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The orifice tube is located on the inlet port or the primary evaporator on the passenger side of the firewall. It is nearly hidden behind/between the heater vertical hoses.
Are you sure it has a fixed orifice tube system? Most heavy duty trucks use a Thermal Expansion Valve (TXV) system. In both systems, the metering device (orifice tube or TXV) is located between the condenser outlet and the evaporator inlet.
It's a Peterbilt 379
The turn signal flasher relay switch, on a Peterbilt 379, is located under the dashboard. The relay simply plugs in.
2007
First indication is model year. The 379 replaced the 359 in production in 1987, and was manufactured until 2007.
How do you ajust the door on a 379 pete
Peterbilt 379
Dana-Spicer
1987
No
where is the defrost actuators located