Q&A

 Technician

There are many factors that will cause no heat. After the replacement of the thermostat you want to be sure that the cooling system was purged of air. Air will find it's way to the highest point in a cooling system which in most cases is the heater core. When this happens you will lose heat at idle and in many cases the vehicle will over heat. A way to verify that this is the issue would be to bring the idle up to about 2,000 rpm's when the vehicle is in Park with the emergency brake on. If you get good heat coming out of the vents when you do this then you have air in the system. At this point you will want to double check for leaks. If no leaks then properly purge and top off the system. - If heat does NOT increase,. It is possibly that there is a blockage elsewhere in the system, water pump is not pumping properly, the thermostat could be incorrect, or installed incorrectly. Either way, you will want to bring it into a shop if this is the case. Any time there is no heat there is potential for further serious damage. Best of luck!

had same problem. flushed heater , blew out so that core was empty. mixed washing soda with 1 gallon boiled water. added to core til full, let sit for 20 minutes, blew out again. repeat til gallon was gone. filled core prior to reconnecting heater hoses. worked great.