1999 Cadillac Seville STS Repair and Maintenance
A guide to problems, costs, maintenance and repair for your 1999 Cadillac Seville STS
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1999 Cadillac Seville STS ProblemsCheck Engine Light Due to Gas Cap Issue
A Loose or worn gas cap may cause Check Engine Light to illuminate.
Overheating of the engine may cause the cylinder head to expand, severely straining the head bolts and damaging the threads in the engine block. This commonly results in a blown head gasket. Our technicians tell us the engine block threads must be repaired before the cylinder head is reinstalled.
The water pump and/or the plastic side tanks on the radiator may leak causing a loss of coolant. The engine may overheat due to coolant loss. Continued coolant loss after external leaks have been repaired could indicate a blown head gasket.
1999 Cadillac Seville STS QuestionsI plan to replace my Ignition coils and modules, how many will I need to buy? (1 answer)
how many ignition coils do I need to purchase?