Jbarber619

So last week there was a hissing sound from my radiator cap, i changed that, and now there's coolant coming out of the cap. It doesnt over heat so im thinking its a bad water pump or maybe my thermostat is staying closed. I just hit 130k on my LS430 so it due for a tune up. Im just asking for some advice
Thanks

jimbosr1

is your coolant overflow tank overflowing or bubbling?
if your water pump or tstat is not opening you would overheat.
if your overflow tank is filling up and overflowing and or bubbling it will be a headgasket going bad.

jimbosr1

one thing to check would be you may have a crack where the rad cap connects too, maybe around the lip of the coolant tube.

Jbarber619

Nothing was boiling over and nothing was coming out of the over flow tank. The cap shouldnt be bad cuz i just bought it. Maybe i installed it wrong, i did it in a rush. ill have to look at it again and see if there is any cracks because its was only flowing from the cap

Jbarber619

maybe i need to just let the car run for about 15-20 mins and see if anything else happens. becuase it just started having the problem a week ago. Just trying to catch it before anything worse happens

jimbosr1

i would take it out for a spirited drive for 20 minutes and then look at the overflow tank and the rest of the coolant system for any leaks .running at idle will not show anything.

Jbarber619

Alright, ill definitely take it out after work

Thanks for the input