I am an original owner of a 1999 Jeep Wrangler manual 6 cylinder. It has about 65,000 miles on it. The heat is not working at all. The blower is working, but it is just blowing out cold air. The air conditioning has been working fine. I replaced the radiator a couple of years ago, but no major work has been done on it since (except regular maintenance). Nothing is leaking anywhere. Do I need a new heater core?
I had the exact same problem last year on my 2000 tj. Would just blow cool air, room temp at best with the heat on. Ended up needing the thermostat replaced. Pretty cheap part, and very easy to do yourself.
1998 TJ Moss [COLOR=darkgreen][B][SIZE=3]Green[/SIZE][/B][/COLOR] Sahara w/ numerous scratches & dents whose playground is on a tropical island that's 33 miles long and 4-12 miles wide, in year-round 82 degree weather.
I am having the same problem. Never any coolant smell or leaks on the passenger carpet.
So today I drained the radiator (I was embarrassed how little fluid was in there).....probably only about a gallon of more brown water than coolant.
I flushed it with the heater on full blast for about 15/20 minutes.....no heat. then drained it again then took out the thermostat (It almost seemed like it was dry and a rusty brown. After that I refilled the rad with 50/50 and ran it again....
Still no heat but no puddles or maple syrup smells though. I noticed while I was repackaging the old water and flushings that there was a lot of sediment in the bottom of the bucket.
Something is probably clogged any ideas where I can go from here.
BTW, how would I go about flushing the heater core with CLR?
A buddy had this problem last year..I told him to disconnect the heater hoses and take a water hose and simply flush the core. He got all kinds of crap out of it flushing it both directions. Heater works like a champ now...
Alright after a couple of youtubes and threads on this great site I have a mental picture of how to flush the heater core with the hose. I am still a little confused how to keep the CLR in the core while it works its magic? I would guess that I would disconnect the hose at the rad side and not the firewall....and send it tdown the tube and let sit a while.....
Another dumb question.....should I have the heater running while flushing....or does it matter?
Do NOT use CLR!!! Read the back of the bottle!!! It's not safe to use. It will eat up the aluminum in the heater core. You will do better using vinegar or the stuff made by Preston to do the cleaning. Then don’t use tap water when you refill. That causes the heater core to clog up.