Originally Posted by gt77

So i took it into the shop and the mechanic replaced the thermostat. The heater worked for a while. Now it's still blowing cold air and the temp gauge is hovering at about 220-230. He said I had only about 30% compression on the 4th and 6th cylinders. Possible break in the head gasket or a bent valve. He doesn't do this kind of work and referee me to someone else. They quoted me a price of between 800-1000. Is this a fair price or should I look elsewhere? Thanks for all the advise so far it's been most helpful.