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Loosing coolant

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grifter:
3.2 elite

Last couple of months I've been loosing coolant, got to top it up after say 50-100 miles back up to level, usally when light low coolant light comes on. After a run the other night had a good look underneath, left it sitting for a while on my drive, couldn't see any drips anywhere, had a good scour around engine bay with torch no sign of anything. Done block test last night and nothing showing, not that I suspected HG but just ruling it out.

Last year replaced rad, oil cooler, hose from block to heater radiator also replaced the top rad fan switch, still got the lower one to do, also replaced the aux water pump under the coolant bottle as it was leaking, that was last Year too. Also checked the floors for any water ingress, bone dry. Only thing I can think is maybe leak from oil cooler plate and it's running down the back of the box or something and I can't see it. Made sure I used the right sealant and that everything was clean and torqued up properly so be surprised if it's the oil cooler plate leaking, although if it was that then perhaps it is dripping out when the car is moving and then pooling somewhere in the V when stationary, then pouring back out when I'm moving so I don't actually see the leak.

Hopefully get in on the ramps at the weekend and get right under it. HBV is quite new so not suspecting that either.

YZ250:

--- Quote from: grifter on 07 March 2024, 06:43:14 ---........
HBV is quite new so not suspecting that either.

--- End quote ---

I wouldn't completely dismiss the HBV, as my original on my 3.2 lasted around 80K miles but it's replacement lasted less than 5K miles. The replacement was purchased from a main dealer and the box had the hologram on it. The second replacement was still OK when I sold it. Worth checking using the max high temp, max low temp method.  :y

TheBoy:
Carefully check the plastic parts of the main rad for leaks as well.  IME, you won't see a puddle under the car, and probably won't see much in way of steam either.  Its hairline cracks that close when the pressure drops.

I had a spare cap with a shrader valve in, and pumped up to about 8PSI, then used a torch to locate mine.

TheBoy:

--- Quote from: YZ250 on 07 March 2024, 09:35:23 ---
--- Quote from: grifter on 07 March 2024, 06:43:14 ---........
HBV is quite new so not suspecting that either.

--- End quote ---

I wouldn't completely dismiss the HBV, as my original on my 3.2 lasted around 80K miles but it's replacement lasted less than 5K miles. The replacement was purchased from a main dealer and the box had the hologram on it. The second replacement was still OK when I sold it. Worth checking using the max high temp, max low temp method.  :y

--- End quote ---
There did appear to be a duff batch a few years ago, a few people, myself included, got caught out :(

Migv6 le Frog Fan:
Heater matrix is also a possibility. I currently have similar symptoms due to a small leak at the matrix.
Which reminds me, I really must get off my arse and replace i soon.
Only use it occasionally, so havent been desperate to do the job.

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