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post #1 of 5 (permalink) Old 06-25-2007, 06:43 PM Thread Starter
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Cooling system question

Today my temp gauge hit an all time high of almost 3/4 on the needle. I had the AC on full blast as well. The temp stays at about 1/4 for the first 20 minutes of driving and will start going up as I put a heavy load on it or as above, it's hot out (alsmost 100) and the AC is cranking and putting the throttle down - alot (rush hour - everyones in MY way!)

I am not sure if it's the pump or the radiator.

New heads
Little loss of fluid
New hoses
New T-stat - 192
New belt
Fan comes on when the temp is at 1/2 - everytime and when the AC is on, the fan is on full time. So the fan is working, t-stat is good, correct mixture of fluid.

What else could it be? My bet is to replace the water pump @ $50 and then the rad at $$$ if it needs it. Rad is about 10 years old and the engine has 120k.

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post #2 of 5 (permalink) Old 06-25-2007, 09:16 PM
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I suspect the radiator to be the problem. If the water pump isn't leaking or making noise and the shaft doesn't have any play, it should be good.


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post #3 of 5 (permalink) Old 06-25-2007, 09:22 PM
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Why don't you do a pressure check???I just recently found a very slow leak in my system that has been there since I did the PI swap.(2 years now).It only leaked when under pressure.

04 PI swap,SVO Supercharger 8-9 psi,Alcohol injection,39lbs Cobra injectors,XCal2-Walbro 255 LPH fuel pump,4.10 T-Lok,2003 4R70W built to withstand by RobertP,450hp JMOD,3800 circleD stall,trucool 4739 Trans Cooler,Dynotech 3.5 Driveshaft,70mm T/B,SCP Cold Air Intake,90mm LMAF,JBA headers,Magnaflow Midmount,No cats with 3inch piping,Vogtland 1.6inch drop,Cobra R's and xenon body kit.

Its slow, Really.
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post #4 of 5 (permalink) Old 06-26-2007, 03:12 AM
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Might look into what was happening with my car.

Mine was doing the same, the gauge was dancing and would climb whenever my subwoofer hit and would "overheat", and I replaced the brass sensor that actually goes to the gauge (it was like $5.00) and I havent had a problem since with it climbing ever since.

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post #5 of 5 (permalink) Old 06-26-2007, 12:19 PM Thread Starter
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Thanks guys. My neighbor has a pressure testing unit and I will do that first. After that, a better gauge!
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