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Possible Intercooler Issue?

1322 Views 3 Replies 2 Participants Last post by  stephan
I need some advice. I dont' know if this is just my inexperience with diesels or a potential problem brewing.

I've noticed that once temps hit 80F or more my truck is running at about 210F instead of 185 (this is also the case on the highway with cruise control set at 70 - 2K RPM). The transmission oil temp will clime to the 200F mark, but usually stays closer to the ~ 170 mark (whatever is the normal op temp).

My concerns: Engine is not cooling to it's normal operational temperature even when cruising under no load. The coolant was changed out recently (about 10K - 15K miles / 4 months ago). Coolant levels have been consistant and there is no smell of coolant leaking.

Is it normal for there to be about a 30 degree temp difference between the oil and trans temps? I had read somewhere that the oil and trans temps sould be almost the same and shift consistantly together. If not, what could the problem be?

Thanks for any help.
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Are you asking about an intercooler for the turbo Sam? If you are, do you have pyrometers on your exhaust? Also, are you asking about engine oil temp, or engine coolant temp?
As for the trans temps & engine oil temps being the same, mine aren't, but I have an aux trans cooler on it. If yours has the radiator trans cooler, then it may run the same unless you're towing, then your trans temp could run a little hotter.
I appreciate the reply, Stephan. I was asking about the engine oil temp versus the trans oil temp. I don't have EGT or boost gauges yet, but I need to install some soon. Both temps never get above 210 based on the in-dash gauges, it just concerned me a little the oil temp stays around the 210 level for the majority of the trips even when running with no load.
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