Thermoswitch; Evaporator - Mazda MX-5 1990 Workshop Manual

u
ON
U-34
AIR CONDITIONER
4
05UOUX-057
05UOUX-058
05UOUX-059
On-vehicle Inspection
Thermoswitch
1 . Remove the glove box.
2. Run the engine at idle.
3. Turn OFF the AIC switch and set the blower switch to the
highest position to operate the blower fan for a few minutes.
4. After a few minutes, turn OFF the blower switch and stop
the engine.
5. Disconnect the thermoswitch connector and check for con-
tinuity between terminals of the switch.
Terminals Continuity
a-b
Yes
6. If not as specified, replace the thermoswitch.
Note
• The thermoswitch contacts will be open if the
evaporator temperature is below
ooe
(32°F).
Inspection
Thermo5witch
1. Immerse the sensing bulb in a container of ice water.
2. Check continuity between terminals of the switch as
specified.
Terminals Temperature Continuity
a-b
Above
ooe
(32°F) Yes
Below OOC (32°F)
No
3. If not as specified, replace the thermoswitch.
Evaporator
1. Check the evaporator fins for blockage. If the fins are
clogged, clean them with compressed air.
Caution
• Never use water to clean the evaporator.
2. Check the fittings for cracks and other damage. Replace
the evaporator if necessary.