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Old 08-10-2015, 03:34 PM   #1
officialdelano
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Wrench Wtf...running hot!

Okay guys, my 96 sl1 is running hot. The weird thing is that it only runs hot while I'm driving with the AC turned on. I pretty much changed the whole cooling system... water pump, radiator, and thermostat. I also changed the temperature sensor an AC condenser. I feel like I'm chasing a ghost....SOMEBODY HELP PLEASE

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Old 08-10-2015, 03:48 PM   #2
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Default Re: Wtf...running hot!

Describe HOT in detail, where exactly is the needle pointing? HOT is 3/4 or above.

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Old 08-10-2015, 03:57 PM   #3
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Question Re: Wtf...running hot!

Yup 3/4 and on into the red. Then I turn off the AC pull over and it goes right back to the middle. Now before I changed the AC condenser and the radiator it would jump to hot a lot faster. Now it takes a little while longer

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Old 08-10-2015, 04:06 PM   #4
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Default Re: Wtf...running hot!

Where are you located and who charged the A/C system? Are you driving in city stop and go traffic?

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Old 08-10-2015, 04:22 PM   #5
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Dizzy Re: Wtf...running hot!

Texas. Funny thing is when I'm idling it all goes back so stop and go traffic doesn't affect it as much as highway driving. Or at least it only has ran hot during highway driving. Once I put on the condenser I charge the AC system myself. Put a vacuum on it let it sit for a while, a while being 30 minutes to make sure I don't have any leaks. Then added the recommended amount of freon for my vehicle with a minimal amount of oil and a small amount of dye

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Old 08-10-2015, 04:49 PM   #6
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Default Re: Wtf...running hot!

The symptoms are an overcharge of gas or oil. The system is sensitive to both excess refrigerant and/or oil. The gas charge should have been 24 oz into the evacuated system. I would suspect it is too much oil.

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Old 08-10-2015, 05:07 PM   #7
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Question Re: Wtf...running hot!

What would be the reason behind that not being a symptom while the vehicle is idle?

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Old 08-10-2015, 05:18 PM   #8
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Default Re: Wtf...running hot!

Does your cooling fan run? With force or just turns? Prematurely wearing out in Texas heat may be your problem.

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Old 08-10-2015, 05:44 PM   #9
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Default Re: Wtf...running hot!

Yeah I forgot to mention I change the cooling fan 3 weeks ago. And it blows pretty hard no pun intended

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Old 08-10-2015, 05:45 PM   #10
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Default Re: Wtf...running hot!

Quote:
Originally Posted by officialdelano View Post
What would be the reason behind that not being a symptom while the vehicle is idle?
Lower compressor RPM and much lower A/C efficiency. If you are blowing ice at idle then oil is probably the issue. How much total volume did you add including the dye when you charged it up? Did you flush out the system before evacuating?

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Old 08-10-2015, 06:50 PM   #11
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Default Re: Wtf...running hot!

Any chance the fan is running backwards?

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Old 08-10-2015, 07:20 PM   #12
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Default Re: Wtf...running hot!

24 oz of freon and only 1 oz of oil. I'm pretty sure the fan is running correctly. Its blowing air into the engine pretty hard.

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Old 08-10-2015, 07:22 PM   #13
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Default Re: Wtf...running hot!

About the same amount of dye. Didn't flush just evac....

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Old 08-10-2015, 08:00 PM   #14
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Default Re: Wtf...running hot!

Fender liners and air dam in place?

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Old 08-10-2015, 08:11 PM   #15
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Default Re: Wtf...running hot!

Fender liners are in place. I'm not sure what the air dam is? Hey if the fan was turning backwards so to speak would it run hot at idle?

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Old 08-10-2015, 08:19 PM   #16
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Default Re: Wtf...running hot!

It may and maybe not. The only way to check air flow is to turn on a/c and check it with your hand.

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Old 08-10-2015, 08:28 PM   #17
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Default Re: Wtf...running hot!

Right now I have my AC on full blast in my vehicles are running about 20 minutes and it's still under midway on the temperature gauge.

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Old 08-10-2015, 08:35 PM   #18
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Default Re: Wtf...running hot!

Air dam May not be the correct term but the spring loaded "spoiler" on bottom front of car. Have seen in previous threads this should be in place for proper cooling.

Maybe a long shot but the condenser coil is not icing up during a highway run?

Last edited by guyg; 08-10-2015 at 08:47 PM..

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Old 08-10-2015, 08:47 PM   #19
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Default Re: Wtf...running hot!

The air dam is for low speed cooling on the gen-1 cars, does little to nothing for gen 2 and 3.

High speed overheat is not caused by not having the air dam.

Unless you rewired the fan it is turning the correct direction.

If you are running at 75 mph or greater the fan is shut off by the PCM as it serves no purpose.

If the A/C compressor is not unloading then the engine will probably overheat in Texas. It is either oil or compressor not unloading.

You can test unload by finding a nice place where you can drive at 45mph with the a/c off and then switch it on with blower on 5. You should feel the a/c load the engine and if you hold the throttle constant once cold air is issuing out the vent you will feel that a/c load drop way off. If it does not then it is not unloading

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Old 08-13-2015, 03:14 PM   #20
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Dizzy Re: Wtf...running hot!

Okay so my compressor is working I can feel it I unloading and my AC is getting cold. There was a plastic funnel looking piece right in front of the condenser which wasn't appropriately secured so I tighten it down. That did not solve my problem I'm still running hot only when I'm driving and my AC is on... Not while I'm.

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