Overheating
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From: Hernando, ms
Overheating
Please double check me on my troubleshooting an overheating problem.
'93 F150 4X4, 5.0L, AOD tranny. Started intermittently running hot, then would cool off, then run hot again. Checked the temp indicator per Haynes manual checked O.K.. Changed the temp sending unit. Same problem. Changed the thermostat. Same problem. Checked the fan clutch per the Hayes manual and it failed both checks! Changed fan clutch. Fan clutch now works as advertised, passed checks. Same problem. Hose's are new. Water pump changed last year (due to leaking) and water is circulating in the system. Leads me to think the radiator is some how the culprit. Only thing left to change!!! But could a partial plugged radiator cause these intermittent symptoms???? Thanks for any help!! 'Mo
'93 F150 4X4, 5.0L, AOD tranny. Started intermittently running hot, then would cool off, then run hot again. Checked the temp indicator per Haynes manual checked O.K.. Changed the temp sending unit. Same problem. Changed the thermostat. Same problem. Checked the fan clutch per the Hayes manual and it failed both checks! Changed fan clutch. Fan clutch now works as advertised, passed checks. Same problem. Hose's are new. Water pump changed last year (due to leaking) and water is circulating in the system. Leads me to think the radiator is some how the culprit. Only thing left to change!!! But could a partial plugged radiator cause these intermittent symptoms???? Thanks for any help!! 'Mo
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From: south Baja Mexico
alto of things can cause what you are saying. the first thing you need to do is stick a good thermometer in the radiator fill and see what is going on there.
you changed the thermostat, what temperature is it? how long ago did you chaing it.
Have you drained and flushed your system in the past year?
DID YOU REPLACE ALL OF THE HOSES?
how much fluctuation are you getting? some is normal
is this happening while you are driving or will it do it while idling?
Bruce
you changed the thermostat, what temperature is it? how long ago did you chaing it.
Have you drained and flushed your system in the past year?
DID YOU REPLACE ALL OF THE HOSES?
how much fluctuation are you getting? some is normal
is this happening while you are driving or will it do it while idling?
Bruce
Last edited by Bruce R Leech; Jun 16, 2007 at 04:12 PM.
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From: Hernando, ms
Originally Posted by Bruce R Leech
alto of things can cause what you are saying. the first thing you need to do is stick a good thermometer in the radiator fill and see what is going on there.
you changed the thermostat, what temperature is it? how long ago did you chaing it.
Have you drained and flushed your system in the past year?
DID YOU REPLACE ALL OF THE HOSES?
how much fluctuation are you getting? some is normal
is this happening while you are driving or will it do it while idling?
Bruce
you changed the thermostat, what temperature is it? how long ago did you chaing it.
Have you drained and flushed your system in the past year?
DID YOU REPLACE ALL OF THE HOSES?
how much fluctuation are you getting? some is normal
is this happening while you are driving or will it do it while idling?
Bruce
System was drained and flushed last winter
Upper, lower radiator hoses changed and the bypass hose when water pump changed.
Goes from normal 1/2 of indicator to hot and back. Sometimes when it goes hot it will come back to normal slowly and sometimes it won't cool off.
Happens when driving.
Haven't tried thermometer in tank but figure when it boils over, fills the plastic tank and runs on the ground, its HOT.
Still puzzled!!!! 'Mo
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From: south Baja Mexico
did this start right after you changed the water pump or before?
I am having trouble hanging this on the radeator becalus you say it overheats and then it will cool down and be fine for a while. dose it seem to heat up more when you have it under heavy lode or dose that not make a difference?
a while back I bought a set of hoses at Napa for a customer's car and while installing them I put the spring in the lower hose and out of the other end popped a ball of plastic wrap that had been put in there. I would never have found it if I hadn't put the spring in it, and that would have haunted me for quit a while trying to figure out why that truck was over heating. since then I always poke something through every hose before I put it on,
Bruce
I am having trouble hanging this on the radeator becalus you say it overheats and then it will cool down and be fine for a while. dose it seem to heat up more when you have it under heavy lode or dose that not make a difference?
a while back I bought a set of hoses at Napa for a customer's car and while installing them I put the spring in the lower hose and out of the other end popped a ball of plastic wrap that had been put in there. I would never have found it if I hadn't put the spring in it, and that would have haunted me for quit a while trying to figure out why that truck was over heating. since then I always poke something through every hose before I put it on,
Bruce
Last edited by Bruce R Leech; Jun 18, 2007 at 02:13 PM.
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From: Hernando, ms
Originally Posted by Bruce R Leech
did this start right after you changed the water pump or before?
Bruce
Bruce
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From: Hernando, ms
Originally Posted by Bruce R Leech
did this start right after you changed the water pump or before?
I am having trouble hanging this on the radeator becalus you say it overheats and then it will cool down and be fine for a while. dose it seem to heat up more when you have it under heavy lode or dose that not make a difference?
a while back I bought a set of hoses at Napa for a customer's car and while installing them I put the spring in the lower hose and out of the other end popped a ball of plastic wrap that had been put in there. I would never have found it if I hadn't put the spring in it, and that would have haunted me for quit a while trying to figure out why that truck was over heating. since then I always poke something through every hose before I put it on,
Bruce
I am having trouble hanging this on the radeator becalus you say it overheats and then it will cool down and be fine for a while. dose it seem to heat up more when you have it under heavy lode or dose that not make a difference?
a while back I bought a set of hoses at Napa for a customer's car and while installing them I put the spring in the lower hose and out of the other end popped a ball of plastic wrap that had been put in there. I would never have found it if I hadn't put the spring in it, and that would have haunted me for quit a while trying to figure out why that truck was over heating. since then I always poke something through every hose before I put it on,
Bruce
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From: south Baja Mexico
It is possible but not very likely. the new hoses dont come with them you need to take the old one out and put it in the new hose or buy it separate. but many dont have one at all and they seem to work OK. the only time it could collapse is when it is cooling down and the pressure drops to a negative. so I dont think that is your problem .
If I could get some more info about when you are having this problem and how often and what you are doing when it happens I think I could help you out.
Bruce
If I could get some more info about when you are having this problem and how often and what you are doing when it happens I think I could help you out.
Bruce
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From: Hernando, ms
Originally Posted by Bruce R Leech
It is possible but not very likely. the new hoses dont come with them you need to take the old one out and put it in the new hose or buy it separate. but many dont have one at all and they seem to work OK. the only time it could collapse is when it is cooling down and the pressure drops to a negative. so I dont think that is your problem .
If I could get some more info about when you are having this problem and how often and what you are doing when it happens I think I could help you out.
Bruce
If I could get some more info about when you are having this problem and how often and what you are doing when it happens I think I could help you out.
Bruce
After driving for about 5 minutes after a cold start, the temp comes up to a little above normal then drops to normal. My temp indicator needle for "normal" is between the R and M in the word normal on the indicator(been that way since i bought the truck in '93). After approx. 20-25 miles the temp indication starts rising and approaching the hot end of the scale. Sometimes it will come down some but often it just stays towards the hot end of the scale. When in town(I live out in the country) it will do it quicker. If I stop and shut the engine off while its over towards hot, the radiator boils over on to the ground. Crazy thing is it doesn't do it every time I drive the truck. I would say three out of 5 trips it does its thing!!! Hope this helps. 'Mo
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From: south Baja Mexico
OK it sounds like maybe 2 things.
first if your water and antifreeze mixture is boiling out on to the ground then you ether have a bad radiator cap or the hose going to the overflow reservoir is leaking. if this is the case it is sucking air and not coolant back in when it cools then you have a air bubble in the system the next time you drive it and this can calus the over heating. so fix this first buy replacing the cap with a new one of at least 13 to 15 lbs replace the hose with a new one and make sure it fits tite on both ends and is of a type that wont collapse with vacuum. fill the reservoir not more than half way or to the line on the reservoir. refill the radiator to the top and let a little run down the overflow tube. drive it a day or 2 and see if it isn't better.
second if it is still overheating pull the radiator and have it cleaned professionally.
Bruce
first if your water and antifreeze mixture is boiling out on to the ground then you ether have a bad radiator cap or the hose going to the overflow reservoir is leaking. if this is the case it is sucking air and not coolant back in when it cools then you have a air bubble in the system the next time you drive it and this can calus the over heating. so fix this first buy replacing the cap with a new one of at least 13 to 15 lbs replace the hose with a new one and make sure it fits tite on both ends and is of a type that wont collapse with vacuum. fill the reservoir not more than half way or to the line on the reservoir. refill the radiator to the top and let a little run down the overflow tube. drive it a day or 2 and see if it isn't better.
second if it is still overheating pull the radiator and have it cleaned professionally.
Bruce
Thread Starter
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Member
Joined: Jan 2007
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From: Hernando, ms
Originally Posted by Bruce R Leech
OK it sounds like maybe 2 things.
first if your water and antifreeze mixture is boiling out on to the ground then you ether have a bad radiator cap or the hose going to the overflow reservoir is leaking. if this is the case it is sucking air and not coolant back in when it cools then you have a air bubble in the system the next time you drive it and this can calus the over heating. so fix this first buy replacing the cap with a new one of at least 13 to 15 lbs replace the hose with a new one and make sure it fits tite on both ends and is of a type that wont collapse with vacuum. fill the reservoir not more than half way or to the line on the reservoir. refill the radiator to the top and let a little run down the overflow tube. drive it a day or 2 and see if it isn't better.
second if it is still overheating pull the radiator and have it cleaned professionally.
Bruce
first if your water and antifreeze mixture is boiling out on to the ground then you ether have a bad radiator cap or the hose going to the overflow reservoir is leaking. if this is the case it is sucking air and not coolant back in when it cools then you have a air bubble in the system the next time you drive it and this can calus the over heating. so fix this first buy replacing the cap with a new one of at least 13 to 15 lbs replace the hose with a new one and make sure it fits tite on both ends and is of a type that wont collapse with vacuum. fill the reservoir not more than half way or to the line on the reservoir. refill the radiator to the top and let a little run down the overflow tube. drive it a day or 2 and see if it isn't better.
second if it is still overheating pull the radiator and have it cleaned professionally.
Bruce