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Heating & Cooling Heating, cooling and air conditioning

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  #1  
Old Feb 5th, 08, 6:12 PM
curley8788 curley8788 is offline
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Default upper hose hot, lower hose cold

my upper radiator hose gets hot and is pressurized once my thermostat opens. the drivers side of the radiator is also warm/hot. when i feel the lower radiator hose, it is cold but its somewhat pressurized. the passenger side of the radiator is cold too.

i am thinking it is clogged? i dont know how, because it was working fine a few days ago. now all of the sudden my engine heats up to 215 degrees and i have a 180 thermostat. i dont like that at all.

any thoughts? i am planning on flushing the radiator to see what happens.
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  #2  
Old Feb 5th, 08, 6:18 PM
curley8788 curley8788 is offline
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Default Re: upper hose hot, lower hose cold

oh and my heater hoses are hot and the heater works fine too.
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  #3  
Old Feb 5th, 08, 6:24 PM
furball8994 furball8994 is offline
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Default Re: upper hose hot, lower hose cold

So you are saying that the inlet side of your Radiator is hot and the outlet side of your Radiator is cold. Isn't that the way its supposed to work?


On a more serious note. Remove your Rad. cap. Run your engine until the stat opens and see if you have good cross flow.

Did you change anything in your cooling system. You may have an air pocket.

Where is your temp. gauge mounted? If its in the head, It will read hotter than in the intake.
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  #4  
Old Feb 5th, 08, 8:28 PM
novaderrik novaderrik is offline
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Default Re: upper hose hot, lower hose cold

215 aint nothing- as long as you have a good pressure cap, it won't boil over until about 230.
thats assuming, of course, that your gauge is accurate. if it doesn't boil over and run like crap, won't worry about it.
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  #5  
Old Feb 5th, 08, 9:28 PM
curley8788 curley8788 is offline
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Default Re: upper hose hot, lower hose cold

yeah the gauge is in the intake manifold. also, i did have to take off the power steering pump and i have custom brackets so the bolts go into the water pump. it caused it to leak like crazy so i refilled it after i was done...

i will burp the system tonight and let you know if i see the coolant moving...

it normally runs at 185-190... i dont get it.
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  #6  
Old Feb 6th, 08, 3:36 PM
curley8788 curley8788 is offline
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Default Re: upper hose hot, lower hose cold

bump
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  #7  
Old Feb 6th, 08, 5:31 PM
curley8788 curley8788 is offline
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Default Re: upper hose hot, lower hose cold

when i squeeze the lower radiator hose, the coolant rises. like i said though, no heat from the lower hose though. i get heat on the drivers side of the radiator and it gets colder as i go down and towards the passenger's side... i realize that that is what's supposed to happen, but im running 30 degrees above normal now...

any help is greatly appreciated... i will continue to search for people with similar problems.
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  #8  
Old Feb 6th, 08, 8:51 PM
onovakind67 onovakind67 is offline
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Default Re: upper hose hot, lower hose cold

Sounds like you have a low flow problem. In order to cool the engine the radiator must achieve a certain average temperature in order to dissipate the heat. If you slow the flow so the outlet temperature drops, the inlet temperature will have to be raised to maintain the same heat rejection.
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  #9  
Old Feb 6th, 08, 10:12 PM
curley8788 curley8788 is offline
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Default Re: upper hose hot, lower hose cold

Quote:
Originally Posted by onovakind67 View Post
Sounds like you have a low flow problem. In order to cool the engine the radiator must achieve a certain average temperature in order to dissipate the heat. If you slow the flow so the outlet temperature drops, the inlet temperature will have to be raised to maintain the same heat rejection.
so what the heck am i supposed to do? i really doubt that because everything was working perfect, and then i replaced my loose belts with tighter ones and now it has this problem. im going to run it with no thermostat and see what i get... i will keep you all updated...
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Old Feb 6th, 08, 11:32 PM
aukai aukai is offline
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Default Re: upper hose hot, lower hose cold

I had a cooling problem once and it drove me crazy it turned out to be the stamped steel impeller sheared off of the shaft it cooled by thermal circulation till I found it.
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  #11  
Old Feb 6th, 08, 11:56 PM
curley8788 curley8788 is offline
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Default Re: upper hose hot, lower hose cold

guess what? it was just a thermostat stuck in the half way open position! im going to buy a new one tomorrow...
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  #12  
Old Feb 7th, 08, 1:39 AM
aukai aukai is offline
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Default Re: upper hose hot, lower hose cold

On the road again
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  #13  
Old Feb 7th, 08, 8:10 PM
curley8788 curley8788 is offline
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Default Re: upper hose hot, lower hose cold

update:

put a new stant thermostat in. refilled and burped the coolant... took the car out for a drive and it was overheating even worse... 230-235 degrees after driving for a few blocks. so i hurried home and shut it down. now the upper radiator hose feels cold!

tomorrow im going to run without a thermostat and see what happens. what a pain it the a** this is turning out to be!
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  #14  
Old Feb 7th, 08, 8:29 PM
Chevl_Steve Chevl_Steve is offline
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Default Re: upper hose hot, lower hose cold

Take the thermostat back out, put it in a pan of water on the stove. Put in a thermometer and watch as the heat goes up. Verify the temp it opens.

Some guys drill a small hole in the thermostat to help burp air bubbles. I'm not sure if that works or not.

Did the timing change recently? You said something about tighter belts?

What kind of fan are you using on the radiator?
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  #15  
Old Feb 7th, 08, 8:38 PM
curley8788 curley8788 is offline
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Default Re: upper hose hot, lower hose cold

Quote:
Originally Posted by Chevl_Steve View Post
Take the thermostat back out, put it in a pan of water on the stove. Put in a thermometer and watch as the heat goes up. Verify the temp it opens.

Some guys drill a small hole in the thermostat to help burp air bubbles. I'm not sure if that works or not.

Did the timing change recently? You said something about tighter belts?

What kind of fan are you using on the radiator?
yeah i test pretty much every thermostat i get sooner or later...this new one is going to be tested tomorrow.

drilling the little hole is unnecessary, so im not going to do that.

actually the timing did not change, i just set it weeks ago.

yes i did change my power steering belt and my alternator belt because they were WAYYY too loose.

i am using a 17 or 18 inch flex fan inside of the stock radiator shroud. it cooled fine a week or so ago... i think it may be clogged with some leaf bits or something because when i took the "old" thermostat out, it had pieces of leaves stuck in it.

running the car with no thermostat will ultimately tell me what's going on...
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