Overheating

biggsy90 · Sep 5, 2008

So I know a lot of questions have been asked about this, I have searched endlessly and cant seem to find the answer. I have a 98 5.9 and when its 100 outside my temp gague starts climbing. not terrible, but enough to worry me.

Question is what temp am I getting to?? the furthest I have let the gauge get to is the next mark past the 210, but how hot is this? I would think about 225 or so, but I'm just not sure.
Only happens on the highway. wheeling or city it runs at or below 210. Heres what I have done so far. Hanson winch bumper modded to lower the winch to not block the grill. thermostat, water pump, 2 different new rads (currently running the 1 row all aluminum 1.5" core) Placed wind deflector under bumper to force air up toward lower radiator, Changed coolant at least 5 times, rad flush a few times, quick and 6 hour versions, water wetter.

Fans are working fine. Seems to me to be a radiator size/air flow problem. I realize that the winch and bumper dont help things much, but with everything else I have done, its running cooler that stock.

Any place besides Ron Davis for a larger aluminum radiator? I just cant spend 650 on a radiator.

Sorry for the basic questions, but I am getting really tired of this heating up.

Thanks
Bill

AndyZJ · Sep 6, 2008

220 won't hurt the engine. 240 is pushing it for sure when the gauge maxes out at 260. The thing to watch i.e. listen for is the PINGING. Remember regular tune-ups.

biggsy90 · Sep 6, 2008

Running stock 5.9 electic fans and again around town and slow speed, temp never gets higher than 200 or so. its only with highway driving.

I think 220 isn't bad for the motor, but I'm not sure if I'm at 220 or 240? Factory gauges I dont think are that accurate and thats why there are not more calibrations. i may try using a different sender and checking it with my trans temp gauge to see how hot it is running.
Bill

richp · Sep 5, 2008

Rule of thumb is low speed overheats are either fan clutch or water pump, hiway overheats are either radiator not working properly, plugged, corroded, etc or bad water pump. If both low speed and high speed, water pump.

GranderZJ · Sep 5, 2008

I'm having the same problems but mine gets to about 240, planning on gettin the Ron Davis when $$$ is available.
I think the next mark past 210 isabout 220-230, 210-220 isn't really going the cause ill affects, but getting higher for long periods will
What fan/fans are you running?

Overheating

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