9/11/2023 0 Comments Bad coolant cap symptoms![]() ![]() A coolant recovery reservoir is required because automotive cooling systems go through cycles of expelling and absorbing coolant through their normal operation. It is usually located in the engine bay near the radiator. So you've been running a 200 kpa cap for at least 3 years now it seems without issue? No issues or other leaks since? I can't find any mentions online of anybody running a 200 kpa cap on the X5, just some other older BMW sedans when guys track the cars etc.The coolant recovery reservoir is the storage and supply reservoir for engine coolant. Given that the car has gone this whole time without issue on the factory 140 kpa/20 psi cap, doing a 200 kpa/29 psi cap feels a little band-aid-ish but then again if passes the chemical block test at this point I'm not real sure what else I could try. I did order a 200 kpa one from Amazon to have on hand this weekend - looks like the same one you ended up linking. If it passes the chemical test then I'll do the coolant cap. Again, my next thing I'm going to do is a combustion leak detector (chemical block test) - if that fails then the cap is moot because I've got a bad head gasket, cracked head, or block. Again, I have dye in the system now anyway and the only place I can find any trace of coolant is spit out from the top, presumably due to the pressure raising higher than the cap is rated for.Īhh okay that makes sense. The new tank and cap are both from FCP Euro, and assumed fairly high quality so I doubt the new tank is leaking. What hose do you mean exactly as far as the "top left corner"? Is that the thinner hose running from the radiator to the coolant tank? Maybe your coolant hose on the top left corner is the real culprit? Like I said if your coolant tank was from a local auto parts store - it probably leaks at the top and bottom. I did find a 200 KPA for the e60 m5 however.Īlso not expensive worth a shot. I thought I replaced it since - but the one on the car still says 200 KPA.Īmazon has a 200 kpa for like $12 - give it a shot.Ģ00 KPA Radiator Coolant Expansion Overflow Tank Cap Cover Compatible with BMW E90 E60 F10 F7639021 (200bar) įCP euro only shows me 140 KPA caps for my 35i. ![]() I drove home with it pieced back together and threw on the cap from the toolbox. One fine morning I found myself low on coolant away from the house a few miles - I went to put coolant I had in the trunk into the reservoir and i dropped it - snapping the inner ring off the outer portion. It didn’t work at the time but I never threw it out or returned it. Interesting- honestly I had an extra cap in my tool box from years prior when I purchased one online for my old E46 or maybe my E60. To clarify, your X5 is the straight 6 turbo 3 liter correct? If so, why does yours have a 29 psi cap? As far as I can tell, the standard one of 140 kpa/20 psi? However, I notice your cap shows to be 200 kpa (which is 29 psi). Unfortunately the original cap got tossed so I can't just stick it back on but I'm nearly certain it too showed 140 kpa. So, pretty clearly the cap is spitting a bunch of coolant out because it's obviously routinely getting above ~20 psi. Watching it with the coolant pressure tester it readily gets above 20 psi on the gauge warmed up at idle, and the cap I bought from FCP Euro lists 140 kpa on it which translates to about 20 psi. so I don't THINK the head gasket is bad but next weekend I will be doing a chemical test on it too. Not getting any increased pressure when revving the engine, even in gear under load either. ![]() Can't find any trace of coolant in the oil and it's gone through easily 5-6 gallons in the past month. I've bled it a bunch of times, and this past weekend went to town on it with a coolant pressure tester and can't find any trace of a leak. I've put dye in the coolant and can't ever find any trace of anything ANYWHERE except a bit on top of the coolant tank. Since then, it still intermittently eats coolant. The tank itself was definitely originally leaking and I'd find puddles below it. The tank was leaking originally and I just went ahead and got a new cap with it. I've actually already replaced the coolant reservoir AND cap both new from FCP Euro. Good news the electric water pump bleed is easy as pie and coolant is readily available in stores and online. If the cap doesn’t work for you - the reservoir is easy to do but you will pretty much evacuate the entire coolant system. Definitely but Mahle or equivalent from FCP EURO or others. On a further note - don’t buy the reservoir from autozone - it will leak with the quick lock coolant connectors. Since then I’ve replaced the reservoir during OFHG as a preventative maintenance. ![]()
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