Thermo-Time Switch
Resistance between terminal “W” on thermo-time switch and ground
The required resistance values differ between thermo-time switch models.
The resistance should reach 0 Ohms (continuity) with engine temperature below:
Bosch part no. |
Temperature (F) |
Temperature (C) |
|---|---|---|
0 280 130 219 |
50 |
10 |
0 280 130 221 |
56 |
13 |
0 280 130 214 |
86 |
30 |
The resistance should rise to infinity with engine temperature above: Infinite resistance with engine temperature above:
Bosch part no. |
Temperature (F) |
Temperature (C) |
|---|---|---|
0 280 130 219 |
68 |
20 |
0 280 130 221 |
74 |
23 |
0 280 130 214 |
104 |
40 |
If resistance value lies outside of specification, thermo-time switch is defective.