So my car overheats very quickly if I don't have my heater on. If I have my heater full blast and I obey the speed limits it stays at 220 for a while. This used to never be a problem. Anyone have an idea why this is? Also did a radiator flush to get most of the rust out of my block. 3 Days later it's full of rust again. I'm stumped.

I was also thinking about getting a low temperature fan switch. I heard they make this so your fan will come on much earlier. But I can't seem to find one. Could someone point me in the right direction?

85 T/A 305 TPI

 

might take several flushes to get all the rust out of the
cooling system;after i swapped a used '84 vette engine
into my car i had to flush it 4 times to get the coolant
to stay green IF you can get the block drains/knock
sensor out,you will get a better flush as settled rust
will drain out better.