Any other ideas? Anyone know if the coolant level sensing system Buick uses is prone to problems? Also, the oily mess that has collected in the coolant system baffles me. Or I think perhaps I should replace the coolant level sensor. What gives? My main concern is that I may have a head gasket leak causing oil to get into the coolant, or worse, something cracked.
To eliminate the possibllity of low coolant, I plan on really overfilling the system and seeing if the light is still intermittent. The "Low Coolant" keeps coming on erratically even after I did this. I removed the low coolant sensor from the radiator and cleaned a slight amount of goo from the sensing prong and re-installed it. Also, if I remove the radiator cap, coolant pours out because the radiator is completely full. In addition, the "Low Coolant" indicator light recently started illuminating intermittently and the coolant level appears it is is well above the "Min" mark on the plastic coolant reservoir and it appears there are no leaks. Now I notice that the radiator filler neck keeps collecting this copious oily mess that looks like thick engine oil, but the oil level is not dropping one bit, nor is there any coolant in the engine oil. I flushed and replaced the coolant with the specified orange Dexcool last year. I figured the rental car company put some type of additive in the coolant that was not compatible with GM coolant.
Before I met her she bought the car from a rental car company with 13,000 miles on it and she never had the cooling system serviced. Last year I noticed my wife's 2001 Buick Century had a gooey sludge in the coolant. I figure with all the wisdom on this list, I'll ask a non-VW question.
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