Monday, October 22nd, 2018 AT 1:31 PM
What is the proper I.D. Of the auxiliary heater hose? Inner and outer diameter. On my vehicle this diameter appears to be 5/8" but the outside is 1". Typically replacement hose is 5/8" inside and 3/4" outside. Could be this was changed from the factory installation but maybe there was a reason for 1" outside diameter from the factory that is important for the rear heater. Insulating value maybe?

