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Coolant pressure testing and vacuum filling


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Has anyone used those coolant pressure testing kits that have a hand pump? Any tips? What pressure should I pressurize to? I have a leak somewhere I see some coolant stain at the bottom of the engine plastic tray but cant see where from. So thinking to pressurize it when it's cold and have a look. Any tips on how to look and spot the leak in the busy engine bay? It's quite hard to see anything.

Has anyone used vacuum refilling procedure to refill coolant? Seems to be a common method for European cars where you drain the coolant and create a vacuum in the system which basically sucks all the air out shrinking the hoses and then you let coolant get siphoned back in. Looks like a interesting method to avoid air locks. Question is how safe is it to allow those hoses that are really really old to suck and contract like that? My pressure testing kit has the hand pump and all the radiator caps and a thermometer but isn't designed to be a vacuum filling system as I don't have the extra bits to create a vacuum. Rather than ordering a completely new kit for vacuum, is therea way I can use my pressure tester to vacuum fill?
 

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Not sure on the operation of any ‘Pressure Testing’ kits but I do know that a known area of weakness for coolant loss on an IS is from a failed ( not catastrophically) water pump, the coolant tends to weep at first from the shaft/seal area and a tell-tell is Pink staining from the coolant under the shaft area!

 

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