Today I went Jeepin with a club that I ocasionally go out with.
We just do easy slow stuff. One guy had a Jeep Grand Cherokee. This Jeep only has an electric engine cooling fan that is designed to come on to cool the engine @ 222F.
Once we got into the slow speed stuff he began to have overheating problems. Not really overheating but puking coolant out of the overflow bottle.
I determined that there were no obvious leaks but that there was no pressure in the cooling system. The upper hose was soft when it should have been hard with pressure.
Once it cooled enough we popped the radiator cap off and it was junk! The rubber was hard and cracked so there is no way that it could hold pressure.
So what was happening was that the coolant was boiling before the fan was set to come on.
I scrounged through my junk and I found a usable 7LB radiator cap. 7LBs is not much but it's 7lbs more than what we currantly had. Using a 7LB cap will raise the boiling point to 233F which is above the 222F temp that the fan will come on at.
Since it was cool out I knew that the thing wont get to 233F and this will let us continue on our run.
Another guy started trouble!. Telling me and everyone else that since the Jeep comes with an 18LB cap that it needs an 18LB cap and nothing else will work.
Remember that we are out in the desert and theres not a auto parts store for miles. Were doing what we can with what we have available.
Then this guy says that when summer comes the thing is going to overheat. This is probly true. I then tell him. "Summer! I'm just trying to get him out of the desert, he needs to buy the proper cap tomorrow".
The owner agreed that he will buy the proper cap tomorrow.
The Jeep ran the rest of the day w/o any issues. Yes I'm sure that at times it was very close to pushing coolant out but it got us through the day.
Guy was an absolute bonehead!
We just do easy slow stuff. One guy had a Jeep Grand Cherokee. This Jeep only has an electric engine cooling fan that is designed to come on to cool the engine @ 222F.
Once we got into the slow speed stuff he began to have overheating problems. Not really overheating but puking coolant out of the overflow bottle.
I determined that there were no obvious leaks but that there was no pressure in the cooling system. The upper hose was soft when it should have been hard with pressure.
Once it cooled enough we popped the radiator cap off and it was junk! The rubber was hard and cracked so there is no way that it could hold pressure.
So what was happening was that the coolant was boiling before the fan was set to come on.
I scrounged through my junk and I found a usable 7LB radiator cap. 7LBs is not much but it's 7lbs more than what we currantly had. Using a 7LB cap will raise the boiling point to 233F which is above the 222F temp that the fan will come on at.
Since it was cool out I knew that the thing wont get to 233F and this will let us continue on our run.
Another guy started trouble!. Telling me and everyone else that since the Jeep comes with an 18LB cap that it needs an 18LB cap and nothing else will work.
Remember that we are out in the desert and theres not a auto parts store for miles. Were doing what we can with what we have available.
Then this guy says that when summer comes the thing is going to overheat. This is probly true. I then tell him. "Summer! I'm just trying to get him out of the desert, he needs to buy the proper cap tomorrow".
The owner agreed that he will buy the proper cap tomorrow.
The Jeep ran the rest of the day w/o any issues. Yes I'm sure that at times it was very close to pushing coolant out but it got us through the day.
Guy was an absolute bonehead!