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Now I understand 6.5L cooling... thanks Heath!

how hot?

So how hot have some of you guys seen towing loads? I have routinely seen my truck get to 250. I have A new radiator, cleaned all the coolers, have a high flow water pump. Reading this thread it sounds like that might be excessive.
 
Pre Heath on the '95 with HO water pump, dual crossover
180 F t-stats, routinely reached 225 towing a bass boat up to Big BeAr Lake, a 5600' elevation from bottom to highest point.

Same truck hit 235 on a slow rock hopping trek up a jeep trail to a peak at 9500'. The going there was just too slow to get any air flow and I just left the truck on at the top.

Same truck lost the belt going down a grade in 100 F heat in eastern Oregon about 10 miles south of Rome Oregon. It hit 260 in seconds and I shut her down as soon as I could find a place to turn off. Undoubtedly that was non-circulating coolant cooking near the exhaust manifold and not a true indicator of overall temp.

Post Heath, things are much better cept my temp is running hot over your avatar.
 
Acesneights1 said:
250 wayyyy too hot. You will damage something. How's the fan clutch ?
Click to expand...

X2 :thumbsup:

Waaay hot recipies for disaster, if you are above 210F on a consistent basis you need to be looking for why, and start looking now, with all my cooling mods 195 is my normal hot while towing, maybe 200 on a very heavy load or hot day with heavy load 18K type load.

If it happens while hauling a load; roll down the windows, slow down, turn on the windshield defroster to hot and start bleeding off some heat from the engine.

Please those of you who are saying you are hot 210+ hot, start an I am overheating thread of your own, we need to get those temps corrected before something serious happens, please stop towing now until we find out what is going on.
 
Thanks Doc!

:iagree: That is the biggest concern IMO with buying a used 6.5, what the PO perceived as too HOT especially with regards to where GM marked the OEM temp gauge red, the party is over by then :eek:

Doc is telling us ALL like it is, if it running HOT it ain't gonna last long if ya ignore it...:nono:
 
Acesneights1 said:
I hit 215-220 very briefly last tow but I was working the truck hard and I think the fan clutch mod will rectify it.
Click to expand...

Sustained heat is what I'm talking about Kenny, but any incursions above 210 need to be looked into it's amazing how much crud accumulates on the rad behind the ac condenser I suspect the gap between the 2 heat exchangers has a negative pressure area and the vacuum sucks in any nearby object. I once found a bird carcass in one I was cleaning yet no hole in the condenser, so it got sucked in around it.
 
Crankme69 said:
:iagree: That is the biggest concern IMO with buying a used 6.5, what the PO perceived as too HOT especially with regards to where GM marked the OEM temp gauge red, the party is over by then :eek:

Doc is telling us ALL like it is, if it running HOT it ain't gonna last long if ya ignore it...:nono:
Click to expand...


I would surmise that most of the dead 6.5s over the years can be directly correlated to that red mark GM put on the dash, folks driving at high boost not knowing high IAT comes with high boost and that contributes to overheat.

Then the odd lost WG going the other extreme of no boost, but folks not educated in the ways of the 6.5 "pouring on the coal" to it keeping temps in the "bottom" of the red zone not realizing EGT is thru the roof at each cylinder with all that black smoke a rolling out which is making the engine run hot.
 
Turbine Doc said:
Sustained heat is what I'm talking about Kenny, but any incursions above 210 need to be looked into it's amazing how much crud accumulates on the rad behind the ac condenser I suspect the gap between the 2 heat exchangers has a negative pressure area and the vacuum sucks in any nearby object. I once found a bird carcass in one I was cleaning yet no hole in the condenser, so it got sucked in around it.
Click to expand...

ah ah ah...You witnessed in person me pulling it apart and guilted me into making sure I did it thourouly....:D
Your excat words..."Don't dare make a post about overheating if you don't pull that rad outta there and clean all them coolers..."
Instructions were followed...:D:thumbsup:
 
what is it?

Well I had wondered about the fan, as my ac quite working too, and then would come back later. I talked to bill heath on the phone yesterday and he thinks that the gauge may be reading wrong. I am going to do some further looking around to figure out exactly what is going on here.
 
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