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Old 01-29-2010, 03:06 PM   eBay Motors  #1 (permalink)
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Overheating only while driving??

I was driving home from work yesterday and my truck started beeping and the "engine coolant hot" light came on. My truck is a 2003 LB7, the water pump was replaced about 3 months ago with all new coolant. After reading some posts last night I figured I would start with the t-stats, refill and bleed air, but it still didn't help. I also cleaned the reservoir cap. One thing that has me puzzled is it only overheats while driving. If I stop driving and let idle it cools back down to about 215* (which is pretty normal for my truck here in Florida). Can a crank driven water pump stop pumping?? The upper hose seems to get pretty stiff when hot, but when engine cools down it softens back up. I was thinking it might be the fan clutch because it has about as much resistance hot or cold (I'm not really sure how to check).Hopefully its not the injection cups or head gasket leaking pressure into the cooling system. No coolant has been leaking anywhere. Im just really puzzled on what to do next. Any info from you guys would be really appreciated.
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Old 01-29-2010, 05:48 PM   eBay Motors  #2 (permalink)
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Once your truck is fully warmed up, or even at the 215 mark, shut it off, then grab the fan and try to spin it. It should be very hard to spin immediately after shutting it down from 215 degrees.
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Old 01-29-2010, 05:54 PM   eBay Motors  #3 (permalink)
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Yeah sounds like its the fan clutch
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Old 01-29-2010, 06:03 PM   eBay Motors  #4 (permalink)
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Today after I did a test run after installing the new tstats I tried to turn the fan. It seemed to turn with about the same resistance as when its cold. After revving the engine it seems to change with the rpm. Could this same resistance matter when the motor is under load and not turn? As far as hearing it engage, Ive never really noticed.
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Old 01-29-2010, 06:11 PM   eBay Motors  #5 (permalink)
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I can here my fan clutch engage like a MOFO on my cummins, I would start with a clutch and go from there
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01 QC SB 47RE
Tinted WS and all others, Quad ADR, Raptor 150-DSV, 4" MBRP, 265s, soon to be more
2590.8 MM Western Straight Blade
RU "Sirius"
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