TOYOTA RETROFIT PROCEDURES
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- Special Notes:
- All retrofit procedures must follow SAE guidelines.
- Toyota has different levels of retrofit procedures.
- My recommendations are in line with the aftermarket recommendations.
Aftermarket recommendations are those of companies such as Everco,
Four Seasons and Murray.
- Recommendations From A/C Shops:
- Vehicles with POA valves may require adjustment.
Vehicles with dual evaporators may not have a large enough
condenser for use with R134a, and may present problems.
You should stay away from retrofitting Toyota vans if possible.
On all vehicles make sure:
- The condenser has clean fins and good air flow.
- There are seals around the condenser to improve the air flow through it.
- The fan clutch or the coolant fan motor is operating
- That any air dams etc. are not missing.
- MINERAL OIL REMOVAL
- None Recommended
We recommend that you remove as much oil as possible!
- FLUSHING THE SYSTEM
We recommend flushing of parts that are particle, see general retrofit
- O-RINGS & GASKETS
All o-rings and gaskets replaced should be R134a compatible.
We recommend that you cover all o-rings and fittings with mineral oil.
- HOSE REPLACEMENT
Toyota does not recommend the replacement of hoses unless they show signs
of leaking or the customer wants more than two years of service.
The compressor is not part of the normal retrofit.
When you do change a compressor make sure you know what type oil it
- CONDENSER AND AIR FLOW (HEAT EXCHANGE)
Toyota does not make recommendations of condenser replacement.
We see potential problems and needs in this area, see general retrofit procedures.
When you do replace the condenser, try to use a improve multiflow model.
- FILTER DRIER / ACCUMULATOR REPLACEMENT
Toyota recommends the replacement of the drier with one that contains XH-7
or XH-9 desiccant.
The expansion valve is not part of the normal retrofit.
Some shops I have talked to install new expansion valves when they retrofit
a dual evaporator systems.
The evaporator is not part of the normal retrofit.
- HIGH PRESSURE RELIEF VALVE (HPRV)
- HIGH PRESSURE CUTOUT (HPCO) SWITCH
We think a high pressure cut out switch is a worth while safeguard.
- OTHER PARTS
Compressor Seal: Replace if older than 1992 and customer wants more than
one year of service.
No other recommendations.
- OIL REPLACEMENT
Refill the system with a full charge of the proper PAG oil.
We recommend that you use Ester oil if you flush.
- SERVICE PORT ADAPTERS
Special R134a only service ports that meet SAE requirements are required by
- REFRIGERANT REPLACEMENT FOR R12
Recharge the system with about 15% less R134a than the R12 specification.
Special R134a service labels that meet SAE requirements are required by
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