Check the front of the radiator to see if it is clean. I have seen them covered with bugs, cottonwood tree fluff and other such Items. One event had a piece of clear plastic that covered about 75 % of the radiator surface. Martin K wrote: >My head says maybe he has a blockage in one (or more) of the radiator >passages. That would easily keep the radiator from working as it should. >-- >Martin K > >PicDude wrote: > > > >>I would expect that you'd easily find something that can withstand 130 deg-C. >>Check out places like www.gemssensors.com . >> >>Otherwise, could you make it like a mass-air sensor? -- ie: resistive heating >>element that gets cooled by the fluid flow. >> >>BTW, flow is probably not the issue if the cooling system works decently when >>lightly loaded on level roads. Too much flow rate can sometimes be worse as >>it does not have enough contact time with the hot engine parts to absorb >>heat. You should probably be looking at oil temps and transmission temps >>instead, and possibly using an oil cooler and/or transmission fluid cooler. >>If the cooling system really is not operating up to par, then a better >>(multi-core) radiator may help. A quick experiment to see if the cooling >>system is really the primary issue is to use a mixture with more water, and >>add some water-wetter. See if that makes a difference. >> >>Cheers, >>-Neil. >> >> >> >>On Wednesday 21 June 2006 03:01, Gus S Calabrese wrote: >> >> >> >> >>>My truck overheats when I am pulling a small load uphill. >>>I do not think it should overheat. I am working on instrumenting >>>various parts of the cooling system. I would like to insert some kind >>>of flow detection in the hose that leads to the top of the radiator. >>>I would >>>like to get 3 or 4 bits of flow rate info. Does not have to be >>>terribly linear. >>> >>>Any suggestions ? How do piezoelectrics do in a 130 degree Celcius >>>wet environment ? >>> >>> >>>Gus S Calabrese AGSC >>>Denver, CO >>>720 222 1309 303 908 7716 cell >>>I allow everything with "spamcode2006" in the subject or text to >>>pass my spam filters >>> >>> >>> >>> -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist