I have noticed my left cooling fan is not working? I took it out and tested and it's working, the fuses are ok relay was not looking good I changed it.

Still not working andy idea on the fix?

TIA

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95' Diablo

In addition to the fuses and relay, I would think there would be a thermostat that controls it?

Hazim, you need to narrow options down. As Raymond suggested; first check fuses. Then see if power is actully getting to fans when engine is clearly hot, measure voltage at both fans.
There are two collant sensors (one for each bank) that sit between the banks at the back of the engine. They are NTC types (Negative Temp. Coefficient), that is the electrical resistance decreases with increasing temperature. I seem to remember from about 10KOhms @ RT down to 100 Ohms at 100 Degrees Cent. Anyway it is unlightly both are bad at once. See if they are the same.

Do both fans not work? I seem to remember on some cars one comes on, then later the other -- could be wrong on this -- anybody else?

There are three coolant sensors on my [91] car. They are all next to each other at the top of the thermostat. The outside ones are the sensors for the LIE fuel injection [cold start]. The middle one provides the supply to the temperature guage.

thank u guys for your feed back, the left one is not working. I'll try to switch the sensors.

will get back to you.

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95' Diablo

I don't think switching the sensors is the answer. The L and R sensors supply info to the LIE comuters relating to cold starting / fuel injection.

Or to put it another way, when I have had the coolant temp sensors go bad, and this has happened on both sides, the sensor throws a check engine light, and all is not well at cold start, but the fans still come on together, even though the sensors fail into "open circuit" mode.

What if I disconnect the sensor will this make the fan start as soon as i start the car?

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95' Diablo

on my 91, one of the pins in the connector plug (from the fan) corroded and broke off, i replaced the plug with 30 amp conectors

Very common problem. If breaking off from corrosion doesn't get it first, the melting from the high impedance will. Had the same fix done on my 99 roadster.

-mick