Join Date: Aug 2002
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Re: Over heating solutions?
I recently had an overheating problem in my CJ after installing a 30 in it. This is what I ended up with. 3 core radiator, flex fan, good sealing fan shroud, high flow water pump, 165* thermostat. I run about 165-170 when moving (yes it does run good that cool), it might get to about 195-200 if I am running it real hard on the trail. I am not a rock crawler so I have not tested it that situation. I would first get the fan shroud. This is will make the biggest difference in cooling. A high flow water pump will only help if the rest of your cooling system is doing its job. Running it without a thermostat is not a good idea. For the radiator to cool the water/anti-freeze properly the coolant must stay in the radiator for a certain amount of time but not too long. No thermostat and the water will be going through the radiator too fast to cool it down. This has been hotly debated for many decades. I have personally found that this holds true. You live in a very cold climate, if I am not mistaken. Running no thermostat would cause very long warm ups and also makes running mostly water not a great idea. If the temperature does not get down to freezing you would ok in doing this. Also keep in mind that the more water you add the more chance of corrosion, however water is a better heat transfer agent. You have a give and take. If you go with a high flow water pump make sure you replace both upper and lower radiator hoses with the new ones with the inner spring core. The high flow water pump will cause the hoses to collapse if they do not have the spring inside. After I put a Flow Kooler water pump on my 360 I was still running hot. I replaced the hoses with the ones with springs and them and it reduced the operating temp, not by much but enough to make a difference. My flex fan pulls more than enough air to keep my rig cool. I was told by a reputable radiator shop that if the fan at idle will hold a rag to the grill solidly than the fan is pulling enough air.
1. Put on a good sealing fan shroud. Not just a ring around the fan in the middle of the radiator. The shroud must enclose entire core of the radiator and then circle around the fan blades.
2. Try a lower temp thermostat
3. High flow water pump and new radiator hoses
4. Replace flex fan with clutch fan &#8211; keep in mind that the different fans are likely to have different distances between the radiator and the fan blades when making your fan shroud.
Good luck and hope this helps out some.
[img]images/graemlins/givemebeer.gif[/img] and i can come up with all sorts of solutions, they just may not be the best! [img]images/graemlins/grin.gif[/img]