dusty0791 Posted December 19, 2012 Share Posted December 19, 2012 I have a 96 e7 454 it is running hot and there is no coolant pressure when I take the rad cap off doesn't matter weather or not I am pulling a load or empty or even idling still runs in the red. The bottom rad hose is ice cold and the top Luke warm anyone have a answer for me it would be appreceated Quote Link to comment https://www.bigmacktrucks.com/topic/28917-e7-454-no-coolant-pressure-and-running-hot/ Share on other sites More sharing options...
Lmackattack Posted December 19, 2012 Share Posted December 19, 2012 Bad water pump Bad thurmostat Sounds like you don't have flow or the thurmostat is stuck shut Quote Link to comment https://www.bigmacktrucks.com/topic/28917-e7-454-no-coolant-pressure-and-running-hot/#findComment-151995 Share on other sites More sharing options...
fjh Posted December 19, 2012 Share Posted December 19, 2012 Rad Cap ? or Thermastat or both! The fan can cause greif Kinda need more info! Quote Link to comment https://www.bigmacktrucks.com/topic/28917-e7-454-no-coolant-pressure-and-running-hot/#findComment-151996 Share on other sites More sharing options...
dusty0791 Posted December 19, 2012 Author Share Posted December 19, 2012 I just got the truck this weekend it had been sitting for a few months I topped up the antifreeze It was a bit low and it looks really dirty could it be a plugged water filter would this cause no circulation? I drove the truck for 1 load this morning and it worked fine then sitting idling while I was getting loaded is when it started to heat Quote Link to comment https://www.bigmacktrucks.com/topic/28917-e7-454-no-coolant-pressure-and-running-hot/#findComment-151997 Share on other sites More sharing options...
Lmackattack Posted December 19, 2012 Share Posted December 19, 2012 Don't think so but check it anyways. If i remember correctly The water system is a bypass system it filters coolant but also let's water by pass it if the flow thru it is restrictive. You need to check for coolant flow and see if the thurmostat is opening. Does your cab heat work? Quote Link to comment https://www.bigmacktrucks.com/topic/28917-e7-454-no-coolant-pressure-and-running-hot/#findComment-152001 Share on other sites More sharing options...
turckster Posted December 19, 2012 Share Posted December 19, 2012 When the engine is at operating temp (180 deg +) the upper radiator hose should be hot. If not, the thermostat is most likely the problem. If it is and the lower hose is cold the problem is in the radiator. A plugged water filter should not cause overheat problems. Kinda sounds like a bad thermostat. I would flush the cooling system as well. Check the radiator cap while your at it. Quote Link to comment https://www.bigmacktrucks.com/topic/28917-e7-454-no-coolant-pressure-and-running-hot/#findComment-152022 Share on other sites More sharing options...
dusty0791 Posted December 19, 2012 Author Share Posted December 19, 2012 Thanks for the info I will try that this morning and yes I am getting a bit of heat In the cab. I will let you know how it all turned out tonight. Quote Link to comment https://www.bigmacktrucks.com/topic/28917-e7-454-no-coolant-pressure-and-running-hot/#findComment-152034 Share on other sites More sharing options...
Lmackattack Posted December 19, 2012 Share Posted December 19, 2012 if you can get good hot heat in the cab, with the fan on Hi. that tells me that coolant flow should be working and the water pump is pushing coolant around the cooling system. Does sound like a bad T-stat.... remove it and replace while your in there. and if you want test the old one in a pot of water on the stove. you should see it open up as the water temp is getting hotter. if it does not open,you found where your problem was!Let us know. Quote Link to comment https://www.bigmacktrucks.com/topic/28917-e7-454-no-coolant-pressure-and-running-hot/#findComment-152042 Share on other sites More sharing options...
oilburner Posted December 19, 2012 Share Posted December 19, 2012 Are you sure it's running hot? We have a 95 ch that says it runs hot but you can smack the top of the dash and it goes to 180, maybe the gauge. Quote Link to comment https://www.bigmacktrucks.com/topic/28917-e7-454-no-coolant-pressure-and-running-hot/#findComment-152060 Share on other sites More sharing options...
theakerstwo Posted December 19, 2012 Share Posted December 19, 2012 Before you start replaceing parts at randon check heat gauge with temp gun and then check water pump belts to see if they are not slipping. Then install low low pressure guage in the block some were under the thermostat. With engine running at hi idle it should show a pressure of some were abouve 12 psi. If not then your belts are slipping or the impellow is slipping on the water pump. Quote glenn akers Link to comment https://www.bigmacktrucks.com/topic/28917-e7-454-no-coolant-pressure-and-running-hot/#findComment-152074 Share on other sites More sharing options...
oilburner Posted December 20, 2012 Share Posted December 20, 2012 I would thank if it has no pressure then it is not running hot, if it were running hot it would have lots of pressure from the hot water trying to turn to gas, it is the same as water boilling it does not matter if the pump was turning or not, if it were hot then it would push the water out the radiator cap. The old ch we use somtimes will show hot, but at the same time it will show that it has quit charging, you can hit the dash and the charge hand and the heat hand will almost change places it is like they are crossing some how, the heat hand will go from 3/4 of the way over to half, and the charging hand will go from 1/2 way to 3/4. It could also be the sending unit or the wire, but if it has no pressure i would all most bet it is not hot. Quote Link to comment https://www.bigmacktrucks.com/topic/28917-e7-454-no-coolant-pressure-and-running-hot/#findComment-152238 Share on other sites More sharing options...
dusty0791 Posted January 15, 2013 Author Share Posted January 15, 2013 Just turned out to be a stuck thermostat have been driving it for a while now and all of the sudden I lost my water temp guage not sure if its the sensor guage or a broken wire gonna do some chasing tomorrow Quote Link to comment https://www.bigmacktrucks.com/topic/28917-e7-454-no-coolant-pressure-and-running-hot/#findComment-157560 Share on other sites More sharing options...
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