garcia26233 Posted December 2, 2010 Share Posted December 2, 2010 Hello to all. Winter is peaking it's head in Texas and I'm running a cool motor. I've had this motor installed a couple months back and temp. hadn't being a issue till now. When I run in the highway and it's 45f-55f degrees outside it reads water temp at or just over 100f and it won't warm up till I stop moving. Temp will be normal as long as its not cold out and on highway, same thing with heater. What can I do or check?? Only thing I can think of is trying a winterfront but I've never had this issue before and don't think it's that cold outside. Can it be the thermostat? Quote Link to comment https://www.bigmacktrucks.com/topic/16710-running-cold/ Share on other sites More sharing options...
hatcity Posted December 2, 2010 Share Posted December 2, 2010 Is the fan running constant? Or does it cycle?Always on will pull in that cooler air.Thermostat may be stuck open and keep cycling cooler fluid. Quote Success is only a stones throw away.................................................................for a Palestinian Link to comment https://www.bigmacktrucks.com/topic/16710-running-cold/#findComment-67839 Share on other sites More sharing options...
oldmacktrucks Posted December 2, 2010 Share Posted December 2, 2010 Try checking the thermostat, could be a cool running stat. If so I would replace with a 180 degree Quote Link to comment https://www.bigmacktrucks.com/topic/16710-running-cold/#findComment-67844 Share on other sites More sharing options...
Lmackattack Posted December 2, 2010 Share Posted December 2, 2010 What motor?sounds like the water level is low or the thurmostat is missing/stuck open.Check water level in rad, if topped off pull thurmostat and replace with a new one that is correct for the engines operating temp. Quote Link to comment https://www.bigmacktrucks.com/topic/16710-running-cold/#findComment-67857 Share on other sites More sharing options...
leversole Posted December 3, 2010 Share Posted December 3, 2010 Duh!!!!!!!!!!!I have been fighting a cool runing motor...I covered about 3/4's of the radiator today to ge the temp above 120...went up only a few degree...Dont know WHY I did not think of the thermostat! Probably stuck open...have a new task tomorrow! Quote Link to comment https://www.bigmacktrucks.com/topic/16710-running-cold/#findComment-67865 Share on other sites More sharing options...
Lmackattack Posted December 3, 2010 Share Posted December 3, 2010 Duh!!!!!!!!!!!I have been fighting a cool runing motor...I covered about 3/4's of the radiator today to ge the temp above 120...went up only a few degree...Dont know WHY I did not think of the thermostat! Probably stuck open...have a new task tomorrow!your old B model, if not worked, will run cold all the time in the winter months. make sure the shutters close when cold and open when hot. need to work them to get to 180, My R model mack will not go over 160 when started and left to idle in 20-30 deg weather. but as soon as I start working it she comes up to 180 and holds. Quote Link to comment https://www.bigmacktrucks.com/topic/16710-running-cold/#findComment-67872 Share on other sites More sharing options...
garcia26233 Posted December 5, 2010 Author Share Posted December 5, 2010 Is the fan running constant? Or does it cycle?Always on will pull in that cooler air.Thermostat may be stuck open and keep cycling cooler fluid.Fan is not constant. Quote Link to comment https://www.bigmacktrucks.com/topic/16710-running-cold/#findComment-68011 Share on other sites More sharing options...
garcia26233 Posted December 5, 2010 Author Share Posted December 5, 2010 What motor?sounds like the water level is low or the thurmostat is missing/stuck open.Check water level in rad, if topped off pull thurmostat and replace with a new one that is correct for the engines operating temp.Motor is a '99 E7 460hp. Water level is fine. This only happens when I'm driving, if I stop and store or job site it warms up nice but if hit the road temp drops again. Quote Link to comment https://www.bigmacktrucks.com/topic/16710-running-cold/#findComment-68012 Share on other sites More sharing options...
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