Don't wanna blow coolant system! 23 psi for Pressure Leak Test?

[windnsalsa]

I don't want to blow the coolant system! Is much higher 23 psi rating true? [1998 Nissan Quest or Mercury Villager]

Please help! My pressure leak testing is delayed only because I found differing PSI numbers for the radiator SYSTEM. I will be using the Powerbuilt tester loaned from Autozone. I found the following numbers from various sources below:

...Leakage Test Pressure 157 kPa (23 psi), Cap Relief Pressure 81-109 kPa (11.8-15.8 psi) from sources:
+Villager [Chilton online via public library]
+Quest: [Chilton online via public library: can't seem to find spec]
+Quest: [FSM [factory service manual]


...16 psi???
+Haynes book for Quest/Villager, which didn't see mention of 23 psi:
page/section 3-1 "radiator pressure CAP rating" = 11.8-15.8 psi
page/section 1-2 "radiator CAP pressure rating" = 16 psi


Printed psi on cap itself:
+current on van: no spec. I don't know if OEM or 3rd party
+Oreilly, Autozone: 13 psi
+dealer: cap no longer available and no spec

[VStar650CL]

The 23 psi test pressure is correct, Pp LC-18 of the SM. Cap relief pressure is 15.8.

[windnsalsa]

The 23 psi test pressure is correct, Pp LC-18 of the SM. Cap relief pressure is 15.8.

Per my original post, the 23 psi is found in the FSM. Then, there's the other numbers from Haynes. And others in various forums where I've asked for feedback have mentioned 23 is quite high. Do you have any experience with this psi number?

[VStar650CL]

I have no reason to think the ESM is lying, that's straight from Nissan. Who knows where the info in Haynes came from, could even be a typo. Test pressures are for just that, testing. They're often substantially higher than the vent pressure of the cap.

[VStar650CL]

PS - The '98 Maxima ESM calls for the same test pressure, and there are no amendments to either manual. So the chance of a typo by Nissan is essentially zero.