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That's your problem. A thermostat change won't do any good. You are running 220. At 220 every thermostat out there will be open, if it's not, it's bad. The #1 problem with cooling systems is that people building bad cooling systems.

Yes, you want a good clutch fan. Finding a good, stock unit and putting a new clutch on it wouldn't be a bad way to go.

Looks to me like it's working now. 190-210 is completely normal. I wouldn't mess with it.

A property functioning Thermostat only regulates minimum temperature. If your car is running 200+ with a 180 stat, the 180 stat is open. Always run a thermostat on a street car, it adds greatly to long term engine life. Also, get rid of that crappy flex fan.

Your cooling system is capable of cooling the car, as indicated by the highway temps. At low speeds (below about 35 mph) the cooling system is relying on the fan for airflow. Over that speed, you don't even need a fan. So my best guess is that your fan is not capable of moving enough air or...

Your problem is airflow at low speed. If you aren't going directly after your airflow at low speed issues, you are wasting your time, in my opinion.

The pics in post #1 show the setup he is asking about. The do have good puller setups out there.

Like what? Small, un-shrouded, pushers in front of an AC condenser? If you need more info that supports my theory, just forum search for the hundreds of posts about cooling issues.

I seriously doubt the electric fan set up in the original post would cool your car at idle.

Even when my car was running high 11s in the 1/4 with its original, non stroked, 340, it could idle until it ran out of gas on a 100 degree day without overheating. Most cooling problems are owner caused by trying to reinvent the wheel. My secret..... 100% stock cooling system for an AC...

It may have a low % of engagement, no engagement at all or the thermostatic clutch may be engaging at the wrong temp. Or it could not be fan related at all. Here is a video of how to do the test. You are just touching the tips of the blades. Don't jam the whole magazine in there.

No it's not.

His cooling is fine once he gets moving, from what I understand. Building heat at idle is almost always a lack of airflow through the radiator.

No. You are not going to hold it stopped all day long. It's a fluid clutch. If it stops easy, you know it's bad.

Get your car up to the temp where you think it's hot at idle. Take a rolled up newspaper or magazine and see how easy it is to stop your fan.

Google "how to test a fan clutch". Everything else looks good to me.

Don't see why not.

Do you have a fan shroud? If running a clutch fan, is the fan clutch good? A pusher fan may help but I'm betting, you have better options.

Mopar sells a nice clutch fan.

Factory clutch fan and running 190. Sounds like the perfect combo to me. We have a bunch of people on here that go messing with a perfectly functioning cooling system, only to end up creating a "why is my car running hot?" Thread. Don't be one of those guys.

Your radiator is fine, as indicated by your ability to cool at speed. At speed, you done need fans because of the natural airflow. You just need something that moves air at low vehicle speed and idle. If you were to replace your cooling system with a completely stock big block cooling system...

That's a much better electric fan setup. It has a nice shroud that covers the radiator. What is that off of?

Clutch fan, shroud and 180 thermostat. That 160 is doing nothing for you. You should also seal the gap between the radiator and core support. If you don't have a hood to core support seal, get one.

I went with a NAPA rebuilt. It's been working fine for 8 years.

This video fully explains your cooling issues. You changed your thermostat because your engine was running at a perfectly normal operating temperature.

What is "a little bit warm"?

Assuming it's working correctly, yes. I personally don't believe it's working correctly. A standard flow stat could allow allow the coolant to stay in the engine longer, increasing the temp. But really, the first option should be to change the thermostat. The one in there now, for whatever...

I think he is saying that his 180 stat, for whatever reason, isn't regulating temp at 180.

I have had "bad", new ones, right out of the box.

You need a thermostat that works.