Hot and Frustrated

[simple man]

HELP! I spent the money on the "KIT" to cool my 6.5 - water pump, dual thermostats and all of the other parts. BUT IT'S STILL OVER HEATS - sometimes seems worse. Originally it would live on 210 degrees - MT, no load and just cruzing around town - regardless of ambient temps, then when I would pull any size of load it would rapidly go over 210 degrees and then level out around 220 or so.

Now I have the "KIT" installed and : it takes about the same amount of time to get to 210 just cruzing town, but it still lives at that temp, unless I drive 60 MPH or less then it will gradually fall to 190 degrees or so and fluctuate between 190 and 210. BUT let me pull a load......and it climps quickly over 210 past 220 and heads to 240and above! It doesnt matter what speed I drive (I cant get it to pull a load over 60 mph anyways) any speed , any size load and it goes right over 210! It doesnt smoke, doesnt use water or have any of the typical "head gasket realted" symptoms.......so what is the problem! Can anybody help!???

[SCREAMINXL]

Have you cleaned your radiator? Could be due for a replacement.

[Chevylover]

What about a defective coolant temp sending unit ?
Just read about temperature from 240°F and above ? Normally at this temperatures you should have "killed" an engine. Perhaps sending unit or gauge fault or like SCREAMINXL mentioned "time for a new radiator or a complete cleaning inside and outside"

Cu,
Sven

[jifaire]

Before we spend any time on this...

Have you read the other posts on cooling these beasts?

This one, for instance: http://www.sixfiveturbodiesel.com/showpost.php?p=6041&postcount=8

Have you pulled your rad out of the truck and cleaned it properly (not the deposits inside the rad, the crap that plugs up the outside)?

see: http://www.sixfiveturbodiesel.com/showpost.php?p=5726&postcount=6

If not, then it doesn't matter if you have the dual-thermostat 'kit'.

Jim

[simple man]

Ok Guys,

I have pulled the rad out and washed , blew compresed air back thru fins, washed, blew compressed air back thru fins......repeatedly many times. I spent most of the day doing this task again and again.

While I must say that there was more crap in it than I suspected, I took it for a cruiz after putting it back togeter. While it did take longer to build up heat, it still hit that magic 210 degrees number! It was evening time, cool ambient temps (high 70's) and if at highway speeds it would easily hit 210, if I slowed to 55 or 60 it would cool back down to under 210??

Any ideas?:confused:

[TedReminder]

I can't imagine running that hot. Something has to be wrong. Mine is pretty much set up to stock specs with a 180º thermostat. I have about 6 thou miles on a fresh reman longblock and I doubt it has seen 190º even with some really hot days. The old engine I replaced due to broke crank @278 thou ran the same temps. I don't pull a trailer but I sure carry a lot of weight in the bed at times.
You might want to look at some basic stuff that might cause high heat. Pump timing will effect heat, where is yours set at? Still have a cat/soot trap in your exhaust? Plugged up cat might cause some heat.
All I can say, comparing yours to mine, is something ain't right.
Ted

[deerefanatic]

OK guys, my grandma's truck (stinkin no good piece of crap... I'll post a seperate thread on that) always runs 210 according to the dash gauge. BUT, when I hook a laptop to the OBD port and run GMTDScanBasic, the actual coolant temp is about 194F.... So, the gauge on the dash tends to read a little higher than what it really is... Just like the speedometer..... It's 1.5 mph fast........

So, if it's reading just a little high, be aware that it's not uncommon for the dash gauge to read as much as 15F hotter than actual.....

The only way to know for sure is hook up a code reader and get the temp straight from the ECU.. But that still doesn't tell you if the sender is sending the right temp in the first place! :D