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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > What pressure for radiator 328i



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      05-09-2024, 09:27 PM   #1
Grease23
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What pressure for radiator 328i

I changed the thermostat and the coolant and the upper radiator hose. Poured in new coolant. Then before I ran the bleeding procedure, I thought I'd pressure test the coolant system. Everything is great until I hit 6 psi, at which point the radiator end of the new coolant hose moves back slightly and coolant sprays and pours out. The clip is still in place.

Am I expecting too much of these goofy clip-on hose connections? I'm used to cars passing easily at 10 to 12 pounds. The upper hose is from fcp but I don't think it is BMW official product. I'm hoping somebody is going to tell me that these are special low pressure systems and 5 psi or so is fine, but I realize that would be too good to be true.

Thanks for your help.
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      05-10-2024, 09:17 AM   #2
Grease23
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Turns out the problem is the after-market hose. (Vaico brand?) It slides on, but just won't slide on the last 1/16th inch that the factory one does. Since the channel for the metal clip is quite narrow, this prevents the clip from engaging. I've tried pushing as hard as I can and it won't quite get there. I'm going to go get the factory hose from a dealer today.

What is a bit surprising in retrospect is that the cooling system will hold 5-6 psi with no clip engaged. It doesn't leak at all, then it suddenly pops off with a real gusher.
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