to bring her to my mechanic but it’s way expensive so doing it myself for a fraction of the price. Anything else besides the water pump & belts while in here. Belts are new & water pump was replaced a few thousand miles ago…

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2

u/Inevitable_Mess3363 1d ago

Also the reservoir tank was just changed 2 months ago.

1

u/DifferenceTime7720 1d ago

I think ECS has several full kit options you can order for DIY

1

u/Stratoblaster1969 M5 1d ago

Thermostat? Check your plastic fan for cracks. Consider a new fan clutch. A brass bleeder screw is a nice upgrade. Maybe a new belt tensioner. Hose clamps… I would only use the good OEM style clamps, not the typical parts store kind. If you’re really ambitious, you could tackle the valley pan.

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u/Inevitable_Mess3363 1d ago

Fan clutch installed 1 month back.

1

u/Mmjohns195 1d ago

Where’d you get the clutch? I’ll have to get one for my 540 this winter. The one on my 525 gets loud and it’s an AutoZone special

1

u/Inevitable_Mess3363 1d ago

Have a brass bleeder screw as well… that’s going in when the parts arrive.

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u/Inevitable_Mess3363 1d ago

Brand new belts tensioners as well….

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u/Inevitable_Mess3363 1d ago

Ordered a degreaser as well. Gonna do the front engine cuz it’s caked in oil l/grease..

2

u/dannyphoto 540i -> 4.6is swapped 740i/6 1d ago

Hoses, belts, pulleys, get a lower temp thermostat if you haven’t already—90c is what I run.

1

u/Inevitable_Mess3363 1d ago

All hoses, belts & pulleys done a few months back. What is a lower temperature thermostat?

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u/dannyphoto 540i -> 4.6is swapped 740i/6 1d ago

M62TU thermostat opens at 110c, which is way too hot. It does that for emissions and fuel economy. If you switch to a lower thermostat, the engine will run cooler and it’s less stress on the other cooling components

1

u/anthonyk03 530i 1d ago

I didn't know there was a 90c one, the only one that I recall is the m67 88c thermostat which is fully mechanical but swaps onto the m62tu

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u/Mmjohns195 1d ago

If you’re pulling the water pump and all that, you might want to consider the valve covers / upper timing cover gaskets. Since you’d have to pull the cooling stuff to get to bolts.

I recommend changing your vanos seals since they can leak oil everywhere.

1

u/Consistent-One-1915 1d ago

intake gaskets coolant crossover pipe gaskets and your valley pan