Overheating again...

MustangMatt1966 · Dec 7, 2004

classify overheating ( like steam ect coming out) i think mine might also have the same problem as his ( stock radiato with all the mods below) but it has never like "overheated" like i see people on the highway pulled over, but it def runs hot

Max Power · Dec 7, 2004

Easy rules when diagnosing overheating. If it overheats on the highway, you have a coolant flow problem or capacity problem. If it overheats in town, there is probably an air flow issue.

This does not count if a head gasket is bad, of course.

If you were strictly overheating on the freeway, that fan should have made no difference. Fans are worthless over 30mph.

I am surprised by your findings to say the least. Are you sure it was overheating just on the highway?

Paul619 · Dec 7, 2004

Max Power said:
Easy rules when diagnosing overheating. If it overheats on the highway, you have a coolant flow problem or capacity problem. If it overheats in town, there is probably an air flow issue.

This does not count if a head gasket is bad, of course.

If you were strictly overheating on the freeway, that fan should have made no difference. Fans are worthless over 30mph.

I am surprised by your findings to say the least. Are you sure it was overheating just on the highway?

it was the fan it was causing turbulance on the front of the ratiator and not letting air go through the radiator. now all is good though

WORTH · Dec 8, 2004

OK, if your problem is originating on the hyway it is NOT AN AIR FLOW PROBLEM, it IS A WATER FLOW PROBLEM, my guess is your Radiator is not big enough for your engine setup.

Paul619 · Dec 8, 2004

WORTH said:
OK, if your problem is originating on the hyway it is NOT AN AIR FLOW PROBLEM, it IS A WATER FLOW PROBLEM, my guess is your Radiator is not big enough for your engine setup.

why is my problem fixed now?

WORTH · Dec 8, 2004

Paul619 said:
why is my problem fixed now?

unless the fan was blowing backwards, it wont effect anything on the hyway. SO either you are giving mis-information, or you have the only car in teh world that needs a fan over 30 MPH

Paul619 · Dec 8, 2004

WORTH said:
unless the fan was blowing backwards, it wont effect anything on the hyway. SO either you are giving mis-information, or you have the only car in teh world that needs a fan over 30 MPH

it was most definitly blowing in the right direction... they way the fan was designed it was drawing a ton of air but it was also causing some sort of preasure on the front of the rad.. i tried everyting to see if it was going the wrong way and it was right.. it was just getting in the way i guess... i dont have any kinds of flow problems. SO problem solved and thats the end of it... thanks everyone that helped me out

cornholio · Dec 9, 2004

Paul619 I'm glad it worked and that I/we could help!

I also understand the skeptics and the physics behind the whole air flow / water flow thing that have been mentioned, and I don't have a positive answer, but the switch makes a big difference at any MPH depending on setup/condition. That is not to say, as I previously mentioned, that there isn't also a radiator problem here.

One thing is that the Flex Fan pulls a lot more air (as the motor's RPM's increase.) Higher RPM's = more heat. The MPH of the car increases the wind flow and that can make up some difference, but not all. The car/radiator still pushes a lot of the air. The fan does still help over 30 mph, just some cars more than others.

If the fan didn't assist at all above 30 mph, then you could remove your fan completely and go on a road trip on the expressway. 99% of the cars would go up in temp. Some maybe only 10-20 degrees, but most would overheat without a fan no matter the mph.

Paul619, my suggestion is to still get the best alluminum radiator that you can. With the better radiator you can run the electric fan and regain that H.P. Not to mention the motor also sounds a lot better with the electric fan.

WORTH · Dec 9, 2004

cornholio said:
Paul619 I'm glad it worked and that I/we could help!

I also understand the skeptics and the physics behind the whole air flow / water flow thing that have been mentioned, and I don't have a positive answer, but the switch makes a big difference at any MPH depending on setup/condition. That is not to say, as I previously mentioned, that there isn't also a radiator problem here.

One thing is that the Flex Fan pulls a lot more air (as the motor's RPM's increase.) Higher RPM's = more heat. The MPH of the car increases the wind flow and that can make up some difference, but not all. The car/radiator still pushes a lot of the air. The fan does still help over 30 mph, just some cars more than others.

If the fan didn't assist at all above 30 mph, then you could remove your fan completely and go on a road trip on the expressway. 99% of the cars would go up in temp. Some maybe only 10-20 degrees, but most would overheat without a fan no matter the mph.

Paul619, my suggestion is to still get the best alluminum radiator that you can. With the better radiator you can run the electric fan and regain that H.P. Not to mention the motor also sounds a lot better with the electric fan.

incorrect, you do not need a fan of anykind once your underway. That is a fact.

Paul619 · Dec 9, 2004

WORTH said:
incorrect, you do not need a fan of anykind once your underway. That is a fact.

slow your roll du, I understand that you have to be right. But hell give it a rest. what the other people told me to do worked so why are you arguing with people about it? are you certain that a fan wouldnt do anything at speed? you have info to back this up?

WORTH · Dec 10, 2004

Paul619 said:
slow your roll du, I understand that you have to be right. But hell give it a rest. what the other people told me to do worked so why are you arguing with people about it? are you certain that a fan wouldnt do anything at speed? you have info to back this up?

OK Dude, I've owned a Radiator shop for over 20 years, I have probubly worked on more overheating cars than you have ever seen in your life.I have owned more mustangs than you have driven, and solved more overheating problems on cars than you will ever own. What I stated is fact, you do not need a fan once your underway. If you don't believe this, drive any car with an electric fan on the hyway and the fan will never come on.UNLESS IT HAS ANOTHER COOLING SYSTEM PROBLEM.

AND if you go back to my first POST, I told you to DITCH the electric fan and put one back on the engine where it belongs. So if you headed my original advise this would have been a real short thread

And no, I'm not pissed

Paul619 · Dec 10, 2004

WORTH said:
OK Dude, I've owned a Radiator shop for over 20 years, I have probubly worked on more overheating cars than you have ever seen in your life.I have owned more mustangs than you have driven, and solved more overheating problems on cars than you will ever own. What I stated is fact, you do not need a fan once your underway. If you don't believe this, drive any car with an electric fan on the hyway and the fan will never come on.UNLESS IT HAS ANOTHER COOLING SYSTEM PROBLEM.

AND if you go back to my first POST, I told you to DITCH the electric fan and put one back on the engine where it belongs. So if you headed my original advise this would have been a real short thread

And no, I'm not pissed

oh i guess i got

but why did you have to go into telling me that i have flow issues... can you diognose my car over the internet? if it is fixed now going to a regular fan worked. why did that work if i didnt use a fan at high speed what did that fan do to my ar that it made it overheat? nm i dont really care anymore. it is fixed problem solved thanks again

WORTH · Dec 10, 2004

Paul619 said:
oh i guess i got
but why did you have to go into telling me that i have flow issues... can you diognose my car over the internet? if it is fixed now going to a regular fan worked. why did that work if i didnt use a fan at high speed what did that fan do to my ar that it made it overheat? nm i dont really care anymore. it is fixed problem solved thanks again

The only thing that I can think that would make sense is your electric fan was actually blocking the air flow, all sarcasm aside , you can take your blade right off the engine if you don't drive under 30. As a matter of fact if you are now using one of those flex fans, they are designed to flatten out at RPM so they are not pulling any air or using any HP at speed. The only thing better than a flex fan is a thermostatically controlled fan clutch, that will go into nuetral when the radiator is cool.

cornholio · Dec 10, 2004

I take one last crack at this. WORTH, your experience and profession have obviously given you the knowledge to be confident and correct most of the time. But, the flex mechanical fan does make a difference on SOME cars at highway speeds.

Example. I have a 66 Coupe that when I first started working on it, it had the 4 blade (factory) fan. The car would run, depending on outside temp. and speed, anywhere from 185 to 210 degrees on the highway. I changed the fan to a 5 blade flex (the one and only change at the time) and the highway temp never, ever, ever, went over 185 deg with the flex. Again, I only changed the fan, nothing else. Why? Because it pulls more air through the radiator even on the highway.

I realize that you know this, but, air takes the least path of resistance over/under the car that it can. Refer to a wind tunnel test. I understand that some air does flow through the radiator, but the mech fan evidently just pulls that much more through, thus lowering the temp.

You can say that I am mis-informing you or not being accurate about my results, but it is true.

I know that you have forgotten more about radiators/cooling than I will probably ever know, but the results are fact. Not only in my example, but with Paul619 and four others that are friends of mine with 66-68 Stangs with all form of mods.

I would not be so convinced that it does make a difference unless I experienced it first hand so many times.

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