Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Hello. Have you first checked your coolant level to make sure that you aren't a little low? you could be low enough to not allow adequate coolant flow through your heater core, but not so low that your engine overheats. Check the coolant level first. If your coolant level is good, check to see if the two hoses going into the firewall are both hot. They are about an inch in diameter and go to your heater core. If they are not hot, or only one is hot while the other is warm or even cool, then you have a plugged heater core that will need to be back flushed. Please check those two things to start with and let me know what you find.