My 97 Jeep Grand Cherokee Laredo 6cyl 4wd heater quit working.?
My  suv overheated and I fixed the hole in the radiator (stop leak)and did a  complete radiator flush and still working fine. However a few days  later my heater quit blowing hot air. It blows great just cool air. It  happend all of a sudden and temperature gauge wasn't affected when this  happend. What could be the problem? 
Jeep - 8 Answers
Random Answers, Critics, Comments, Opinions :
1 :
Heater core going out. When you smell antifreeze coming out the vents it's about completely shot.
2 :
its the radiator again or the heating core...you might have a slow leak somewhere........
3 :
I have a Chrysler mini-van. Same manu of jeeps, and I had that problem when my coolants run low. Just that first.
4 :
The  heater core is out when you flushed the radiator you may have stopped  up the heater core it is a radiator underneath the dash board,good luck.
5 :
for  some reason the hot water is not getting to your heater core. why did  the radiator overheat in the first place, Could maybe be your  thermostat, which could have caused your overheat. maybe the vaccuum  line to the heater core valve, maybe the core itself is now plugged by  the stop leak. if i could physicaly be there, I could maybe tell you!
6 :
You  have an air pocket in the cooling system, or the thermostat is stuck  open.  If you suspect an air pocket, which might not show up for a few  days,  loosen the heater hose clamp nearest the thermos at and partly  remove the hose.  Leave the engine off, and remove the radiator cap.   Observe the coolant level.  Fill if needed until coolant is present at  the hose.  You might have a heater control valve, if so manually hold it  open.  Once coolant is present re-install the hose and clamp, fill the  radiator until it is full.  Also fill the overflow reservoir untill it is aboce full-cold.  Re-check  the overflow every once in awhile to make sure it stays full.  This should correct the problem.  If you end up changing the thermostat  use the above procedure to bleed the system, or anytime you repair the  cooling system.
7 :
2 things, you have a air pocket in your  heater core or you have plugged the heater core with stop leak. hold  both heater hoses and see if there both hot, if there not then go from  there.
8 :
Christiano hit it the closest,what happened is  when you put in the stop leak it clogged the heater core,along with any  rust in the system. what you need to do is replace the radiator,stop  leak and fix a flat are 2 items that should have never been invented.  but any way when you replace the radiator unhook both heater hoses from  the water pump and thermostat housing. have one going to something  underneath the jeep to catch th coolant and crap that comes out. through  the other one run water from a hose.what i do is get the female hose  repair  end and screw it on then clamp the heater hose on the end that  slides in.after doing that for a minute switch heater hoses. repeat  until all the crap is out of the heater core.   then flush the entire cooling system just run a short hose from the  heater hose fitting on the thermostat to the one on the waterpump. after  that hook the heater hoses back up and have at it.
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