Radiator Cooling Fan Temperature Sensor / Switch: Testing and Inspection

Fig. 5 Checking Water Temperature Switch.:

1. Using an ohmmeter, check coolant temperature switch, Fig. 5, as follows:
a. Check that continuity is present when coolant temperature is below 181°F.
b. Check that no continuity is present when coolant temperature is above 201°F.
c. If continuity is not as specified, replace switch.
2. Inspect cooling fan motor relay (inside relay center at LH inner fender) as follows:
a. Check that there is continuity between terminals 1 and 2.
b. Check that there is continuity between terminals 3 and 4.
c. Apply battery voltage across terminals 1 and 2, then check that continuity is absent between terminals 3 and 4.
d. If continuity is not found as specified, replace relay.

Fig. 16 Checking Engine Main Relay.:

3. Using an ohmmeter, check engine main relay (inside relay center at LH inner fender), Fig. 16, as follows:
a. Check that continuity is present between terminals 1 and 3.
b. Check that there is continuity between terminals 2 and 4.
c. Check that continuity is absent between terminals 4 and 5.
d. Apply battery voltage across terminals 1 and 3.
e. Check that continuity exists between terminals 4 and 5.
f. Check that continuity is not present between terminals 2 and 4.
g. If continuity checks are not as specified, replace relay.
4. Connect battery and ammeter to fan motor connector, then check that fan spins smoothly and amperage measures 5.8-7.4 amps on manual transmission-equipped models, 8.8-10.8 amps on models with automatic transmission.