Coolant from the muffler is not good. Now I am confident it is a head gasket. It is a major job on any vehicle. As far as gaskets, you will be removing more than just the head gasket so when you get the gaskets, usually they come as a kit. As far as cost, I don't know where you live or the average labor cost per hour, so that makes it hard to estimate. In my area, PA, I would estimate that the cost would be around 4 to 500.00 to do the job. According to my manual, it calls for 6 hours labor to remove and replace the head gasket. So, take that times the labor cost to let you know how much you will have in labor alone. Then get a price on the parts cost.
If you need any help, let me know. I will do my best. Also, as a consumer of used vehicles, I thank you for trying to repair it before you sell it. At least you will be able to sleep at night. Plus, you will feel comfortable asking more for it since it will be repaired.
Sunday, December 22nd, 2013 AT 8:08 PM