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Originally Posted by Jetdoc
When I put the wrong type of antifreeze(Dexcool) in mine it developed a brown sludge in the cooling system. I don't know if it's the same as that.
Just for info, your cap, radiator and coolant can look normal and still have a BHG. If it does look like yours did it's a real bad sign.
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That brown sludge was probably from the exhaust gases mixing in with the coolant, same as my car. I have done headgasket jobs on newer GM 3300 motors which use dexcool from the factory. Dexcool forms CLEAR sludge, with round balls in it almost like hair gel. I think its from from the silicone content in it, the buildup seems similiar to he silica gel packets you get in a new box of sneakers.
I have been shopping for a new legend for about a month now. I went to look at one last week and first thing I saw was a mildly swollen reservoir hose that smelled foul. Took the car for a ride on the highway, when I got off, sure enough, the temp started to creep up. Nonetheless, the seller felt really stupid.
P.S. Were you running your car with the thermostat removed or stuck open?