38ryr88 Posted June 12, 2009 Share Posted June 12, 2009 I have an 04 F-250 late build that came in for overheat concern with the di-gas cap venting. Vech has 50k miles and had headgaskets,oil/egr coolers done at 37k miles. No Dtc's or external leaks. Cap would release at approx 12 psi so I replaced it. Egr cooler holds vacuum for well over 15 min. ect/eot was max 14 degree F difference on flat ground with little load. Vech is just out of 5/100. Drove vech approx 15 miles to a spot where there was a steady incline so I could put a load on the engine. In less than 3 miles ect spiked to 253 and eot was 240 before I reached the next exit.Cooling fan is operating properly. I figured that the higher ect temp was related to a coolant flow concern since the eot was lower than the ect. I checked the water pump impeller and t-stat and both are in good condition. I was wondering if I am missing something obvious. Havent seen such an high ect reading while peforming 09-8-3 before. Was hoping toget a few opnions here. Thank You Quote Link to comment Share on other sites More sharing options...
Mekanik Posted June 12, 2009 Share Posted June 12, 2009 What is your cooling system pressure when is is overheating? Anything restricting airflow through the radiator? Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted June 12, 2009 Share Posted June 12, 2009 I would re-verify the cooling fan operation and then I would install a new T-stat and reevaluate. Did you remove the water pump to inspect it and the front cover? Also check your cooling stack for debris. Paper and leaves have a strange way of collecting between the coolers and on occasion I see grass laced in the cooling fins. Quote Link to comment Share on other sites More sharing options...
Gary_P Posted June 12, 2009 Share Posted June 12, 2009 Why not check the radiator for flow? Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted June 12, 2009 Share Posted June 12, 2009 Not something to be over looked I suppose, but how will you do that? Used to be a time you could take the radiator cap off end look right into the radiator tank and observe flow and look for build up. Now you cant... unless you use a borescope. Send it out to a radiator shop? Is it worth it on a high mileage truck? Just bouncing ideas around... Quote Link to comment Share on other sites More sharing options...
Bruce Amacker Posted June 12, 2009 Share Posted June 12, 2009 how will you do that? Have you guys ever seen one of these? It's a coolant flow tester. I think it used to be a required tool for GM, but I'm not sure it's even in production anymore. Coincidentally, Hickok is headquartered in Cleveland and Anthony and I are having lunch with the VP today to discuss a new 6.0 injector tester.. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted June 12, 2009 Share Posted June 12, 2009 .......................................................All hail the king of tools and gadgets! . . ......................................................................... . . ............................................... ..... ..... ..... ..... Quote Link to comment Share on other sites More sharing options...
LARRY BRUDZYNSKI Posted June 12, 2009 Share Posted June 12, 2009 May sound stupid and I'm sure you already have checked, But have you checked to see if the hoses might be collapsing? Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.