Overcooling, Underheating

[danboone5]

Alright my Jeep has been not warming up right in over 8 months. This problem started after it began overheating back in April. I changed the thermostat out and it began this stupid "I'm not going to warm up and run like crap." Since then I have replaced thermostat 4 times with different brands and I know to use a 195 degree or the Renix system will run rich. I've flushed it twice. Thermal fan is good. E-fan is good. Burped it properly. Top radiator hose is barely warm. The heater blows lukewarm air. It is starting to get cold for around here and I need some heat. Don't get me wrong, I'm glad its not overheating but it is still a problem. I want to fix in right, not put a piece of cardboard in it. Its not that cold, the truck should run correctly. If you have some idea please let me know. I have searched here, Naxja, and a few others. I even googled it with no avail. Thanks for any help.

[mvusse]

My first thought was that you must have used a "failsafe" piece of crap garbage thermostat (they will be stuck open to never close again if they ever hit 200-210 degrees). But then I read you tried four different thermostats of different brands. I'm stumped.

[signalb]

What type of mix are you running in your radiator? You could try bumping up the glycol (antifreeze) content so that it runs a little hotter.

[vaquaro]

Have a look at "Go Jeep"'s site from Australia , he has a mod (flow reducer ) to hold coolant in the block longer , it looks simple and it might work for you . :thumbsup: http://gojeep.willyshotrod.com/index.htm

[vaquaro]

Here's an easier link :D http://gojeep.willyshotrod.com/HowtoRadiatorRestrictor.htm

[Comanche County]

Is the heater control valve on the heater core lines stuck closed? Check the vacuum connection to it. Also, is the temp gauge working correctly?