So, the Jeep's fan has been running more than I think it should. My wife took a little run over to a nearby town about 20 minutes away, and turned on the air. The temp gauge started climbing fast, so she turned off the air and turned on the heater and it came back down quickly. Electric fan works (replaced not too long ago) and is variable speed, and the thermostat got replaced as well. I'm starting to think the pump might be on it's way south. Any thoughts? Called the local mech., and he's going out of town for the weekend, so we'll just drive carefully for a few days.
You. Could try flushing the radiator from the inside out sometimes they get clogged with small bugs and such ,good luck
How old is the pump any leakage out of the hole? Does the heater blow out hot good hot heat? Is the belt old or new, does it have proper tension?
Don't see any leaks nor am I losing any coolant. Heater is still very effective, and hot. Just recently put on a new belt, and the tensioner shows it's still in good range, but closer to bad than good. I was actually thinking when I changed the belt that I might need to also change the tensioner.
I hope the heck this is not it, but did you check the oil for water? Do you have those plastic splash shields under the front end? If this is something that happened all of a sudden, very well could be the pump
My Jeep was fine, no overheating, but when the pump went it went quick so bad it started wobbling hitting on the shroud
Thermostat was recently replaced. Oil isn't milky, although I haven't checked in a couple days. Replaced the Electric fan. I've seen vids of these pumps that were corroded inside, and I think this is the original.
Seems odd that no overheating problem until you turn on the air, air conditioner pump causing the problem. I don't remember for sure but I had the same problem with a car, if I remember right it was the tensioner
bad bearing on the ac pump. I think my v-10 did the same thing. I replaced the belt, tensioner and idler. all were bad. Belt still wouldn't stop squeaking
Mine has the electric only, although I'm considering adding a clutch fan (fairly simple). Some of these came with both an electric and clutch fan if they had the towing package. Some had a hydraulic fan setup.
It is quite possible the radiator cooling fans are not coming on; driving down the highway can push enough air through the radiator to keep the temp down but adding the load of the AC compressor puts enough of a strain on the cooling system that highway air flow is not enough. I am not familiar with Jeeps. Many vehicles today have temperature sensors for the computer to control fuel and air mixture depending on the temperature of the engine as well as for controlling the fans; this is all through the control computer. There may be an inline resister to the fans that has opened. I would watch the temperature gauges while highway driving and then stopping at traffic lights to see if the temp climbs any while sitting.
