Evaporator Core: Testing and Inspection

Check evaporator for leakage

Shown Using Model 168 as an Example:

Shown Using Model 463 as an Example:

DANGER:
- Risk of explosion from welding or soldering work on closed air conditioning system. Risk of poisoning. Inhaling overheated refrigerant vapors may be toxic. Risk of injury from skin and eye contact with liquid refrigerant.
- Do not carry out any welding work on the closed air conditioning system or in the surrounding area. No smoking or open flames. Wear eye protection and protective gloves. Work only in well ventilated areas. Carry out repair work on the air conditioning system circuit only after the system has been discharged.

CAUTION: Protect air conditioning circuit and components from moisture when carrying out repair work

1 Remove expansion valve
2 Install test adapter (1) in vehicle in place of expansion valve
- See "Special Tools" given below.

NOTE: Use new O-rings (2, 6) (coat with compressor oil) to install the test adapter.

- Screw for expansion valve
- Models 129, 140, 168, 170, 202, 208, 414: 8 N.m
- Model 220, 461, 463: 10 N.m

3 Connect tester to test adapter (1)
- Air conditioning leak detector
See "Commercially Available Tools" given below.

4 Check evaporator for leakage

NOTE: Apply maximum pressure of 20 bar to evaporator. Constant pressure must be maintained for at least 10 min.

- If in bad condition, Remove/install evaporator.

5 Install in the reverse order.

Special Tools

Test Adapter, P/N# 140 589 51 63 00:

Commercially Available Tools

Commercially Available Tools: