The 2 rubber hoses going to the heater core. What diameter?

 

I used 5/8 heater hose from Auto Zone & cut it to fit. Start with the heat inner line & move the outer metal pipe out of the way by unbolting it from the inner pipe. That will greatly help you to get the new hose on.

 

Thanks. Going to replace it with clear hose...

 

Oh that’s interesting.

 

you dreaming of being stranded somewhere because your hoses will blow
clear hoses are not usually as strong your asking beggening for a problem

 

That is very true for clear hose from somewhere like Home Depot, but McMaster Carr has clear flexible hose in both high temp and pressure.

 

The hose is labeled as heater hose good up to 350 degrees and 70psi

 

HPS 5/8" ID Clear high temp reinforced silicone heater hose, Max Working Pressure 70 psi, Max Temperature Rating: 350F, Bend Radius: 3"

 

You probably know this but just a heads-up, that hose is sold $10.50 per foot.
It's $7.50 on HPS website, IDK what shipping does to that price.
Either way it will work just use smooth hose clamps made for silicone hose.

> HPS 5/8" ID 16mm High Temp Reinforced Braid Clear Silicone Hose - Sold per Feet

 

I bought this same HPS hose too. I’m going to reverse the coolant flow into the heater matrix.