This problem started out with my cooling fan not coming on. I thought it was the relay so I found the relay for it and jumped out the terminals with a paper clip and the fan started working but after a few minutes the engine wouldnt start back up so I found the main engine relay and jumped out the terminals and got the engine to run. I used a test light to identify which terminals were hot and ground to narrow down which terminal to jump power to. I thought it was the relays so I got all new relays but the engine still wont run on the relays. So I figure the relays are not getting proper input from somewhere else. Does anyone know what the problem could be?

 

Year of car and engine type, 4-cyl or V-6?

 

91 Toyota Camry DX 2.0 liter 4 cylinder. Automatic.

 

Do the following test.

Find the coolant temp switch that controls the fans. Look on the engine coolant intake manifold.

With ign key on, unplug the switch. The fans should come on.

 

I will do the test but I already replaced the ect on the top of the manifold with a new one. No result. There is another sensor sticking out down on the side of the manifold and I replaced it with a used on with no result.

 

Best to start with diagnostics.

The coolant system has a number of sensors. One is an on/off temp switch. By unplugging this switch, the fan system is tested.

Does the car have working A/C? If so with the engine running, turn on A/C and watch the fans. They should turn on/off when the A/C compressor turns on/off.