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  #1 (permalink)  
Old 07-10-2008, 05:01 PM
2000jack's Avatar
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Simple Radiator Question for a simple person

Car overheats when I drive down the road and I have replaced or it is new everything. Now I am trying anything. When I placed a handkerchief in front of my radiator at idle the handkerchief flew/waved at me at almost a 90 degree angle. The air is coming from the engine side pushed by the fan through the radiator towards me as I am standing in front of the car. I thinking, shouldn't the handkerchief be sucked up to the radiator face when hold it in front? Or am I wrong in my thinking? As you can see we are not talking any hi-tech job. Just a plain jane 305ho, although there is not much "ho" in a 305ho.
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  #2 (permalink)  
Old 07-10-2008, 05:07 PM
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Did you change the fan from what was on the 305 before? Sounds like the wrong pitch on the fan blades...
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  #3 (permalink)  
Old 07-10-2008, 05:18 PM
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Quote:
Originally Posted by sbchevfreak
Did you change the fan from what was on the 305 before? Sounds like the wrong pitch on the fan blades...
The motor was in my '29 and I just had the block, so I bought a fan new in the box at a flea market, low dollar car.
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Old 07-10-2008, 05:54 PM
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Quote:
Originally Posted by 2000jack
Car overheats when I drive down the road and I have replaced or it is new everything. Now I am trying anything. When I placed a handkerchief in front of my radiator at idle the handkerchief flew/waved at me at almost a 90 degree angle. The air is coming from the engine side pushed by the fan through the radiator towards me as I am standing in front of the car. I thinking, shouldn't the handkerchief be sucked up to the radiator face when hold it in front? Or am I wrong in my thinking? As you can see we are not talking any hi-tech job. Just a plain jane 305ho, although there is not much "ho" in a 305ho.
If this is a pump mounted fan and you replaced the pump as well one of several things happened.

To start with V-Belt pumps and fans rotate clockwise, same as the crank. Serpentine belt pumps and fans rotate opposite to V-belts and the crank in a counter-clockwise direction.

If you have cross breded the pump or fan between these they will be turning opposite to the direction needed for the belt system.

The pump will attempt to pull coolant from the engine, so intake will be from the top of the radiator and return thru the bottom.

The fan will blow air out the front of the radiator instead of pulling it in.

Bogie
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Old 07-10-2008, 07:15 PM
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what oldbogie said, or if the V belts are going clockwise, it maybe as simple as the fan may be on back wards.
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Old 07-10-2008, 07:32 PM
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The fan being on backwards would still move the air the same direction, just not as effeciently. Sounds to me like the fan is pitched backward from the proper rotation.
Can you post a close up picture of the engine fan?
JA
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Old 07-10-2008, 08:20 PM
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Simple Radiator Question for a simple person

get a pre 87 chevy fan
you got a nice ride
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Old 07-10-2008, 09:15 PM
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Quote:
Originally Posted by Mustangsaly
what oldbogie said, or if the V belts are going clockwise, it maybe as simple as the fan may be on back wards.
I did think of that but it didn't look as if you could turn the fan around and function.
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Old 07-10-2008, 09:18 PM
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Quote:
Originally Posted by johnnya
The fan being on backwards would still move the air the same direction, just not as effeciently. Sounds to me like the fan is pitched backward from the proper rotation.
Can you post a close up picture of the engine fan?
JA
I was looking in Summit and that have photos of fans for reverse directions. I was going to check the fan against that. Also I will probably take it off and check for a part number and see if it has one and double check the application. If you go this web site you will see a picture of the engine, not the best photo though, but it shows the fan. http://www.hotrodhotline.com/feature...oodmansee0422/

Last edited by 2000jack; 07-10-2008 at 09:32 PM.
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  #10 (permalink)  
Old 07-10-2008, 09:28 PM
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Quote:
Originally Posted by burnt olds
get a pre 87 chevy fan
you got a nice ride
Now that I got an idea of what to look at, hopefully I will get a better handle on the problem. Thanks for the compliment. I have a "29 and I partially (wip) did it over and had of left over parts. So I started this one with a '31frame and a '27 Tudor sedan body.
More photos http://www.hotrodhotline.com/feature...oodmansee0422/
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Old 07-10-2008, 11:42 PM
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Quote:
Originally Posted by 2000jack
I was looking in Summit and that have photos of fans for reverse directions. I was going to check the fan against that. Also I will probably take it off and check for a part number and see if it has one and double check the application. If you go this web site you will see a picture of the engine, not the best photo though, but it shows the fan. http://www.hotrodhotline.com/feature...oodmansee0422/
That fan is definetly for reverse rotation.
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  #12 (permalink)  
Old 07-11-2008, 02:25 AM
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Quote:
Originally Posted by SSedan64
That fan is definetly for reverse rotation.
First thanks for your help! When I bought the fan, I never gave it any thought. I guess it is because when I was first into hot rods in the 60's and early 70's with my 23 T, before Total Performance open it's doors, a 36 Dodge coupe and a 33 sedan (although I did buy a Pete and Jake's front axle, that was a "wow" then) there was just about only JC Whitney catalog's to get stuff from. A lot of Chevy stuff was interchangeable, if it fits it works. In the 70's I was into muscle cars, 65 GTO, that had an Isky 310 duration cam, the old way of measuring, a stock tri-power 66 GTO, 66 Nova, 55 Chevy and a 68 Corvette Convertible. Then I opened a business that I had for 20 years and I changed gears and now I changed gears again into the hot rod mode. I have a lot of catching up to do
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Old 07-11-2008, 12:21 PM
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Sur loks to be wrong fan for aplication, Unless your were to go to serpentine belt system. Also a benefit if you have a lot of accessories to releve stress off the crank nose.

Last edited by n-gin; 07-11-2008 at 12:30 PM.
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  #14 (permalink)  
Old 07-11-2008, 12:47 PM
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Quote:
Originally Posted by n-gin
Sur loks to be wrong fan for aplication, Unless your were to go to serpentine belt system. Also a benefit if you have a lot of accessories to releve stress off the crank nose.
I want and bought the correct one and I am going to install it tonight. I checked the number on the one one in Summit catalog and sure enough it was for a serpentine belt. I drove it for twenty minutes and it never went over 190, before it would be 6/7 minutes and it would be at 220/230.

Last edited by 2000jack; 07-12-2008 at 04:00 AM.
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