Half in is the OEM position.
What fan are you using?
engine displacement?
A/C ?
The more details…the greater the chance of keyboard diagnostics 🤷

 

i took it to shop and they replaced the radiator and schrod it is fixed 180 deg idling and running down the road

 

Maybe post pics of the two shrouds.

 

i do not have the old one it is in the dump it look like someone cut it to fit that is why it cracked.

 

it also overheats when idling

 

If all you did was change the shroud and the overheating started immediately after then most likely that’s the problem.

 

Post a pic of the shroud installed in the car

 

If it is overheating while moving at a reasonable pace this is indicative of inadequate flow or an undersized radiator. Shroud & fan are for low speed and idling conditions.

When is the last time you changed the thermostat? Are you sure all air is out of the system? Belt tight on pump and not slipping?

 

it overheats at idle also stat is new removed air belt is correct not slipping

 

schrod pictures

 

Maybe I'm wrong but that water pump doesn't look like its new, seems to be a cast iron one that has been sitting around for a while, it looks rusted. Your radiator.........looks like a aluminum one and you mention its a 3 core with 1" tubes. Is this correct?

 

nevermind

 

That doesn't look like a Camaro shroud.. reminds me of one off a Monte Carlo or Chevelle

Looks like the NOS one for a Camaro I have in stock, GM part #3893812 and the original one on my car and the other ones I've seen.

 

For one thing the fan should be half way in the shroud, not buried in it as it appears to be.

 

i think you are right i am trying to find a way to solve it

 

If you have a “long” water pump, that would likely cause this sort of problem.

Just an observation from where I sit.

The shroud looks like the one on my 67.

 

i have a long water pump how do i solve the problem fan to far in schod

 

I would cut the shroud to fit the fan 1/2 in 1/2 out.

 

Is this car new to you?
The coolant level is full?
I see the serpentine belt system. Is the fan turning the correct direction?

 

i think that is the answer it is a camaro schrod i have a long water pump and a thicker radiator but it will make it week could crack like the one i took off

 

Since you have a long waterpump I would probably try a 69 Camaro fan shroud.

 

Scrod. Past tense of screwed. Or catch of the day.

I doubt fan depth is the problem. I run the same shroud, original clutch fan, Prestone 50%, short Edelbrock water pump, healthy radiator and it never, ever gets hot idling or at 80+ mph. How are your water pump and radiator? How does your coolant look?

 

water pump is new, new radiator 3core 1"pipes i just put new 50/50 mix in

 

Is that a 4 blade fan?

 

5 blade

 

Also, the shroud does not envelop the entire area of the core. All components must work as a cooperative system to cool efficiently. And can be done without thowing electric fans at it like so many think is the best thing on the planet for every application.

 

i took electric fans out it overheated with them

 

Timing? Vacuum advance at idle?

 

Can I get an answer for post 15 please?

 

increase the timing by 8 degree and see what happens

 

The info provided is confusing.

initially my understanding was the only change the OP made from the car running cool to overheating was replacing the broken shroud. And the new one extended almost to the engine.

obvious to me if this was the only thing changed it caused the issue.

if other things were changed in addition to the shroud then it’s anybody’s guess to the overheating.

 

only the schrod was changed

 

It doesn't look like it has a/c from what I can see. But sealing the gap between the core support and the radiator will improve cooling air going through the radiator and fan.

If it an a/c car, let us know. More tips will be given'

 

no ac

 

Bella2024 said the problem is going down the road, that has nothing to do with the shroud. The shroud is not wide enough to cover the entire radiator from the picture. While that won't cause any problems going down the highway sitting at an idle or slow moving traffic it will because the fan won't pull through that area of the radiator. The fan position inside the shroud and the depth etc won't have any impact on the cooling going down the road at any significant speed, the fan isn't pulling any faster than the air is blowing through the radiator. It's clutched so it won't impede the flow either. There is something else causing the temperature creep going down the road IMHO.

 

Post number 5 says it also overheats idling. Pay attention Steve!

 

bad clutch fan ?