Hey does anyone know the ID hose for the hoses that are going on the inlet/outlet of the heater core? I want to do this flush below. I know there is a chance that CLR will hurt the heater core but at this point it might screwed anyway as it’s completely clogged.


https://youtu.be/LtnVyFNyU1w?si=r-K_F47NbE499BC2

 

Same question here. So many hoses, which one is IN and OUT?!?

 

already on the other post

the id must be around 15mm measure the old heater valve

 

Yes i saw it but right after my comment/question here 😀. Will try to flush the core and update! Its a shame that i didnt do the procedure when i was replacing the heater change over valve...

 

modern coolant systems don't fill with gunk - unless some serious misbehaviour in the vehicles history - I expect using "products" available will cause much more harm than any possible benefit

 

Agreed. In the bad old days we would see radiators plugged up with silicates used in coolant. From the factory. After 3-4 years Many many radiators got ‘rodded out’ via removing end tanks and forcing rods through the cores to get the ick out followed by flushing. This is why ‘radiator shops’ have mostly dried up and gone away.

Modern coolant does not plug up radiators or heater cores.