The Oil Can

Provider changed oil in the car belonging to my 86 year old mother. A few days later a "check cooling system" warning light came on in the car. She brought the car back to the provider & told him what was wrong. He added Prestone Radiator Flush to the system (without draining it) and said she'd have to return in a couple of days so he could do a complete cooling system flush at a cost of $75. I became suspicious and asked a qualified mechanic about the incident. He says their are ways you can "trick" the cooling system warning light to come on, plus you should not add the radiator flush to a system that's already full of of antifreeze. My mother had to pay another mechanic to drain & refill her system so that the Radiator Flush wouId not react with the antifreeze at her expense. I feel this was a scam to steal the extra $75 from an elderly widow.