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APS car overheating

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Old Jun 11, 2008 | 04:31 PM
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Default APS car overheating

I have the APS twin kit on my car, along with a 403 cid LS2 engine and stock cooling system, I am using water and water wetter in the cooling system, I was using the Dex-Cool with water wetter and in hot weather I can't run the A/C or the car will overheat quickly. I am open for ideas and suggestions. Thanks

Last edited by Darren P; Jun 12, 2008 at 05:50 PM.
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Old Jun 11, 2008 | 04:47 PM
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LT1 F-Body radiator is about 1/3 more cooling capacity, but you are probably generating enough heat to go with an aftermarket large tube radiator.
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Old Jun 11, 2008 | 05:11 PM
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Can you run the A/C while you are cruising on the highway at cruise speeds and stay cool?

Does it only happen during city driving?
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Old Jun 11, 2008 | 05:56 PM
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have you tried to bleed the system again? possibly an air bubble thats just getting amplified when more demand is put on the cooling system?
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Old Jun 11, 2008 | 06:02 PM
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I went with a Evans coolant & water pump which should have been enough!! but i went the extra mile with the Be Cool racing rad and fan kit!! I didnt think the stock cooling was enough even before i started my build !!at least check into a pump and coolant first!!
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Old Jun 11, 2008 | 06:04 PM
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barnat you got pics of the rad and fan kit, and price you paid
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Old Jun 11, 2008 | 06:17 PM
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Might have to go with a different radiator. Might want to try running pure water in the summer time it has way better heat transfer than dexcool.
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Old Jun 11, 2008 | 06:24 PM
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Be Cool or Griffin are excellent aftermarket radiators and dissipate heat better than the stockers.....
What thermostat are you running? Did you check it? It could be stuck.
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Old Jun 11, 2008 | 06:30 PM
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Do you have an underdrive pulley? May not be enough water flow at idle/low rpm. For a test try holding rpm at 1200 instead of idle and see if the temps start to drop.
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Old Jun 11, 2008 | 07:02 PM
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I assume 160 stat and set your fans to come on at much lower than stock settings or on anytime you ignition is on might help. Make sure nothing is up there like a grocery bag. I got one up there once and couldn't figure why car would overheat.Just a stupid grocery bag.
You might need a better rad just wondering which ones will fit like stock with the aps kit. Are the griffins or whatever exact same size as stock or are they thicker and if so is this a problem.
One temp trick is to turn the heater on it can save a boilover. And stuck thermostat definitely can cause problems.
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Old Jun 11, 2008 | 07:35 PM
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The Ron Davis radiators are some of the best, we have had great success with them.
http://www.exoticperformanceplus.com...html?item=1228 Bob
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Old Jun 11, 2008 | 08:01 PM
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Another thing is to verify ignition timing, but I am sure you are ok there with a computer controlled car......
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Old Jun 11, 2008 | 08:09 PM
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Switch to STS Turbo system.
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Old Jun 11, 2008 | 08:16 PM
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Originally Posted by sslateron
Switch to STS Turbo system.
Don't say that, I just bought the APS kit!!!
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Old Jun 11, 2008 | 08:52 PM
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Originally Posted by Exotic Performance Plus
The Ron Davis radiators are some of the best, we have had great success with them.
http://www.exoticperformanceplus.com...html?item=1228 Bob
and for the same price you can get a nice turbo or hot parts setup
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Old Jun 11, 2008 | 09:27 PM
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I was leaning this way hard, sitting back following along....... I think I ran across a couple threads about running warm in the past with A/C. One reason I didn't pull the trigger.
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Old Jun 11, 2008 | 09:37 PM
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Originally Posted by INTMD8
Do you have an underdrive pulley? May not be enough water flow at idle/low rpm. For a test try holding rpm at 1200 instead of idle and see if the temps start to drop.

I do have a underdrive pully but it runs hot on the highway and setting still.
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Old Jun 11, 2008 | 09:40 PM
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Originally Posted by ls2 bait
have you tried to bleed the system again? possibly an air bubble thats just getting amplified when more demand is put on the cooling system?
I ran all the air out of it. I have added a little water to top it off but it is full. Is there another way to bleed it other than filling it up and bringing it to operating temp and addding water till it is full?
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Old Jun 11, 2008 | 09:42 PM
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Originally Posted by needadvice
Can you run the A/C while you are cruising on the highway at cruise speeds and stay cool?

Does it only happen during city driving?

I can't run the A/C at all highway or setting still. With the heat on wide open on Saturday (98*day) it would stay between 205 and 212 turn the heat off and it went to 220 with the AC, forget it.
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Old Jun 11, 2008 | 09:43 PM
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Originally Posted by MY99TAWS6
I assume 160 stat and set your fans to come on at much lower than stock settings or on anytime you ignition is on might help. Make sure nothing is up there like a grocery bag. I got one up there once and couldn't figure why car would overheat.Just a stupid grocery bag.
You might need a better rad just wondering which ones will fit like stock with the aps kit. Are the griffins or whatever exact same size as stock or are they thicker and if so is this a problem.
One temp trick is to turn the heater on it can save a boilover. And stuck thermostat definitely can cause problems.

160 T-stat and fans come on at 165. There is not anything blocking the airflow other than the intercooler.
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