Air Conditioning and Overheating
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Junior Member
Joined: Apr 2003
Posts: 46
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From: Colorado
Car: 2001 VW Passat
Engine: 1.8 Turbo
Transmission: Automatic 5 speed with Tiptronic
Axle/Gears: Stock
Air Conditioning and Overheating
It seems everytime I run my A/C the car temp will rise very quickly. It hasn't gone into the 260 degree area, but it has been damn close. I have a new thermatically controlled fan clutch, the shrouds are in perfect condition, and i installed dual electric fans on the outside of the condenser. I tried them both ways, pushing and pulling, and the car still rises wayyyy above normal operating temperature. I have a 160° thermostat and its always running at that...except when the a/c is on. any ideas? please help!!!
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Joined: Jul 2003
Posts: 4,079
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From: Houston Texas
Car: 1989 IROC Z-28
Engine: L98 350--modified
Transmission: 700 R4--modified
Axle/Gears: 4:10 Posi
Need more info...Does it heat up when on the highway doing 60/70? or just when crusing around town at slow speeds. It's normal for it to go up some with AC on, but not as much as U describe. Did the heating problem start when U installed the thermo fan clutch. (I never liked that type fan clutch anyway). Me personally, I always preferred a solid flex fan--good slow air flow--and flexed to not rob as much power under higher RPM. Maybe some readers who have had more experiance with this type of fan clutch will respond!
Thread Starter
Junior Member
Joined: Apr 2003
Posts: 46
Likes: 0
From: Colorado
Car: 2001 VW Passat
Engine: 1.8 Turbo
Transmission: Automatic 5 speed with Tiptronic
Axle/Gears: Stock
On the highway it does drop down below the 220 mark, but once i slow down in the city, it just climbs right over that 220 mark. it usually is below the 190 mark....real low. It seemed to overheat after i got that clutch. Should i just take that off and replace it with a flex-a-lite fan? And if so, what is the purpose of having the clutch fan?
Not too familiar with clutch fans, but the fan should be constantly on when the A/C is on. If the fans are mounted in front of the coil, they should be pushing, not pulling.
Other than that, I don't really know what would cause it to overheat. 220 isn't all that bad anyway.
Other than that, I don't really know what would cause it to overheat. 220 isn't all that bad anyway.
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Joined: Jul 2003
Posts: 4,079
Likes: 1
From: Houston Texas
Car: 1989 IROC Z-28
Engine: L98 350--modified
Transmission: 700 R4--modified
Axle/Gears: 4:10 Posi
The thermal clutch fan is one of several methods to reduce the drag from the cooling fan that can rob mucho power from your engine. I've always liked the clutch fan, since it draws max air flow at low speeds--blades flex and straighten out under higher rpm's so it does not rob horsepower. A few have been known to explode, but usually in extreme circumstances, or deglect in care/maintence. Then again I've heard stories about every kind of fan, mechanical or electric, exploding, so don't let it scare U off. I personally have not, or actually know anybody, that has had a fan explode, regardless of what kind.
Thread Starter
Junior Member
Joined: Apr 2003
Posts: 46
Likes: 0
From: Colorado
Car: 2001 VW Passat
Engine: 1.8 Turbo
Transmission: Automatic 5 speed with Tiptronic
Axle/Gears: Stock
I know that 220 isnt that bad, but when it starts to go over 220,thats when i worry. The dual fans on the outside of the coil are pushing in towards the clutch fan. This morning after coming home from a fiends house, I popped the hood and ran my hand down the radiator. It seems that that is my problem. It was really warm in some places, but cool in other places, which means that my radiator is clogged and i need to have it cleaned. Also, should I just stick with my thermo clutch fan? Thanks
Moderator
Joined: Jul 2003
Posts: 4,079
Likes: 1
From: Houston Texas
Car: 1989 IROC Z-28
Engine: L98 350--modified
Transmission: 700 R4--modified
Axle/Gears: 4:10 Posi
Depends on where it's hot and where it's cooler. It should be hotter on the inlet side and cooler on the output side. If U are gonna do the rad, wait to make a decision about the fan clutch. I still prefer the flex fan in ALL street/ strip applications but not roundy round racing or road course (maybe some road racing situations--weekend parking lot rallys--yes) Actually I prefer electric fans the most, but in your situation unless U just like spending money, I would go with a flex fan for the best cooling!
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Joined: Jul 1999
Posts: 997
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From: Katy, TX
Car: 1985 IROC Z-28
Engine: 355
Transmission: TH-350
Axle/Gears: 3:73
If you have a brass and copper radiator, tou may need to upgrade to aluminum, which will dissipate the condenser heat better than the rad. that you have.
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