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help!! overheating

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Old 03-29-2008, 01:52 PM   #1
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Default help!! overheating

ok so heres the deal...86 gt bone stock....it has been running hot occasionally and acting like the tsats was sticking so i replaced it...let the car idle for about 20 mins and the temp went to hot...if i rev the engine for a few seconds the temp comes down...not sure how to check the water pump...its not making any sqeeling noises...the radiator looks original but seems in good shape inside...i have good heat..my other thought was ...i had the bottom of the exhaust apart and one of the rear stock cats was clogged so i reamed them both out but couldnt get the header to pipe bolts off so i couldnt check/ream the upper cats...could a clogged cat cause this problem?by thye way i put a 195 tstat in.and help would be great...thanx ...john
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Old 03-29-2008, 03:27 PM   #2
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Default RE: help!! overheating

so if you drive the car does it overheats? or just at idle?check your fan clutch. have you pressure tested your car. i have a 195 but when i do my engine work i'm gonna put the 180 mr gasket thermostat in
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Old 03-29-2008, 05:38 PM   #3
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Default RE: help!! overheating

i dont think a clogged cat would cause the engine to over heat, i would think that you would see it glowing red or it would be very sluggish, and possibly keep stalling, the easy way to see if your water pump is good pop open your raidator cap and watch the fluid on top, if it is swirling its good, it maybe hard to see sometimes...

but as for the over heating part i would tend to agree that your clutch fan is no good or your raidator is bad...if you can rev your engine and it cools down i would seem to me the water pump is weak, are you leaking any fluid threw the weep hole on the water pump you can see this hole on top of the water pump
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Old 03-29-2008, 06:04 PM   #4
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Default RE: help!! overheating

not leaking any fluid at all....ive never been able to actually see the coolant swirling in any of my stangs...with the cap off it rises and falls...im thinking maybe the fan clutch...never had to deal with one but theres a first time for every thing...any idea how to check it? also how would i check the radiator for flow?...i was also under the impression that if my water pump was bad i wouldnt have consistant heat
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Old 03-29-2008, 06:14 PM   #5
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Default RE: help!! overheating

i could always see my antifreeze swirling in mine, you look straight down at it at idel and see a small swirl going down the filler tube in the radiator

i dont really know how to check a clutch fan to see how it works i always ran a flex fan or an electric fanon all mine so i never had to deal with that problem, if it was a bad water pump as well you would still have heat because you heat comes from the two metal rails on the pass side of your intake located just behind your thermostat,just your flow will not be as consistant causing it to over heat faster
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Old 03-29-2008, 06:31 PM   #6
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Default RE: help!! overheating

there should be no play when you grab the blades and move them side to side. it should feelvery smooth and kinda stiff. it shouldn't move freely.
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Old 03-29-2008, 10:10 PM   #7
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Default RE: help!! overheating

Check all of your hoses, and your head gaskets.
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Old 03-30-2008, 07:18 AM   #8
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Default RE: help!! overheating

thanx for all the input...hoses are fine and as for the head gaskets there is no oil in the coolant and no coolant in the oil.....im thinking water pump as there is definately no swirling in the radiator
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Old 03-30-2008, 08:03 AM   #9
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Default RE: help!! overheating

20 plus year old car, could be a clogged radiator, was it ever flushed?
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Old 03-30-2008, 09:49 AM   #10
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Default RE: help!! overheating

i suppose it could be the radiator...not sure if it was ever flushed....when the car is running at temp i feel no fluid moving in the upper hose...the lower hose feels warm and i see no fluid moving in the radiator
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Old 03-30-2008, 11:21 AM   #11
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Default RE: help!! overheating

when does it overheat?? sitting still at idle or at cruise down the road?? after replacing t-stat you did bleed cooling system/purge of all air by running it with heat on until heat was good and hot right??
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Old 03-30-2008, 11:52 AM   #12
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Default RE: help!! overheating

it does it at idle and after a 15-20 min ride...and yes i bled the system
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Old 03-30-2008, 11:55 AM   #13
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Default RE: help!! overheating

so no overheat while cruising down the road right?? just after a drive and sitting still?? if so make sure condensor in front of radiator and radiator fins are all free of any dirt/ debris and it most likely in such instances is a bad clutch fan..= replace an restest and cheap insurance is a new radiator cap also
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Old 03-30-2008, 12:00 PM   #14
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Default RE: help!! overheating

it did do it once going down the road...what concerns me is a lack of fluid...or i cant feel the fluid going threw the top hose as well as seeing no cerculation in the radiator
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Old 03-30-2008, 12:02 PM   #15
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Default RE: help!! overheating

i say it's a fan clutch... also a bad fan clutch can cause a water pump to fail... i would replace both.
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Old 03-30-2008, 12:10 PM   #16
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Default RE: help!! overheating

ok...im really confused about the whole fan clutch thing....ive checked for loosness and there is none..it seems to work as it should
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Old 03-30-2008, 01:38 PM   #17
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Default RE: help!! overheating

Sorry I missed your message, just got back online. I also noticed that you have undersized pulleys, I've heard this can be an issue. Also, you could have a air pocket in the system, this will prevent the fluid from flowing. I would stick to the basics, I would start with a flush and refill.
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Old 03-30-2008, 02:00 PM   #18
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Default RE: help!! overheating

hey mustang 86...no underdrive pullies...that was on my 91...i bled or burped the system....no air pockets...leaning towards water pump now...as there is no flow that i can see and i dont feel any rushing threw the upper hose when its running
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Old 03-30-2008, 07:50 PM   #19
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Default RE: help!! overheating

^^^^^you can't feel it rush through the hose only a temp change[&:]..make sure t-stat is in correctly and operational...if for some reason t-stat won't open = no flow occurs ..don't assume cause a part is new it works.....I have 10 + cases to prove such assumption wrong
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Old 03-30-2008, 09:17 PM   #20
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Default RE: help!! overheating

I would like to add my 2 cents as well.

Belt tension and condition is aitemto check but from the sounds you probably already checked.
I hate clutch fans,fan blade does not spin at the same rate as pully unlessthe by bi-metalexpands with heatbringing it toclose to 1 to 1. One way to "check" it although I don't know if it is accurate is see how freely you can spin it by hand after the engine has run hot. (ENGINE OFF OF COURSE)It should not spin veryeasy. May want to invest in a flex fan.

Other points, and I know I have done this before, are you sure you installed the tstat correctly?..... as in not backwards. If you are worried about flow and not seeing the swirl, pull the tstat out and bolt back up the housing with the tstat out, start the engine and look in therad. You will see flow now, hopefully......Witht he tstat out let it run for a while, past the 15 - 20min mark to seeif it is overheating.... if so the issue is somewhere else, if notreplace tstat. Also if the new tstat does not have a air hole already in it, drill one, it helps.
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Old 03-30-2008, 09:17 PM
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