About a year ago, I posted a thread regarding my Jeep running too cold (~160F) and I tinkered around a lot trying to solve the problem, changing out thermostats and what not. My heat was also luke warm at best.
Long story short, my temperature sending unit AS WELL AS the wire harnesses leading to the sending unit were all screwed up and was giving a low reading (~150-160 degrees F). I changed the sending unit and the wiring harness and that caused the gauge to read about 190 F (with small fluctuations). I also replaced the Stant Superstant 195F I had in there with a Mr. Gasket 195 High performance thermostat and now it is running nearly 210-220F (verified with an infrared thermometer at the thermostat housing) and also reads 210 on the gauge. For those of you who are wondering why I changed it out.......the superstant was only running about 190F and now that winter is coming, I need all the heat I can get, and now that my water temp is 210-220F, it helps my heat a little bit. Oh and the Mr. Gasket does NOT cause overheating (at least up to now it hasn't).
Anyways, the reason for this post is that, despite my operating temperature being correct at 210F, my heat is still only luke warm at best (especially in these winter months with air temperatures of only 10-20F). My heater core is completely flushed (I did a CLR flush) and the water temperature is nearly the same on both the inlet and the outlet hose (10 degrees F difference.) I am suspecting my blend doors are not doing their job, however I have heard this is more of a problem on WJs than ZJs.
On a cold day, perhaps 15 F, it takes my jeep a good 10 minutes to reach operating temperature and another 5-10 minutes to get "warm" air blowing through the vents. My question is, does anybody else have this problem, of having luke warm air blowing through the vents at operating temperature? And if you do, does anybody have a solution to the problem as well as some further insight? ANY help would be greatly appreciated.
For those who I drove crazy with my earlier posts (about running cold), I greatly apologize.
Thanks for reading