180 or 195 thermostat

Sounds like normal operation to me. try letting the fan come on by itself at 210. it should pull down under 200 and shut off. if temp dosent come down,then you have a concern. the ecm protects against high water temp. should derate around 230. IMO, your not making enough power to exceed the limits of a properly operating cooling system. I dont think you should be concerned.

 

kick in the fan at 200 ok cat r great engines but they r a head case so be on the safe side and it wont hurt ok 200turn it on , am in jamaica and we put in a pair of 175s just to be sure

 

Just spoke to a very knowledgeble Cat mechanic today about the same problem. If I run my truck at fast idle while in the sleeper, temp will climb to around 208, then eventually engine fan will kick on. Turning the engine fan on manual, or simply turning the A/C on will keep the temp around 182 on my gauge. Maybe my radiator needs to be "blown out". For peace of mind, I ran the fan on manual couple of months back in Chicago when they got about 3" of snow and freezing rain, because the water temp wanted to stay around 208.
The mechanic I spoke to said that the sensor tells the fan to come on around 210, (don't remember the exact #), and he was fairly sure that there was none available that would kick the fan on at a lower temp, like 200. He commented that he is often questioned about that, with our Louisiana summers being so hot.

joey83854
Just wondering, do you have any problems with your EGTs when your water temps rise while climbing a hill?

 

Your fan will come on a 217f coolant temperature ( 3406e c15). 207 on older and c12. You will find your international is hard to keep cool. I have one with 700 to the ground and its way harder to keep cool compared to a Pete. Just the size and design of the rad. I would keep turning on the fan at 200. I think Cat just wants to sell more head gaskets and heads with that high of fan turn on temperature. I have run the 180 t stat on higher hp builds, it gives you a bit more time before it heats up. Your stock reg is 192.

 

I wouldn't put a bigger non wastegate turbo on unless you are going to add more fuel,I put my bigger turbo on about 2 weeks before I put the big injectors in and the boost did rise by 5 psi and EGTs fell but a dog to drive under 15-1600rpm add a 3406B manifold to this and my guess is you would have to run it at 1800rpm all day to get anywhere.
IMO put on a coated manifold from PDI,full tilt,Pittsburgh would be a better option with your stock turbo and some ECM changes it should make good hp.

 

I have read many times that putting the 3406B manifold on a C15 that hasn't had a serious HP boost will lead to problems such as turbo lag, among other things. What I am wondering, is why doesn't a 3406B have the same problems? In most cases, a stock B model has less HP than an E, or a C15, so I would think that they would have more of a problem with the bigger manifold. Is a B model turbo just more efficient?

 

Out west in Aus a lot of guy put in lower temp thermostats because of the high ambient temps, interestingly if you do this but dont change the fan turn on temp you get a small gain in fuel economy because the fan is not on so much, comes on later on a pull.
If you want the fan to turn on earlier you fit a horton switch from a mechanical engine and simply run the fan solenoid wire through the switch and back to the solenoid. These switched come in a range of temps. Fit the switch to a unused hole in the thermostat housing. If you do this it will not take away the ECMs ability to control the fan, so it will still work with the A/C, jakes, PTO, etc. it will simply come on earlier when it gets hot.