How to tell if radiator cap is bad?

wifiabc, Mar 27, 8:52pm
Is there a way to tell if a radiator cap needs to be replaced!

intrade, Mar 27, 8:58pm
yea when you buy a new one for 8 to 18$ and you dont lose no water after. thats how you know the old one was bad. make sure its the right pressure one for the vehicle 80% of problems on cooling systems are from faulty caps.

fiatracer, Mar 27, 10:34pm
I'd suggest - if you suspect it might be, then just replace it and rule it out.

wifiabc, Mar 28, 1:40am
OK. I'll replace it and see if the problem of coolant gushing out of the expansion reservoir goes away.

xs1100, Mar 28, 6:21am
or if youdont want to spend the money take it to a mechanic and they ll pressure test it for you and charge you accordingly