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Water pump, radiator, checked compression all done. Jumped fan to stay on constantly, still overheating. Any ideas. I'm am stumped . Maybe cat?

 
Rep Power: 512

Properly burp the coolant system?

 
Rep Power: 119

What do you mean “water pump”? You just replaced it with a brand new OEM pump that the impeller can’t spin off on?
What do you mean radiator? You measured flow through and used thermal imaging to check for blockage?
What about coolant level?
Was the thermostat tested?
Are the fins of the AC condenser degraded?
Are you using 50/50 coolant mix?

 
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Well what do you mean ? Water pump is a water pump like the one driven by the new timing belt.radiator I think is self explanatory, who all here has thermal imaging capabilities? 50/50 coolant yes, new thermostat yes the condenser is a little degraded yes.

 
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Yes I got the air out of system. why do my fans only come on for a few seconds when up to temp.

 
Rep Power: 119

Exactly my point, what basis are you using to exclude the waterpump and the radiator from being the issue?

 
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What is your point exactly? To sound like a snob? Cause that's all I'm getting

 
Rep Power: 119

My point exactly is you seem to believe every part you have is fine, but your car is overheating due to some mysterious reason.

Your car literally cannot overheat when all those parts you listed are working correctly.

So, by trying to understand what qualifies you as being able to determine a part is good, I can spend my time giving you direct suggestions.

My first though is you bought a crap waterpump and the impeller is slipping/ broken/ poorly designed flow characteristics..

I asked you directly if you installed a new Honda pump.
Now if you answered, yes Slumpert, I replaced the waterpump with a actual OEM Honda bought unit when I did my timing belt job. I would go onto my second though that the radiator was junk.

But instead of answering my actual question, you wrote “Water pump is a water pump”..
No, cheap *** waterpumps fail the cooling system by allowing the impeller to slip, fall off, bad flow design, simply wrong size.

Indeed, I am a snob when it comes to people using cheap parts for critical areas of the car.

What are the chances you or the previous owner poured a bottle (or more) of stop leak in the coolant?

 
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You must work for Honda

 
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I do not work for Honda and I 100% agree with @Slumpertcivic

 
Rep Power: 119

Your cars’ issue is poor coolant flow.
Cooling fans shutting off while car is over heating and car still overheats when cooling fans are forced on = poor coolant flow through radiator.

Waterpump, thermostat, radiator.
One or more of those items is not working to spec.

If this was my car, I would
Spend $30 for a actual Honda thermostat.
Spend $90 for a amazon brand radiator
Spend $15 for a actual Honda radiator cap.

No one here is going to “parts cannon shame” you for replacing those items as even if they were not the issue, they are due for replacement at 15+ years old.

If it was still trying to overheat on me (and still not losing coolant / forming air pockets in radiator) I would replace the water pump with a actual Honda water pump $75.

 
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Turns out it was the oem thermostat. I bought a new aftermarket quality thermostat for 5 bucks more then the oem and my problem is gone