Approximate repair cost?

Chilton's estimates 0.5-0.7 hours per plug, not including access time, so figure about 50 to 70 per plug to replace with about 75 access time, I'd say you're looking at about 125+ to replace one, plus an additional 50 per plug over that. If one is rusted out they'll probably want to replace them all. You'll also have to pay for new coolant, and it would make sense to replace thermostat since you're doing new coolant anyhow, so add that in as well.

The engine needs to be removed Kelly Blue book says your car is worth anywhere from $4,000 on condition. If you think your car is on the low end, Sell the car the repair should be about $2,000.00....