Postby DIESELTRINI » November 9th, 2009, 9:59 pm
Start the car from cold, as in cold from sitting overnight. Well.. before you start the car, check the coolant level in the radiator, top up if necessary and put the cap back on.
Start the car, and hold the RPMs at about 2000 for about 2 mins. Now go and remove the radiator cap again. If there is any pressure in the radiator, you have combustion gases leaking into you cooling system somewhere... usually through a blown headgasket.
The oily residue in the coolant is the giveaway. Sounds like the previous head job was not successful.