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3324 Views 14 Replies 9 Participants Last post by  bersa45
Well here's the problem when i'm loaded up 10.5 camper, pulling 18ft trailer loaded approx. 6000lbs pulling a long grade and the pyro temps get around 725 and up but never exceeding 850-875 i get this very high pitched squeel.Back off the throttle it dies down put your foot back in it comes back up.Once you crest the hill and cruise for a mile or two and the pyro temps come back down 550-600 approx.noise goes away.It seems you've got to be into the hill for a couple of miles and the temps over 725 for a bit before the squell comes on,while doing this though there's no loss of power truck pulls real strong,what do you think??(TURBO ON THE WAY OUT??)
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Same problem here. Only when I'm pulling my 5th wheel (36 ft) up hills. No loss of power either but mine sounds like a fan running real real fast (whirling) but cannot imagine a fan under the hood could be this loud. I've seen some posts that claim its the fan kicking in for cooling but mine goes away right after I top the hill generally and sometimes just before if I don't put my foot in it. Honestly I don't know anything about these engines but if it really is the fan for cooling why would it go off so quickly (atleast in my case). It seems to me if the engine or tranny was too hot the fan would have to run for a while to cool all that fluid down.

Auto Jim any ideas?
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