327 Running Hot Please Help - Team Camaro Tech
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post #1 of 7 (permalink) Old May 28th, 07, 05:11 PM Thread Starter
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327 Running Hot Please Help

I am at a total loss. My 327 which has about 300 miles on it has started running hot. Well, 210 - 230 which to me is too hot. It used to run at 185 at the most. I changed thermostat to a high flow 160 degree, new coolant, new radiator, etc.. Do you think my discount auto water pump went out or something. Please help. Thanks guys.
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post #2 of 7 (permalink) Old May 28th, 07, 05:32 PM
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Re: 327 Running Hot Please Help

Are you sure you don't have an air pocket? Did you change the fan? I would pop the hose off the water inlet where the t-stat is and see if you put in on properly. While its out, fill the block with anti-freeze.

Test the t-stat in hot water to be sure it opens all the way. Put it back in and replace housing , hose , etc. Fill the system the rest of the way putting anti-freeze into the radiator .If that isn't the problem check that the fan is properly into the radiator shroud. About half in and half out is about right. See if any of this helped.

Kev
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post #3 of 7 (permalink) Old May 29th, 07, 03:05 AM
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Smile Re: 327 Running Hot Please Help

My 327 never runs hot. I put alotof of that to my stage 1 stewart water pump. Stewart water pumps are awesome ! I think I have seen summit is now carrying them, otherwise just order directly at

http://www.stewartcomponents.com/.

Please note: It won't cure the problem, if something else isn't right ! Make sure that your radiator cap is good !

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1
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post #4 of 7 (permalink) Old May 29th, 07, 10:13 AM
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Re: 327 Running Hot Please Help

Why would the radiator cap cause overheating?


-Funk



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post #5 of 7 (permalink) Old May 29th, 07, 10:29 AM
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Re: 327 Running Hot Please Help

A radiator cap won't cause overheating. Venting to too low a pressure can cause boiling, if the coolant temp is hot enough to boil at that pressure.

... has started to run hot?
As in for most of those 300 miles it did not run hot, but reecently it does?

Check your timing.
Check your fan clutch if you run one.
Open the radiator (when cold) warm the engine, and observe that coolant starts flowing at the temp of the thermostat.
Compare the temp of the upper and lower rad hoses, lower should be notibeably cooler.
Observe inside the radiator while you jack the throttle a few times (motor hot enough to open the thermostat) level should drop, then rise more, then stabilize where it started out. There should be minimal if any bubbles. Bubbles would indicate a problem, head gaskets maybe or worse.
Does your oil look milky at all?





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post #6 of 7 (permalink) Old May 29th, 07, 12:47 PM
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Tom
 
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Smile Re: 327 Running Hot Please Help

As Jim stated a bad radiator cap will not cause it to overheat, it will affect the temperature at which your coolant boils. For example : straight water boils at 212*. If you now have this system under pressure, it will boil at a higher temperature. This is why you hear nascar racer's say the water temp. is 240* and this is fine. They are probably running a 22 lb. cap.

69 Camaro -originally a LM1 car. 327, Edelbrock E-streets, hooker, DUI performance distributors, ultradyne cam, stewart, TRW etc. Vintage Air, AGR steering, Corbeau GTSII seats, 700R4 transmission, 12-bolt w/Eaton 4.11:1
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post #7 of 7 (permalink) Old May 29th, 07, 02:36 PM
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Re: 327 Running Hot Please Help

A bad radiator cap will cause over heating....
When the water biols, and it will in the block...it causes steam pockets, this causes cavitation in the pump and bad circulation...
Also loss of water .

My Spelling is not incorrect...it is creative

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