running hot - Diesel Forum

parttime · 07-12-2009, 11:17 AM

alright guys my truck started running hot the other day just keeps getting hotter if i stay in it, if i stop it will cool back down but just as soon as i get back on the road again it will heat back up pretty quick.i changed the thermostat friday and it is still doing the same.seems to be circulating when i look in the resivoir.but here is something else when i shut the truck off and the water fills up the resivor it isnt going back down to the full cool line after it sits for a while.let it sit all night and it was full almost to the cap.after i started it up this morning and drove it to town the coolant level went down to full cold mark but when i shut it off it filled back up the resivor again,any thoughts?when i changed the thermostat i let it run for about 30 mins with the cap off so that it would bleed out the air.also here is something else when i drained the coolant from the pet**** drain only about a 1-1/2 gallons of fluid came out with the resivoir cap off,thought that was a little weird the when i broke the seal on the tstat housing the coolant came on out.HELP please.thanks

parttime · 07-12-2009, 01:21 PM

alright i have took the return hose coming off the heater coil off and i do have circulation.But i did find that the bottom radiator tank and hose is just as hot as the uppers.so i guess that i have found the answer to my problem.i will pull it out and get it rodded out the week.hopefully that is my problem.

sdan27 · 07-12-2009, 02:30 PM

so you're thinking that the radiator is not doing its job cooling like it should? had a tractor on our farm that was doing the same and i ran some heavy duty radiator cleaner through it and that took care of the overheating. might be easier/cheaper than pulling the radiator to get it cleaned at a shop.

ArrowHeadJim · 07-12-2009, 05:01 PM

Have you checked your fan clutch for proper operation?

How did you check the temps? With a guage or touchy feely method?

parttime · 07-12-2009, 06:10 PM

Quote:

Originally Posted by ArrowHeadJim

Have you checked your fan clutch for proper operation?

How did you check the temps? With a guage or touchy feely method?

at first it was by touch.but now i have done this.

well i have been messsing with it off and on all afternoon and got a infered themo. from a buddy and i dont think its the radiator cause there is like a 25 degree difference between the upper and lower hoses at the necks of the radiator.if i have the evo plugged in and in the data stream it shows the temp so i checked it at the tstat housing with the infered thermo. its reads within 1 to 2 dergrees difference and i checked the heater core lines and they read within 1 to 2 degrees also so i guess its the durn water pump.it is getting up in the 220 range with a short distance drive and will keep climbing if i continue driving so i will try a water pump and hopefully that will be my problem.i can get a h2o pump from advance with a lifetime warranty for around 125.00 so i guess i will go that route.

ArrowHeadJim · 07-12-2009, 06:26 PM

Keep use informed on the out come.

We like to see the cause and affects and the fix.

parttime · 07-12-2009, 06:43 PM

i will keep yall informed.i will be replacing the h2o pump tomorrow, just going t get 1 from ford instead of advance auto.