1998 Pontiac Grand Am Q&A
1998 Pontiac Grand Am Question: Will a coolant flush cause for you engine light to come on and sometime cut off?
I have 98 grand am 179K, i recent went to get an oil change the tech suggested i need a coolant flush because mines was muddy. During the flush the muddy water clogged up the thermastat and that had to be replaced. When i left the shop my engine light came on now it runs rough and sometimes shut off. What did they do to my car?!!! It was fine before then!!! - carmomma
If your coolant was muddy looking that means there was oil mixed in with the antifreeze. Most likely a gasket had ruptured and it is probably the head gasket. When they did the coolant flush they put the system under extreme vacuum and probably made the problem worse. At that mileage a coolant flush where they hook a machine up to the car should never be done. Only a drain and refill. If a faulty head gasket was the reason for the oil in the coolant and they did a flush I can guarantee the head gasket issue was made worse which will put oil and coolant directly into the cylinder where the failure happens on the head gasket. - Autoson2930