Ok, all fuses are good. I replaced the A/C(Elect Fan) relay module and the fan still doesn't come on. I have 1990 2.3l. I am going to put in a new coolant temp sensor this weekend, but my actual question is about the so call coolant "switch". Is the coolant switch the same thing as the sender? I'm doubting that they are the same, but I also can't picture there being a coolant temp sensor, a coolant sender and a coolant switch. Any help? If the coolant swith is a seperate device, does anyone know where it is. I know where the other two devices are.
Ok, all fuses are good. I replaced the A/C(Elect Fan) relay module and the fan still doesn't come on. I have 1990 2.3l. I am going to put in a new coolant temp sensor this weekend, but my actual question is about the so call coolant "switch". Is the coolant switch the same thing as the sender? I'm doubting that they are the same, but I also can't picture there being a coolant temp sensor, a coolant sender and a coolant switch. Any help? If the coolant swith is a seperate device, does anyone know where it is. I know where the other two devices are.
THanks!
U should have 2 sensors for coolant.The sender is the one for light or gauge.The switch is for the fan.Try turning on a/c inside of car to see if the fan comes on.Also the switch goes through your main computer of the car then power comes from it to turn the fan on.Not sure where they are at because mine is both on intake.My fan would'nt work,but once i replaced the switch it was fine.Also does your module have a fuse built in it.Mine does,had to put bigger fuse in my module.
Thanks Phil. It seems like you are saying the coolant switch is probably the same as the coolant temp sensor. I've tried turning the A/C on and the fan does not come on at all which worries me because it should automatically come on, regardless of the engine temp.. right? My relay module(I assume we're both talking about the little box under the dash kinda by the steering column above the fuse box) doesn't have a built in fuse.
Thanks Phil. It seems like you are saying the coolant switch is probably the same as the coolant temp sensor. I've tried turning the A/C on and the fan does not come on at all which worries me because it should automatically come on, regardless of the engine temp.. right? My relay module(I assume we're both talking about the little box under the dash kinda by the steering column above the fuse box) doesn't have a built in fuse.
Yes it is.Sounds like you don't have any power going to it.Check the fan by running a power supply yourself to it.Might be a wire problem in the circuit. My module is mounted on the fan.The computer pretty much runs everything on the car.
Thanks again Phil. I've checked the fan and it does operate when power is applied directly from the battery. I'm guessing the module you are talking about it is the constant control module. Since my car is a 90 it doesnt use that, it uses a relay module. They started using the CCRMs in the '91s. On the other you may be referring to a completely different module since I don't know where the CCRM is mounted. Anyway, I'm going to do a little more probing. I guess I could have a problem with my A/C Dem switch(whatever that is??) and the cyclic pressure switch. My next step is a mulitmeter probe and an ECT replacement. Thanks again Phil.
Thanks again Phil. I've checked the fan and it does operate when power is applied directly from the battery. I'm guessing the module you are talking about it is the constant control module. Since my car is a 90 it doesnt use that, it uses a relay module. They started using the CCRMs in the '91s. On the other you may be referring to a completely different module since I don't know where the CCRM is mounted. Anyway, I'm going to do a little more probing. I guess I could have a problem with my A/C Dem switch(whatever that is??) and the cyclic pressure switch. My next step is a mulitmeter probe and an ECT replacement. Thanks again Phil.
I'm talking about the ecm computer i just forgot the name of it,usually is mounted on pass side underneath dash,but not sure if your car has it.
Thanks NavySVO. See I know where the gauge sender and I know where the temp sensor that goes to the ECM is I just don't know where that fan sensor is... if there really is one. I'm down to thinking there either there is no fan sensor and the gauge sender acts as the fan swtich OR the guage sender and the fan switch are two different things. Also, shouldn't the fan come on automatically when the the AC is turned on? Damn this fan.
Thanks NavySVO. See I know where the gauge sender and I know where the temp sensor that goes to the ECM is I just don't know where that fan sensor is... if there really is one. I'm down to thinking there either there is no fan sensor and the gauge sender acts as the fan swtich OR the guage sender and the fan switch are two different things. Also, shouldn't the fan come on automatically when the the AC is turned on? Damn this fan.
Most elec fan should come on with ac.So your fan should come on with ac.Maybe u have a loose wire or a short.
Try to see if the year differences in years don't spread to this subject.
On the '84-86 SVO, the sensor in the top of the upper intake (between #2 and #3 injectors) is for the EEC.
The bottom side of the lower intake (in the center) is the switch for the fan.
Ok, so I got my fan to turn on, but only when the A/C was on and I shorted the cycling pressure switch on the condensor. So the cycling switch is bad(I think it could also be that the coolant level is low or something.) BUT! My fan still doesnt turn on when the temp is hot. My questions is this: Is the temp switch that is on the lower intake manifold both the temp switch AND the guage sender? If so, I'm confused because my temp gauge reads the temp and it shows hot, but the fan still doesn't come on. Is this possible? Thanks a lot guys.
The 89-90 have the same location for these sensors. Anyway, I changed the temp switch and sure enough, the fan came on.... and stayed on!! ha, now I have the opposite problem. It never turns off. I'm thinking that maybe the resistance scale of the new temp switch is lower than the stock one or something. Other than that I don't know. Oh, and it seems this one wire temp witch is not for the temp gauge on the dash since the temp gauge still reads correctly when I unplug the temp switch. Hmmm...
Ok, I finally figured it all out. I'm sure some of you will roll your eyes at this whole thing since it's so simple. To get to the point and to summarize, the Engine Coolant Temp(ECT) sensor is found between injectors 2 & 3, the electrican fan temperature switch is found on the underside of the upper intake manifold, and the temperature sender for the gauge is found on the back of the block on the driver's side below the oil pressure sender. I finally found the temp sender when I was replacing the oil sender. Anyway, I feel like a bonehead. Also, my fan doesnt turn off, I believe, because I asked the guy at the autoparts store for a fan temp switch and he gave me the temp sender. I guess he didn't know the difference either.
Electric Fan Problem - Help 
