Well I did a radiator flush on my '96 4.0 XJ 70k miles. Here's what I did...
I used a Wynn's 100% fluid exchange machine (in through the radiator, out through the block), and flushed 10 gallons of water through the system. Then I dumped a bottle of Prestone's 7 hour flush and drove around for a couple of hours.
I flushed it again with 8 gallons water, and then replaced the upper and lower radiator hoses, the thermostat, thermostat housing, and the radiator cap itself. I also removed and cleaned out the recovery bottle. There was about an inch of green sludge on the bottom.
Then I filled the machine up with 5 gallons of Prestone's 50/50 mix antifreeze prediluted with distilled water, and ran that through the system. I still need to adjust my freeze protection a little bit, but so far everything seems to be OK.
After the first initial flush (running water and the cleaner), I immediately noticed the Jeep was running between 10 and 20 degrees cooler, depending on driving conditions.
Now that I have antifreeze back in there, it's still running between 10 and 20 degrees cooler. Almost a little too cool... sometimes the gauge will be just over the white mark between 100 and 210. However when it's left idling, after 5 to 10 minutes, the temp will slowly creep up to where the aux fan will kick on.
Now weren't there some bare bones Cherokees offered without an aux fan? Meaning the cooling system should be efficient enough to keep the temp in normal range without the aux fan's usage?
My fan clutch seems to be nice and tight. Fan stops spinning almost immediately.
I used a Wynn's 100% fluid exchange machine (in through the radiator, out through the block), and flushed 10 gallons of water through the system. Then I dumped a bottle of Prestone's 7 hour flush and drove around for a couple of hours.
I flushed it again with 8 gallons water, and then replaced the upper and lower radiator hoses, the thermostat, thermostat housing, and the radiator cap itself. I also removed and cleaned out the recovery bottle. There was about an inch of green sludge on the bottom.
Then I filled the machine up with 5 gallons of Prestone's 50/50 mix antifreeze prediluted with distilled water, and ran that through the system. I still need to adjust my freeze protection a little bit, but so far everything seems to be OK.
After the first initial flush (running water and the cleaner), I immediately noticed the Jeep was running between 10 and 20 degrees cooler, depending on driving conditions.
Now that I have antifreeze back in there, it's still running between 10 and 20 degrees cooler. Almost a little too cool... sometimes the gauge will be just over the white mark between 100 and 210. However when it's left idling, after 5 to 10 minutes, the temp will slowly creep up to where the aux fan will kick on.
Now weren't there some bare bones Cherokees offered without an aux fan? Meaning the cooling system should be efficient enough to keep the temp in normal range without the aux fan's usage?
My fan clutch seems to be nice and tight. Fan stops spinning almost immediately.