Over heating

[Gypsy]

I have a Monaco 66 with a 383 Engine if the outside temp is over 24 C she will overheat
I was told a oversized water pump may help ? I installed an extra electric driven cooling fan
the only thing that helps a little is if I turn on the heat in the vehicle
Your input will be much appreciated

 

[Sixpactogo]

I see you have a shroud and it looks like a flex fan. Is this a new issue? Is it only at idle? Or does it overheat at highway speeds? We need more info as to when this problem started and what you have done so far.
Personally, I never liked those flex fans. I prefer the thermo clutch 7 blade fans with the shroud. It could be any number of things such as a plugged radiator, timing issues, thermostat issues, belt slippage, collapsed hoses. Nice car by the way.

 

[volksworld]

first thing to try is if radiator is clogged ....with the level down look in and see what the ends of the tubes look like....a good radiator shop (if they still exist in your area ) should be able to flush it or worst case take the tanks off and rod it out or even re-core it...but with the current price of copper a re-core is not cheap

 

[CBODY67]

I concur on the flex fan. When they came out in the 1970s, they were considered a "power saver" so lots of hot rodders put them on their cars. Can cool well, but generally noisy, even on the highway with proper placement in the shroud. Been there, done that, went back to an OEM-brand fan clutch and the factory fan.

One thing not usually considered is accumulation of "gunk" in the rear of the block's coolant passages. When was the last time those were cleaned out? A messy job, for sure, but necessary in some over-heat issues.

Generally, if the radiator is clean and the block coolant passages are clean, no "over-heat" should happen.

High capacity water pumps can be counterproductive, from my experiences, although they look great on paper and in theory. But on the vehicle I put one on, actually an aftermarket casting which was more ample in dimensions with clean internal castings, the temp needle was 1.5-widths higher on the gauge, with the same 180* F thermostat. Contrary to their sales literature!

Now, finally, what is your definition of "over-heating"?

Take care,
CBODY67

 

[Big_John]

As said, there's a lot of reasons it could be overheating. Some details of the car might help.

Some possible causes are already listed and I'll add bad thermostat, missing "splash shields" or hood seal.

Regarding the flex fan... I saw one come apart on a friend's car when he was on the starting line at the local drag strip. One blade came up through the hood. A local guy got killed when a blade broke while using a timing light. So yea, I don't like them at all.

 

[Gypsy]

I see you have a shroud and it looks like a flex fan. Is this a new issue? Is it only at idle? Or does it overheat at highway speeds? We need more info as to when this problem started and what you have done so far.
Personally, I never liked those flex fans. I prefer the thermo clutch 7 blade fans with the shroud. It could be any number of things such as a plugged radiator, timing issues, thermostat issues, belt slippage, collapsed hoses. Nice car by the way.

Thank you for your information, no its not a new issue it started 20 years ago when I received the vehicle from my son as a gift ,The radiator is clean, I have installed an extra Electrical cooling fan in front of the radiator, I also installed a transmission oil cooler in front of the radiator ,the overheating starts when in Idle and the outside temp is above 23 C., she doesn't overheat when driving, the hoses are all ok, when she idles and I turn on the inside heat and fan it helps a little to cool the engine down? I don't know the timing and leaning for the 4 barrel carb, perhaps the carb is leaned to much ? I will check the water pump and belts as you suggested , are there larger water pumps available for the 383 engine ? the ignition is changed to an electronic ignition are there cooler spark plugs available for this engine ?

 

[Big_John]

Define "overheating" as what are the temperatures the car is reaching.

Some guys see 200° F and figure that's too hot.

 

[Gypsy]

Define "overheating" as what are the temperatures the car is reaching.

Some guys see 200° F and figure that's too hot.

It has idiot gages that isn't showing temp in F ?

 

[Gypsy]

As said, there's a lot of reasons it could be overheating. Some details of the car might help.

Some possible causes are already listed and I'll add bad thermostat, missing "splash shields" or hood seal.

Regarding the flex fan... I saw one come apart on a friend's car when he was on the starting line at the local drag strip. One blade came up through the hood. A local guy got killed when a blade broke while using a timing light. So yea, I don't like them at all.

Thanks for the info, I installed a new Thermostat I am not familiar with the Splash Shields and Hood seals ?

 

[Big_John]

It has idiot gages that isn't showing temp in F ?

View attachment 694952

Where in the range is it? Sometimes, those gauges aren't real accurate.

I'd suggest buying an infrared temperature gun and checking the engine temperature near the sender.

 

[Big_John]

Thanks for the info, I installed a new Thermostat I am not familiar with the Splash Shields and Hood seals ?

Hood seal. Helps redirect air through the radiator

Your '66 should have a metal "stone deflector" that is bolted between the radiator support and the bottom of the bumper. That also helps keep the air flowing through the radiator.

What temperature thermostat did you change to?

 

[CBODY67]

In the instrument panel gauge, the "boxed" area under the main line indicates "normal range". Usually, about 1/2 way from "C" is about 200*F, a 180*F thermostat should put it just a bir below 1/2 way.

Where is the needle staying?

CBODY67

 

[Gypsy]

Hood seal. Helps redirect air through the radiator

Your '66 should have a metal "stone deflector" that is bolted between the radiator support and the bottom of the bumper. That also helps keep the air flowing through the radiator.

What temperature thermostat did you change to?


View attachment 694959

View attachment 694964

 

[Gypsy]

Hood seal. Helps redirect air through the radiator

Your '66 should have a metal "stone deflector" that is bolted between the radiator support and the bottom of the bumper. That also helps keep the air flowing through the radiator.

What temperature thermostat did you change to?


View attachment 694959

View attachment 694964

Thanks much appreciated

 

[Gypsy]

Where in the range is it? Sometimes, those gauges aren't real accurate.

I'd suggest buying an infrared temperature gun and checking the engine temperature near the sender.

I have one good idea thanks

 

[Sixpactogo]

If you don't overheat going down the road and only at idle, your radiator is fine. You simply are not moving enough air at idle. If it were me, I would ditch that flex fan and install a 7 blade fan with thermo clutch. That flex fan is not your friend IMO. You didn't say which thermostat you put in but a 180 should be good.