I don't know about the outside diameter of the hoses but, the outside diameter of the heater core inlet and outlet tubes are 3/4" (inlet) and 5/8" (outlet).
The heater hoses are 5/8 inch diameter.
5/8
Remove the heater hoses from the heater core at the firewall and hook them together. In order to connect to two same diameter hoses together, get a 5 or 6 inch piece of pipe which is the same diameter as the heater core tubes from which the hoses were removed. Install the pipe halfway into one hose and secure tightly with a worm-drive hose clamp. Then once secure, do the same with the other hose.j3h.
it's on the outside on the passenger side.near the heater core hoses.
disconnect both heater hoses at the firewall and splice them together using a piece of pipe same diameter as inside diameter of hoses. insert a 3-inch piece of pipe into both hoses and clamp both hoses on it. good luck
remove both hoses from the heater and join them with a short piece of pipe about the size of the inner diameter of the hoses. use 2 hose clamps to sealed and hold the hoses on the pipe. Or- cut the hoses and do the same type joining. later you will need another pipe and two more clamps if you want to rehook it to your heater core.
hese hoses are called "heater hoses" they are from the front heater hoses which heat the car and they are connected to the front heater hoses under the car hood on right side
In line on the heater hoses on the passenger side of the engine. Has a small vacuum line to it and both heater hoses go through it. The heater hoses are smaller than the radiator hoses and go through the firwall.
The 1999 Chevrolet Camaro heater hoses will have a swivel nut on each end of the hose. Turn the swivel nuts to the left and the heater hoses will come off. Reverse the process to install the new heater hoses.
The heater hoses on a 305 engine run from the intake manifold to the heater core and the heater core to the radiator. This creates a constant source of heat to supply the heater.
I think they are just called heater hoses.