Ok, so I had a bit of a brain fart and forgot to check my antifreeze before this record cold snap. Was -10 on Saturday night and we decided to take the jeep on Sunday. Made it less than a mile and realized i wasnt getting any heat in the motor or out of the heater. I turned around and got home then the temp gauge was pegged when i shut it off. I let it cool, put some antifreeze in and turned on the heater and could get some heat and the motor had heat also. There were no leaks, didnt blow any freeze plugs, and the oil had no signs of water, vice versa. This morning was frigid also and i couldnt get more than 120 out of the motor and the heater would only blow ice cold air. So my first thought is thermostat is stuck open. Ok no biggy. I changed it, motor runs at normal temp now but i only get luke warm air from the heater. Thoughts???
Likely even though your gauge shows normal temps the engine still isn't getting as hot as normal. Even with the correct 195 thermostat mine fluctuates between 187 and 197 (per scangauge) on these cold days where it's below zero. Won't get above 200. I've been meaning to put some cardboard on the radiator so it will get hotter. I've noticed the difference in heat output when the engine is at 187 and 197 is pretty big. If it would run at the usual 210 I think it would be fine.
If you have the original heater core and have never flushed it that's probably not helping either.
CU Boulder Aerospace Engineering
Have you tried blowing all the gunk out of your heater core? Busy out the garden hose and give it a blast. Takes 5 mins. Just disconnect the two hoses from your core and run the warmer through for a minute, until it comes out smooth and free of junk. Made my jeep go from Luke warm to hot as Hell!
Id do a full system flush with the old radiator then put new one in that way you don't plug your new radiator up. Prestone makes a Flush/Fill kit you splice into heater line and it flushes entire system... Good luck!
__________________ The Wolf is not concerned with the opinion of sheep.