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Old 08-16-2014, 06:30 PM   #1
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Over heating

I have a 91 5.0 and it seems like it runs too hot! I'm runnin no thermostat, a 3 row aluminum radiator with two electric fans , and my heater hoses aren't hooked up I've burped the system but it hasn't seemed to help and I can drive it for about 10 minutes before it gets to about 230 and all my hoses get rock hard when it start getting warm and after I kill it but the pressure eventually dissipates, any ideas?


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Old 08-16-2014, 08:58 PM   #2
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Get a thermostat

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Old 08-16-2014, 09:46 PM   #3
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What gauge are you using to get this number?
Lower and upper hoses get hard?
Yes you need a tstat 180 or a stock one.

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Old 08-16-2014, 09:48 PM   #4
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I have a manual and and electric and the both read the Same and both hoses get hard wouldn't a tstat make it get hotter faster then start circulating water when it gets to ex. 180


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Old 08-17-2014, 08:50 AM   #5
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Over heating

In a very simple explanation, (without getting into fluid mechanics or heat transfer); If the coolant is flowing through the engine too fast it actually will cause overheating problems. The thermostat controls the flow of coolant and allows the coolant to flow at a rate where the coolant has enough time to actually pull some heat out of the engine. If the coolant is flowing too fast it doesn't have enough time to actually heat up and remove heat as it passes through the cavities of the engine and out the radiator. Get a thermostat, nothing less than 180 or you will cause premature engine wear (another reason to get a thermostat).



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Old 08-17-2014, 11:55 AM   #6
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The coolant needs time to go thru the system and flow slowly thru the rad to cool off. Foxbox is correct. It needs the air to flow over the rad to cool the coolant.
Also how does your coolant look like?
What condition is it in?
What kinda fan are you using?
I have seen a leaky head gasket do the same thing also.

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Old 08-17-2014, 12:54 PM   #7
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Ok I understand thanks! And it's new coolant the engine is basically brand new since I rebuilt it I've only put about 20 miles on the car with this motor


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Old 08-19-2014, 10:29 AM   #8
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Now I have a 3 row aluminum radiator also and I have a 180 thermostat but my car never gets to 180 more like 160 is it because of the new rad?

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Old 08-19-2014, 11:03 AM   #9
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I put a thermostat in and I drove it around the block a couple times it only went to 210 and stayed there so that's good but I'm gonna drive it again either today or tomorrow to see if it will stay cool


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Old 08-19-2014, 02:20 PM   #10
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Make sure you burp the system well. Try raising the front end some and burp it that way also.
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Old 08-19-2014, 02:21 PM   #11
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Ok thanks!


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