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A/C Issues

 
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Old 05-19-2009, 11:40 AM
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A/C Issues

Alright here are my symptoms, My car overheats when I'm in stop and go traffic, the rpm's rise and fall after accelerating 3-5 times almost every time, they fluctuate between 1000 and to under 500 rpm's, almost stalling. Also, I pretty much get no cold air unless I'm moving at 20mph or faster.

I have a Fluidyne radiator and when I got it I never used my A/C so I took the A/C Fan off. Later when I went to put it back on and it turns out my parents threw it away. I ended up getting another Fluidyne fan to replace it but it doesn't spin as fast as the "radiator" fan.

Other then the rpm fluctuations I'm pretty sure my problem is the slow rotating A/C fan, is there any way to speed it up? I know it can move faster then it does I just need the car to tell it to. Could I possibly need a new thermostat?
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Old 05-21-2009, 03:16 PM
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Re: A/C Issues

Awww man, nothing? I really need to get this taken care of. It was 90 degrees the other day.
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Old 05-28-2009, 12:55 PM
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Re: A/C Issues

Please...
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Old 05-28-2009, 01:46 PM
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Re: A/C Issues

The main fan is spinning 4-8 times faster than the A/C fan.
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Old 06-02-2009, 11:48 PM
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Re: A/C Issues

Come on guys, this problem isn't going away on its own. Is the only thing to do, is to get the stock fan?
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Old 06-19-2009, 06:31 PM
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Re: A/C Issues

I do have AEM Underdrive Pulleys as well, would that be part of the overheating issues?
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Old 06-19-2009, 08:43 PM
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Re: A/C Issues

doubt it. have you charged your A/C recently? do you know how to check it? our cars are getting old, the A/C systems just don't have the same efficiency that they did when they were new. could be your fan. i'd get a stock fan.

as for your overheating problem. i'm not to keen on those. but check your coolant level for one. have you flushed the coolant system? might want to do that. for the time being until you do figure out what it is, keeping your A/C on should help, if not turn your heat on if it starts to get to high. yeah it sucks, but its better then having a blown engine from it overheating to much.
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Old 06-21-2009, 02:21 PM
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Re: A/C Issues

Doesn't the water pump flow less at idle due to the underdrive? If the A/C needed charging wouldn't it not work at high speeds as well?
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Old 06-21-2009, 06:22 PM
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Re: A/C Issues

yes the A/C will ALWAYS work better of course at higher engine speeds. but regardless, in stop and go traffic, the engine speeds aren't high enough for long enough to keep it cool. and yes, the water pump does flow less at idle. but that doesn't change anything. the biggest contributor to cooling, or lack there of, is flow restriction and amt of air passing through the radiator. at idle there is little to no air passing through the radiator to cool the coolant. thats why turning the heat on helps. it cools the coolant passing through the heater core.
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Quote:
Originally Posted by Si Speed
Drew can be a bigger asshole than me, and tell them in 16353 ways that they're a moron for wasting his time, and still not answer them.
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I am not helping you any more. you're a prick
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Old 06-21-2009, 06:26 PM
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Re: A/C Issues

I meant, the water pump flows less water at idle with the underdrive pulley as opposed to the stock pulley. Also, the A/C works fine until I do a lot of stop and go and it's very hot.
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Old 06-29-2009, 12:25 AM
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Re: A/C Issues

Can anyone confirm or deny about the rate of flow with the underdrive vs. stock diameter pulley?
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Old 06-21-2010, 06:42 PM
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Re: A/C Issues

So, it's getting hot out again and I am having the same problem. I ended up going back to stock diameter pulleys but all my symptoms are the same. I do not have a heat shield on my header how much could that be contributing to my problem?
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Old 06-21-2010, 08:44 PM
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Re: A/C Issues

the heat shield should have no effect. my a/c is colder then ever and i haven't had a heat shield for the past 2-3 years

consistent speed is gonna keep your a/c cooler then stop and go. simply because your compressor is compressing more and your condenser (the a/c radiator) is getting more air flow through it to help cool the freon. i see a noticeable difference in mine between stop and go and consistent speed. does your a/c fan run when you sit still for extended periods of time? i would check your a/c condenser (situated in front of your radiator) the coils and fins. make sure there isn't any excessive obstructions like bugs. might be wise to clean them out. or make sure the fins aren't excessively bent. the more bent or the more obstructions they get the less efficient your a/c will become. if half the condenser is covered in bugs, clean them out. you'll notice a difference. i'd say about 10% of mine is covered by bugs and i don't notice a difference.
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Quote:
Originally Posted by Si Speed
Drew can be a bigger asshole than me, and tell them in 16353 ways that they're a moron for wasting his time, and still not answer them.
Quote:
Originally Posted by ogsmakdade
I am not helping you any more. you're a prick

Last edited by Beaker; 06-21-2010 at 08:49 PM.
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Old 06-21-2010, 09:03 PM
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Re: A/C Issues

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Originally Posted by Beaker View Post
the heat shield should have no effect. my a/c is colder then ever and i haven't had a heat shield for the past 2-3 years

consistent speed is gonna keep your a/c cooler then stop and go. simply because your compressor is compressing more and your condenser (the a/c radiator) is getting more air flow through it to help cool the freon. does your a/c fan run when you sit still for extended periods of time? i would check your a/c condenser (situated in front of your radiator) the coils and fins. make sure there isn't any excessive obstructions like bugs. might be wise to clean them out. or make sure the fins aren't excessively bent. the more bent or the more obstructions they get the less efficient your a/c will become. if half the condenser is covered in bugs, clean them out. you'll notice a difference. i'd say about 10% of mine is covered by bugs and i don't notice a difference.
When I say that it over heats I mean if I don't turn off the A/C the needle will get to the top of the gauge and then my car will probably blow up.

The condenser fins are all (mostly) fine and clean.

I checked my fuses and they're are both fine. I took out the radiator fuse and the condenser fan ran at the same (slow) speed. The only other thing I can think of is to check the voltage to the fan.

I did however think of another theory. When I say the fan is running slowly, I mean the amount of air flow. I suppose it is possible that the fins on the side of the radiator and condenser that I can't see (they're blocking each other), could have bent fins which would prevent the flow of air. I highly doubt it though.

Also, I had my radiator flushed in the past 6 months.
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Old 03-07-2011, 08:59 PM
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Re: A/C Issues

Since spring is coming I was reminded of this inevitable issue that I still haven't fixed.

I have a few ideas that might help. Could I apply a ceramic coating to the header, to keep under hood temps down? Would it help to insulate my A/C systems tubing? Could it be my thermostat, I have one sitting around and I have 97k miles on my car.
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Old 03-13-2011, 12:21 PM
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Re: A/C Issues

Changing thermostat wouldn't hurt. You can get a cooler temp thermostat. Try adding redline Water Wetter to the coolant. It is about $10 at any auto parts store. It changes the surface tension in the coolant and helps a lot (my truck runs almost 10 degrees cooler while towing my boat than without the additive in it). Clean the front of the radiator/condensor and make sure there are no bugs/ bent fins. Check voltage to the cooling fans.

No the underdrive pulleys will not make the water pump spin slower. The water pump is driven off the timing belt, inside the timing cover. The pulley will not affect the speed at which the water pump spins.

Yes, the heat shield missing will affect heat under hood. it is designed to insulate the radiator/fans from the heat of the header. When driving there is enough airflow to keep it cooled. When in stop and go driving there isn't enough airflow to stop the heat from radiating forward to the radiator. Try either reinstalling the heat shield, or getting header wrap and wrapping/coating the header. Ceramic coat will help, but not as much as the insulating wraps they make.


Good luck and let us know.
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Old 03-14-2011, 08:16 PM
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Re: A/C Issues

When I originally had the issue I had red line in but the radiator needed to be flushed, I'll get some more. I still need to check the voltage of the driver side fan.

There are not mounting points on the "new" header for the heat shield. Can I do the ceramic coating and wrap together? I've heard wrapping can cause the welds to crack, so just keep it away from them? Recommend any particular wrap/coating?
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Old 07-04-2011, 12:44 AM
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Re: A/C Issues

I finally got my A/C fixed. The A/C fan was running in reverse so it was sucking the hot air from the engine bay and blowing it through the radiator and condenser. I can't believe those guys wired it wrong.
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Old 07-04-2011, 05:33 PM
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Re: A/C Issues

I bet that helps your engine temps too, lol. Sorry such a hassle, great easy fix though!
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