NGC-Using smoke tester for auto coolant leak

[brider]

Has anyone used a smoke tester/machine to check for automotive coolant leaks? Something like this:

https://www.amazon.com/Automotive-Compressor-Professional-Detector-Diagnostic/dp/B0D3BMJGXY/ref=pd_lpo_d_sccl_2/136-5596085-6278661?pd_rd_w=7x9ML&content-id=amzn1.sym.4c8c52db-06f8-4e42-8e56-912796f2ea6c&pf_rd_p=4c8c52db-06f8-4e42-8e56-912796f2ea6c&pf_rd_r=SWPG4MDED8M9KPRGQ0G1&pd_rd_wg=R6LQx&pd_rd_r=40e35f58-331a-438e-92eb-fb1709068cbc&pd_rd_i=B0D3BMJGXY&th=1

I have a Range Rover that I replaced all the upper coolant hoses on but in attempting to vacuum-fill the system, it won't hold a vacuum. Can't figure out where the leak is, can't "hear" it, so this smoke thingy seems like an obvious way to reveal it. Some units operate at higher than 15 psi and I'm wondering if that's above the auto operating psi (my wife's Jeep has a 14 psi coolant tank cap, for example) if it would be a problem.

[n3303j]

Systems are usually meant to hold pressure. Are you sure that you aren't accidentally opening some kind of vacuum relief valve? The radiator cap opens in vacuum to suck the coolant back from the reservoir to the cooling system as the coolant contracts.

[RinkRat II]

   For about the same money you can get a pressure tester to find the leak. Smoke is a good alternative for all the emissions hoses and fittings.  Flip of the coin.   With the smoke you won't use but a couple of PSI, not the full 15   My $.02
     Paul B 

[brider]

The vacuum method is an established procedure for my model as testified on my RR forum, so I haven't delved deeper than that into any relief features. My son used it on his '14 Audi S7, identified a loose hose clamp, then held vacum @ -1 bar (-14 psi). The only pressure-test I can think of that would be of any use would include smoke, otherwise I'm still guessing.