A/C - Evaporator Icing
85saab01FILE IN S.I. Man. VOL. I
SEC. 8 PG. 84
Service Information
SUBJECT: CORRECTING AC EVAPORATOR ICING ISSUE: 01/85-732 M80-85 SAAB 900 MODELS WITH AC
AC evaporator icing may occur if the location of the thermostatic switch capillary tube is incorrect or the switch has failed. New capillary tube locations in the evaporators have been developed for 900 models from 1980 to 1985 that should keep the risk of icing to a minimum. (NOTE: M79-early M80 900's with "VIR" AC systems do not have this thermostatic switch.)
Should icing occur, refer to the capillary tube locations and troubleshooting described below.
M80-83 Models
1. Withdraw the capillary tube and mark the tube with a wrap of tape 130 mm from the end of the tube. This insures that only the correct length (130 mm) will be inserted into the evaporator.
2. Work the tube into the evaporator at the angle and location described in drawing 1. Check that the recirculation door moves freely.
3. Test the system. Should icing still occur, replace the thermostatic switch (P/N 85-93-766) and again correctly locate the tube.
NOTE! Some 1981 models may have insulating foam instead of black "tar strip" insulation and may not use these procedures. Instead, refer to the locations recommended in Service Manual Section 8 (p. 854-36).
M84-85 Models
Before re-locating or installing a new thermo-static switch, the evaporator must first be identified as to brand of manufacturer (Borletti or Sanden). Both types are still being fitted during production.
Borletti - The flanged nut (1) at outlet pipe is made of copper.
Sanden - The flanged nut (1) at outlet pipe is made of aluminum.
M84 - w/Borletti evaporator
1. Withdraw the capillary tube and mark the tube with a wrap of tape 130 mm from the end of the tube. This insures that only the correct length (130 mm) will be inserted into the evaporator.
2. Work the tube into the evaporator at the angle and location described in drawing 3. Check that the recirculation door moves freely.
3. Test the system. Should icing still occur replace the thermostatic switch (P/N 85-93-766) and again correctly locate the tube.
M84- w/ Sanden evaporator
1. Withdraw the capillary tube and mark the tube with a wrap of tape 130 mm from the end of the tube. This insures that only the correct length (130 mm) will be inserted into the evaporator.
2. Work the tube into the evaporator at the angle and location described in drawing 4. Check that the recirculation door moves freely.
3. Test the system. Should icing still occur replace the thermostatic switch P/N 85-93-766) and again correctly locate the tube.
Warranty Information (for cars in warranty): For relocating the capillary tube only, use Failure Code 87062-06-0-01-05 and the time allowance is 0.2 hour which is entered as straight time on the claim.
For relocating the capillary tube and then replacing the thermostatic switch, use Failure Code 87062-06-0-01-01 and the time allowance is 0.4 hour which is entered as straight time on the claim.