I have a heater problem. When I bought the jeep the Ac works great. But the heater didnt heat up at all. So I flushed the whole system out . Heater core had some nasty brown black gunk in it flushed the core out for like 45 mins. Well it blows alittle bet of heat, when its freezing out it dose no good unless I run the jeep really far then you can kinda tell it alittle warm in the jeep. And some times. My lights dim and volts drop for a slit then it picks back up with a clicking notice like when ur Ac is running . Any ideas? Idk if the heater code is bad cuz I hear the only way a core gose out is when it leaks. Help? Lol thanks

 

have you replaced you thermostat? this and a core flush worked great for me. also make sure you get all the air out of your system, that is very important.