Wa Alaikum Salam.
Was the problem before the Radiator Flush too? (it seems it was there, but still need your confirmation)
2ndly, after radiator flush, did the problem remained the same? Or aggravated?
The "Jhaag" can be due to leakages in the cooling system with engine or weak head-gasket, radiator flush material not properly removed after flushing and some of it still in the system, etc., or any / all of it.
Is the Radiator Fan on Auto, or direct?
Is T-Valve (Thermostat valve) installed, or removed?
Are you using proper coolant, or simple, plain water?
Kindly elaborate. Thank you.