Help! 1996 temp sending unit

[squeakg]

Does anyone know where the temp sending unit is that operates the cooling fans? I know about the one on the water pump that operates the gauge.

 

[KOPBET]

The ECT sensor located on the block between plugs 6 & 8 (roughly) operates the analog gauge only.

The ECT sensor located on the water pump is monitored by the PCM for everything else.

 

[squeakg]

I've replaced the one on the water pump but my fans still won't come on unless I turn the a/c on. Any suggestions?

 

[vetteoz]

fans still won't come on unless I turn the a/c on.

Both fans are running?
Hi or low speed ?
It would appear your fans / relays and wiring ( or at least one setup ) are fine because turning on the A/c sends a signal to the PCM to run the fans

There are two fan speeds controlled by 3 relays

Both fans run at slow speed when the PCM grounds pin A11 which energizes Relay #1.

Both fans run at high speed when the PCM grounds pin A11 and pin A10 (All 3 relays are energized).

 

[squeakg]

Both fans are running but I don't know about the speeds because I didn't know there were two speeds. Thanks for the info and diagram. I'll check it out.

Both fans are running?
Hi or low speed ?
It would appear your fans / relays and wiring ( or at least one setup ) are fine because turning on the A/c sends a signal to the PCM to run the fans

There are two fan speeds controlled by 3 relays

Both fans run at slow speed when the PCM grounds pin A11 which energizes Relay #1.

Both fans run at high speed when the PCM grounds pin A11 and pin A10 (All 3 relays are energized).