quick overheat

[67 coronet]

that fan by itself is not enough flow.when i replace the mechanical fan on my cars,i use a dual fan setup that goes all the way across the radiator.pulls over 3800 cfm,and keeps the car at about 190 ish at idle in 100 degree plus heat.your fan is not pulling enough air over the radiator.

 

[ChgrSteve67]

My money is on a air flow problem.
-Steve

that fan by itself is not enough flow.when i replace the mechanical fan on my cars,i use a dual fan setup that goes all the way across the radiator.pulls over 3800 cfm,and keeps the car at about 190 ish at idle in 100 degree plus heat.your fan is not pulling enough air over the radiator.

Yep

There are fan setups that are around 3000+/- cfm that will work but the key will be a shroud that covers the radiator so air is pulled through the entire radiator.

 

[WileE]

What the previous posters say are correct. I personally don't like that rad/fan setup. Is the inlet diameter "smaller" than the hose ? Am I seeing that correctly ? That's a flow constrictor, right there. If so, I'd ditch that rad ASAP. Get the correct size. Either a factory clutch fan/shroud, or larger electric that covers/shrouds the entire radiator, that little one isn't doing diddly-squat.

 

[biginch=bigfun]

WileERobby,
The inlet is the same diam. as the hose.

Thank you all for the advise. I will try changeing back to the clutch fan & building a shroud.

THANK YOU

 

[rolling_Thunder]

Dumb question - Did you wire up the fan correctly to pull air through the radiator? I had a car come into the shop on a hook because of overheating... turns out the guy installed an electric fan and reversed the wiring so it was pushing hot engine bay air through the radiator...

 

[biginch=bigfun]

LOL, yes it is wired to pull air through the radiator. I just removed the electric fan & reinstalled the clutch fan. Now i need to make a shroud for it.
Thanks for the idea, though!

 

[Revhendo]

Dumb question - Did you wire up the fan correctly to pull air through the radiator? I had a car come into the shop on a hook because of overheating... turns out the guy installed an electric fan and reversed the wiring so it was pushing hot engine bay air through the radiator...

You have to pay attention to the pitch on the fan blades, also. I've had cars come in with the fans turning in right rotation but the fan blade angle is still for the opposite direction. (Think of how you cup your hand when you swim).

 

[Revhendo]

Also, don't try to get too hung up on CFM ratings on fan's. You would be suprised at what a radiator really needs for airflow.

 

[biginch=bigfun]

I can see everyone's point about the electric fan, except I've been running a 24" blower fan in front of the car to add to the air flow...

The electric fan seems to be moving alot of air if you hold a hand behind it. But I am going to try the clutch fan again to see if it does a better job.

 

[tpodwdog]

read this,,,,might help ya!

http://www.forbbodiesonly.com/moparforum/showthread.php?t=35471&highlight=crazy+cooling+issue

 

[HEMI-ITIS]

This is what I use without a mechanical fan becausr there is no room for it.A pair of electric fans that were wired for pushing:icon_viking:

 

[HEMI-ITIS]

NO,NO,NO!!!That my new air conditioner,these are my electric fans:blob1:

 

[terzmo]

if the car runs hot at idle...it's most likely not drawing enough air through the rad....are the fans sucking or blowing ? start the fans and put plastic in front of the rad...that will tell....is the thermostat opening,,,,I would assume so as you see circulation. Lower hose would collapse at highway speeds..not idle...

I ran a 7 blade steel fan with clutch on a 2 row champion alum rad with shroud and it cooled My 498 stroker very nice.

 

[Revhendo]

NO,NO,NO!!!That my new air conditioner,these are my electric fans:blob1:

your blades are facing the wrong way.

 

[67 coronet]

normally a blower fan from outside the car gives a lot of air volume,but not enough velocity to cool the car.it is about the equivitent of driving at 5-10 mph,not enough to cool the car.hope the mechanical fan solves the problem.if not,see if you can hook up the 16 inch fan as a pusher.that is a common setup here in the desert.

 

[HEMI-ITIS]

your blades are facing the wrong way.

Reversed the polarity when I 1st aquired the set.Keeps my heap under 200* and 180* on the expressway at 65 MPH:toothy6:

 

[Revhendo]

Reversed the polarity when I 1st aquired the set.Keeps my heap under 200* and 180* on the expressway at 65 MPH:toothy6:

Yep, they'll turn in reverse for sure. Think of how well they'll work when you get the blades pitched correctly. See the curve in the blades? Great if you're using them as a puller, way less efficient if you're pushing with them that way. Cup your hand and put it a body of water. Splash the water with the palm side of your hand and then the other way with the backside of your hand. Which moves more water?

To get technical, it all depends on aerodynamic force which relies on two of Newton's laws of motion. Ask a pilot.

So, yep, they may be turning in the right direction, but the blades are facing the wrong way.

 

[biginch=bigfun]

I think I'm making a little progress...ran the car in the garge with no blower fan, clutch fan without a shroud, cap off radiator for 15 min. & temp was 210.

I bought a new radiator cap since mine won't reseat after it pops. And I plan to get started on building a shroud this weekend.

 

[biginch=bigfun]

forgot to mention that i timed it & it took 3 min to reach thermostat temp of 160.

 

[biginch=bigfun]

OK, I need to update you & get your input!

I added a bottle of water wetter, changed the radiator cap. set my timing to 12 initial & 38 total. idle set at 900 rpm. I put on a seven blade factory clutch fan. The shroad i built has to be re vamped so i took it off. I have no hood on the car.

I thought things were turning around because it would take longer to heat up & it would settle around 200 at idle. I did notice that the radiator is a good 2" low everytime after running & doesn't seem to pull fluid back from the overflow tank.
I decided to top the radiator off & take it for its first drive. first thing i noticed was the temp keeps climbing while going down the highway. second thing was all the fluid on my windshield from the overflow can. with the 160 therm. it reached 195 while moving. at idle it started to climb faster so i shut it down!
once it cools I'm going to check my fluid level (sure it will be low) & check my spark plugs.
I am soooo tired of this! After 25 years maybe its time for me & the car to seperate...