in the resivoir:
- bubbles
- vanishing coolant
- oil mixed in with the coolant
In the radiator
- missing coolant
- When cap is removed and car is run, bubbles form constantly.
in the oil:
- Milky texture (oil will look like coffee with cream)
- White/mocha residue on rad cap
in addition:
- white smoke on startup
- power loss
Since youve overheated before, tread very carefully. If it happens too often, or if you dont catch it in time, you can blow the HG or warp the head. Start with the cheapest to fix, and work your way up
Rad Cap--->Thermostat--->Radiator Hoses--->Radiator (see if it holds pressure)--->Water Pump--> Headgasket.
i went through a LOT of troubleshooting with my old SC300, so this is an area that i have experience in. Not by choice
