Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Hello, my name is Bobby. Thank you for the question. If it ha a blown head gasket then that will cause the temperature to fluctuate and can cause air to enter the heater core and keep the heater from working. If it is a head gasket it is always cheaper to replace the gaskets instead of the entire engine. You are typically looking at about a $1000-2000 difference. I hope this helps. If you need more help please let me know.
that is what it sounds like to me as it is common in this engine. I typically perform a block test first to verify this. Any shop can do this test.
That and the Bars Leak with carbon fiber are decent quick fixes but they are not long term.
Let me know if I can be of further assistance. Have a great rest of your day. Please rate my service when you have time also. Thank you.