Engine temps

[H3HummerLineX]

Okay so I know this is been talked about a billion times however I'm concerned about my engine temps.

At 90° outside 75 mph going uphill with the air conditioner on, highest temperature on scan gauge was 227°. My normal temperature at 90 to 95° out is 205 to 210. Is this something that I need to be concerned with and what is the actual overheat temperature on the I5. What is the (DangerZone)

It has a new radiator, clutch fan and T-stat.
Would an electric pusher fan along with clutch fan help bring temp down, hood venting or trans cooler???




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[06 H3]

That's getting warm but I am not sure what max temp. I have a pusher fan and it helped. Are you sure your coolant is 50/50 mix.

 

[rsc]

Those temperatures are 100% normal and better than some have as "normal". My wife's 07 H3 runs those temps, my 07 H3 runs 215-225 at 70-75 mph. I think that if your cooling is in good order but you have high temps like mine, look at the oil cooler and transmission. After I get mine back from the trans. rebuild I will have a good comparison to make. I think the trans temps are overloading the radiator so if separating it from the radiator and running a 24k gvw cooler with electric fan drops my temps then I know what is doing it.

I tried hood vents (helped a little), a new relocated thermostat (helped a little) and new fan (new oem really helps, electric fans need lots of cfm's so I'm still playing around with that one). Overall, none of what I've tried lowered temps back to the 205-210 range but I did notice that 35's raised the temps a little on the hwy and hills at speed so that's why I'm leaning to trans heat being the culprit.

 

[poncho1965]

I've seen 220 this last week, ambient temp from 106 to 113. This is just. driving in town. I have an external trans cooler.

 

[H3HummerLineX]

Ok so I'm looking kinda normal I think. And I am on 35's x12 wide. Also have a rack with light bar so that's more drag. I will install trans cooler.

With or without fan???


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[06 H3]

I had one without fans but added one. I didn't get that hot often and I had skids a rack a winch sliders, more weight. Maybe your more then 50/50 coolant?

 

[amrg]

If you are doing the job then go for overkill, you can never overcool your trans / engine. A trans cooler may reduce coolant temps in the radiator, an added fan will help cool both the trans cooler and the radiator behind it.

 

[H3HummerLineX]

Makes sense. Fan it is. I will check coolant. Who knows what the mix is at this point. What's the best coolant to use?


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[rsc]

I don't know what coolant is "best", but never mix the old green coolant with the orange GM stuff or it will make jelly inside your engine. There ARE green fluids that are compatible, but double check first.