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
properly.
- 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
-
None Recommended
We recommend flushing of parts that are particle, see general retrofit
procedures.
- 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.
- COMPRESSOR
-
The compressor is not part of the normal retrofit.
When you do change a compressor make sure you know what type oil it
contains.
- 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.
DT>EXPANSION VALVE
-
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.
- EVAPORATOR
-
The evaporator is not part of the normal retrofit.
- HIGH PRESSURE RELIEF VALVE (HPRV)
-
No recommendations.
- HIGH PRESSURE CUTOUT (HPCO) SWITCH
-
No recommendations.
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
law.
- REFRIGERANT REPLACEMENT FOR R12
-
Recharge the system with about 15% less R134a than the R12 specification.
- LABELS
-
Special R134a service labels that meet SAE requirements are required by
law.
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