Can't figure out my overheating issue

[cdn66satellite]

I am almost lost with what to do next. Over heats on the highway goes up to 220.
26" alum rad
160 thermostat
elec fan
shroud.

im wondering if this flat shroud is stopping air flow on the highway.

 

[Hemi Rebel]

Typically an overheating issue on the highway is a lack of heat dissipation from the radiator. Either its partially clogged, or blocked. Exhaust flaps in the shroud would definitely help

 

[cdn66satellite]

Typically an overheating issue on the highway is a lack of heat dissipation from the radiator. Either its partially clogged, or blocked. Exhaust flaps in the shroud would definitely help

The rad is only a month old but a chance it could be clogged?

 

[Hemi Rebel]

Highly doubt it. More like not enough airflow through it.

 

[cdn66satellite]

Highly doubt it. More like not enough airflow through it.

So it overheats in the city without the shroud. But overheats on the highway with the shroud haha. Can't win

 

[Blackbird73]

Your engine might be lean at highway RPM?

 

[62 Dart Convertible]

Try removing the shroud and drive it.

From experience, I would test or just replace the thermostat first. (To test, place in a saucepan of water on stove with thermometer too and check it opens as it should.)

 

[cdn66satellite]

Been there. I would test or just replace the thermostat first. (To test, place in a saucepan of water on stove with thermometer too and check it opens as it should.)

I thought it was the stat too and just replaced it. Maybe should try another one

 

[69Runner]

I'm by no means an expert but I was recently researching Spal fans and my understand is the puller setup is best (as is yours), and a big V8 needs at least 2500 cfm which should pull around 20 amps. Spal also makes one rated at 3000 rpm / 50 amps. Your setup looks pretty nice, what triggers the fan to run?

 

[snakeoil24]

So it overheats in the city without the shroud. But overheats on the highway with the shroud haha. Can't win

Two different issues here.

If it overheats in City without shroud means not enough air being pulled thru tjhe radiator. On Highway overheating is not enough air being pushed thru radiator. Ditch the electric fan and change to 185 them to start. Then use a seven blade clutch with a much larger opening for the air to push thru on Highway.

 

[cdn66satellite]

I'm by no means an expert but I was recently researching Spal fans and my understand is the puller setup is best (as is yours), and a big V8 needs at least 2500 cfm which should pull around 20 amps. Spal also makes one rated at 3000 rpm / 50 amps. Your setup looks pretty nice, what triggers the fan to run?

temperature sensor in the rad turns on at 170. I just found this fan in the garage so I'm wondering if it doesn't pull enough. But yet it works fine in the city. As soon as the car sees 50mph plus the temp starts climbing

 

[Hemi Rebel]

That shroud is a brick wall preventing air flow at higher speeds. It needs vents. Like so

 

[bigmanjbmopar]

At what temp do you have your fan set to come on at? Try lowering that setting to 180° and see if that helps.

 

[Dennis H]

I'm with snakeoil. 180 Stant Superstat.

 

[WileE]

Trash that fan/shroud. Use a Factory clutch fan & shroud.

 

[Car Nut]

Trash that fan/shroud. Use a Factory clutch fan & shroud.

:yes:

I can't see blocking that cross flow rad, most efficient on the market.

 

[cdn66satellite]

Trash that fan/shroud. Use a Factory clutch fan & shroud.

Yep, tired of this electric fan. Time to go back to what has worked forever.

 

[Bigal75]

The shroud is to close to the rad. Put flaps or re think your shroud set up. Take a ride to the wreckers and go measure some shroud fan assemblies and use one of them.

 

[AZBelvedere]

I just fought the same battle on my 66 Belvedere. I started out with one 16" electric fan and shroud w/ a steel radiator. It stayed cool in the city and overheated on the highway. I even tried running the fan without the temp switch (always on), that didn't work either. Then I bought a new US Radiator aluminum 1" tube 2 core w/ 19" clutch fan. That helped keep it cool on the highway, but without a shroud, it temped up in the city. After I added a 1" fan spacer and a factory shroud, it stays nice and cool everywhere I go. Like others above have stated, its better to stick with the cooling system the car was designed with.

 

[Funship32]

I don't want to wade in with a seemingly silly comment but I do have to ask: Do you have an anti collapse spring installed in your lower radiator hose? Seeing as you have a new rad and at speeds should have enough air to cool the fluid, I cannot help but wonder if the hose is collapsing...