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overheating issue, but why?

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Old 02-09-2008, 07:32 AM   #1
93_five_oh
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Default overheating issue, but why?

for those who don't like to read... just read the bold. lol

Ok... so ever since i got my under drive pulleys my car gets warmer than usual if i just sit and idle for a long time after driving around. for the past few months it will get really really hot when i sit and idle. (i don't just sit much, so it's not a huge issue) but when you take your girlfriend to work at 5:30 am and it's 30 degrees out, you don't want to shut the car off. her manager was late to work so i was forced to wait about 35 min. after about 25 i remembered my car get too hot, so i shut the engine off. the temp gauge wasn't at max, but it was a whole lot hotter than it should be.
after a few minutes my girlfriend noticed "pretty fog" coming from the font. there was steam shooting from the rad cap... i think. i'm not sure if there is a leak right by the filler neck or if the cap leaks a little because there is usually some anti freeze right around there.
when i finally drove off i had to go real easy because it was pinging like crazy. my car already pings for some unknown reason, so this didn't help things.
after less than one minute on the freeway the temp gauge was showing waaaay low then after a few minutes it was normal.

does anybody have any ideas where i should start? t-stat maybe? would a radiator leak cause this? any input would be really helpful!

thanks!
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Old 02-09-2008, 08:04 AM   #2
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Default RE: overheating issue, but why?

If it's cool while driving then i would say your rad is fine. Could be pump or t stat. About 4 weeks ago i left my 93 f-250 running over nite like a dumbass. 9 hours and it was no hotter than usual. I'd say my cooling system is pretty good, lol. A leak itself wont cause it to overheat unless unless your running low on fluid. The UD pully's are not helping either. Some people have charging and over heating issue's with them. What' your coolant look like. Has it ever been flushed?
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Old 02-09-2008, 08:11 AM   #3
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Default RE: overheating issue, but why?

Thanks. I flushed it over the summer... never replaced the t-stat though. let me look to see if it's ever been replaced at all. it's not low on coolant... i'm guessing it's the thermostat. although my brothers ranger blew a heater hose AND a rad hose cause it failed shut...
could it be half open or something like that, so it only cools effectively when there is a lot of air flowing over the radiator?
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Old 02-09-2008, 08:25 AM   #4
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Default RE: overheating issue, but why?

the ud pullies arent helping you any with this i would get rid of them they dont do anything but cause problems. you said you had steam coming from your rad cap. you might want to replace that it sounds like its not holding pressure that well so its not increasing the boiling point of the coolant which may have causes it to make "pretty fog". check your water pump look at the weap holes on the bottom and top and see if they are leaking anything at all it could be such a small leak that it wont drip onto the ground or really show a problem with coolant leaves you can also check the end play of the pump by trying to move the fan around if it wiggles you might have a bad bearing in the pump. as for the t-stat try replacing it with a 180* instead of the stock 195*
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Old 02-09-2008, 08:50 AM   #5
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Default RE: overheating issue, but why?

thanks guys... i just replaced the cap with a napa cap thinking that might be the problem. looks like it was a bad choice?
I checked.. the t-stat was replaced approx. 50k miles ago. The water pump was replaced 34k miles ago... in case that would make a difference. i'll still check though.
the radiator cap is 16 lb right?
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Old 02-09-2008, 08:57 AM   #6
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Default RE: overheating issue, but why?

well it seems like everything is new it would be your ud pullies get rid of them
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Old 02-09-2008, 09:05 AM   #7
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Default RE: overheating issue, but why?

awe dang it. i guess i gotta call my parents and have them send them. lol
that sucks...
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Old 02-09-2008, 09:16 AM   #8
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Default RE: overheating issue, but why?

haha
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Old 02-09-2008, 12:45 PM   #9
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Default RE: overheating issue, but why?

ok.. so the pulleys will be on their way soon.
I noticed the upper radiator hose is soft, when it's hot. As in it's not pressurizing. When i squeeze it i can hear air escaping from the top of the radiator. That means there's a leak/hole. I don't lose any antifreeze.. at least it takes a long time for it to get low.
So my question is: If the system is not pressurizing, will that cause it to run hotter?
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Old 02-09-2008, 01:01 PM   #10
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Default RE: overheating issue, but why?

yup it will. when you put pressurize a liquid it raises his boiling point so by not having the coolant under pressure it lowers the boiling point back down to normal and will cause it to boil in the engine and overheat. go to autozone and rent or buy a cooling system pressure tester kit that will show you were your leak is
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Old 02-09-2008, 01:01 PM   #11
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Default RE: overheating issue, but why?

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ORIGINAL: 93_five_oh

ok.. so the pulleys will be on their way soon.
I noticed the upper radiator hose is soft, when it's hot. As in it's not pressurizing. When i squeeze it i can hear air escaping from the top of the radiator. That means there's a leak/hole. I don't lose any antifreeze.. at least it takes a long time for it to get low.
So my question is: If the system is not pressurizing, will that cause it to run hotter?
Yes it can, why did you say the radiator cap was a bad choice? I would get a pressure tester and see if you can find the leak, a bad radiator cap can also make your system not pressurize, even new stuff can be bad, I would take the cap back and see if that is the problem. Put back your regular pullies too. Like Hack said, they are not worth the trouble.

Hack beat me to it again.
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Old 02-09-2008, 01:09 PM   #12
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Default RE: overheating issue, but why?

OK lets see, This is straight out of the ford manual..

When the coolant is cold, the thermostat is in the closed position and the coolant flow is
restricted to the cylinder block, head, intake manifold and heater. As the temp increases, the t-stat opens allowing a portion of the coolant to pass into the radiator. The coolant flows throught the radiator tubes and is cooled by air passing over the cooling fins. Coolant is then
circulated from the radiator outlet tank through the water pump and into the cylinder block to complete the circuit.
The coolant expands as the temp and pressure rise in the system. When the limiting system working pressure is reached, the pressure relief valve in the radiator filler cap is lifted from its seat and allows coolant to flow throught the radiator filler neck and the overflow hose
into the coolant recovery resorvoir.
When the system temp and pressure drop, the coolant contracts in volume and the pressure in the radiatoris reduced. The coolant in the resorvoir bottle will then flow into the radiator through the vacuum relief in the radiator filler cap.

It sounds like to me your t-stat is stuck open , that is why it takes so long to overheat. it has to heat up all the fluid in the system . As far as the underdrive pulleys, you shouldn' t see much temp change maybe some, but not excessive. An electric fan will fix that. Good Luck.
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Old 02-09-2008, 01:09 PM   #13
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Default RE: overheating issue, but why?

yeah i'm gonna put the old pulleys back on when they arrive. well for a minute this morning when the steam was coming out of the radiator it looked like it was coming from the cap, but earlier when i squeezed the hose i could hear a little hissing and see some antifreeze about 3 inches over on the top row of the radiator... so i'm pretty sure that's where the hole it. can i take it to a shop and get it fixed?
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Old 02-09-2008, 01:12 PM   #14
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Default RE: overheating issue, but why?

Oh yeah I believe the hissing sound is the coolant going through the preesure cap into the overflow tank, normal.
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Old 02-09-2008, 01:16 PM   #15
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Default RE: overheating issue, but why?

no no... other side of the cap. and doesn't there have to be enough pressure on the cap to let excess coolant into the overflow?
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Old 02-09-2008, 01:22 PM   #16
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Default RE: overheating issue, but why?

Start with the easiest, cap and t-stat. I really doubt with all the people running underdrive pulleys your the only one with problems. Mine has em and it runs hot butI attribute that to
The h/c/i on the car.
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Old 02-09-2008, 01:25 PM   #17
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Default RE: overheating issue, but why?

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ORIGINAL: 93_five_oh

yeah i'm gonna put the old pulleys back on when they arrive. well for a minute this morning when the steam was coming out of the radiator it looked like it was coming from the cap, but earlier when i squeezed the hose i could hear a little hissing and see some antifreeze about 3 inches over on the top row of the radiator... so i'm pretty sure that's where the hole it. can i take it to a shop and get it fixed?
yeah you can take the car to the shop and have them replace your radiator but its easy enough to do yourself in the driveway. as for the radiator yeah you can take it to a radiator shop and have them patch it and pressure test it for you. and yes swap back your pullies they cause more headaches than you need.

91 you really didnt help any with your little story thing there. the coolant system when hot t-stat open) has a constant 14-16psi. you shouldnt hear a hiss from the over flow when the system is hot it will suck the coolant out of the over flow when you turn your car off then you will here a hiss from it because its filling the over flow and releiving pressure in the system. the one reason why they tell you to never open your rad cap when hot is because yes its under pressure but the moment you open that cap you releive all that pressure and you just decreased the boiling point so the coolant boils instantly and can seriously hurt you and yes the pullies will cause an overheating problem they spin the water pump and alt a lot slower there for causing problems because they arent running the way they were intended
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Old 02-09-2008, 04:02 PM   #18
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Default RE: overheating issue, but why?

If you get a new thermostat, make sure you check it before putting it in your car. I got a new 180 degree t-stat and come to find out it was stuck open [:@]. Took it back, got my money back and bought a stock replacement. Works great
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Old 02-09-2008, 04:42 PM   #19
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Default RE: overheating issue, but why?

thank you 91. i know how a thermostat works though. like you stated and i already said... the radiator cap won't allow coolant out until the system has enough pressure. 16 lbs.
and like i said before... it is NOT pressurizing because when the upper radiator hose is HOT there is no pressure in it. yes i squeezed it. like we agreed on, if the system won't pressurize it won't cool properly.
i'm blaming it on a leak for now... i'll pressure test it and then know. anyways, if it is a leak like i think it is, i'm getting it repaired, since it's a fluidyne radiator.

thank you all for your help!
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Old 02-09-2008, 04:59 PM   #20
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Default RE: overheating issue, but why?

Did you ever think of your clutch fan going bad anybody? I Had that happen on my 82 and replaced everything and still did it, changed to a electric fan and ran cold till I sold it! I doubt your underdrive pulley would really matter on your waterpump because that pulley isnt changed in diameter like the crank pulley would be correct?
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Old 02-09-2008, 04:59 PM
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