Whiskey Junior
Member
- Joined
- Aug 16, 2021
- Posts
- 37
- Reaction score
- 62
- Location
- 22310
- First Name
- Dave
- Truck Year
- 1989
- Truck Model
- Suburban
- Engine Size
- 350
So my 1989 has the quick connect fitting that mates to the intake manifold and dumps hot coolant to the Heater Core. That fitting is known by all to be of a weak composition, and prone to failure.
I have to replace my Evaporator Box soon, and while I have all of that AC hardware loose from the firewall, I will be replacing the heater core. While this operation is happening, I am trying to prepare for a possible catastropic bend or break of that original heater hose and connector kluge that came directly from GM.
I don't want to find some NOS fitting to replace the old one with a similar type, but I am having problems locating the replacement part. GM had produced an adapter, PN 15-33220, that had both the 3/4 hose fitting and the 1/2 NPT intake fitting, but the 15-33220 has a restriction in the pipe to reduce the flow through the heater core in order to prevent premature failure/rupture of the core.
I figure I am stuck with modifying a standard 3/4 barbed fitting to 1/2 NPT, and fabricating a restriction to put in the adapter, but I'd like to have the part in hand before I start the job, so I havent any good way to measure the restriction orifice before starting the project. Do any of you folks here happen to know what the reduction diameter may be in that 15-33220 part?
I have included a picture of the part for reference, but I can't seem to find it anywhere online. Jegs thinks they have it, but their parts expert was unable to locate in the warehouse.
Thanks!!!!
I have to replace my Evaporator Box soon, and while I have all of that AC hardware loose from the firewall, I will be replacing the heater core. While this operation is happening, I am trying to prepare for a possible catastropic bend or break of that original heater hose and connector kluge that came directly from GM.
I don't want to find some NOS fitting to replace the old one with a similar type, but I am having problems locating the replacement part. GM had produced an adapter, PN 15-33220, that had both the 3/4 hose fitting and the 1/2 NPT intake fitting, but the 15-33220 has a restriction in the pipe to reduce the flow through the heater core in order to prevent premature failure/rupture of the core.
I figure I am stuck with modifying a standard 3/4 barbed fitting to 1/2 NPT, and fabricating a restriction to put in the adapter, but I'd like to have the part in hand before I start the job, so I havent any good way to measure the restriction orifice before starting the project. Do any of you folks here happen to know what the reduction diameter may be in that 15-33220 part?
I have included a picture of the part for reference, but I can't seem to find it anywhere online. Jegs thinks they have it, but their parts expert was unable to locate in the warehouse.
Thanks!!!!
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