wssix99

iTrader: (5)

I'd do a pressure test. You have nothing to loose (shops will do them for free) and can only gain knowledge and/or piece of mind.

01SuperSport

iTrader: (7)

Water pump? My car overheated once and I had the water pump changed along with the thermostat. Never happened again

01SuperSport

iTrader: (7)

If it's leaking water the radiator is bad. Happened to me as well

nimrod.sixty9

iTrader: (5)

Not a chance a shop around here would do it for free. What preassure test are you talking about?

It isnt leaking water now. It was a plug that was leaking.

I did however hears the water pump, before I noticed it was overheating.

wssix99

iTrader: (5)

Any large muffler/auto repair chain should do them for free. The tester hooks to your radiator where the pressure cap goes and they pump in air with a device that looks like a bicycle pump. They then see if the thing holds the pressure and/or where leaks start to spring up.

JustinEntropyRad

Some of the larger chains will offer free pressure check as a leader item. Check at O'Reilly or Advance to see if they have one on the loaner tool program.

The vacuum plug to cover the LT1 bypass port isn't designed for hot coolant, and is likely why it is failing. Get a high temp cap made for heater hose return ports from a radiator shop/parts house, or use a 1/2" brass dowel pin and Devcon two-part epoxy.