I have a 91 SL1 and the engine overheats when I stop in the traffic.
I have never heard or see that radiator fans spinning.
Can it be coolant temperature sensor or the fan itself?
Any body any idea, how can I resolve this problem
cheap and easy way.
cooling fan wont turn on i want to know where sensor is located so i can replace it to find out if thats the problem or is there any way i can test the fan motor still works?
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Re: 91 SL1 problem
The sensor is located at the rear side of cylinder head between transmission and engine under the thermostat hosing but make sure to have some one aply direct power to fan to se if fan still goos if not replace it, and the sensor all what you have to do to test it start the car unplug the sensor and if the fan come on then replace the sensor i will recomend to replace thermostat also and make sure is full of coolant
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the thermostat was not the problem but the viscous fan hub ( fan clutch) is
while it is spinning , there is no drive action when idling ( as at lights , slow traffic , hills in low gear etc) and so it is not pulling air through the radiator when needed
your statement that the temp reduces as soon as you start moving means that with forward movement the air is flowing through the radiator and cooling the coolant
If it only overheats when stopped and stays cool or normal when driving that I would suspect that the radiator fan is not working. Check the obvious like fuses and relays. The relay can be swapped with another identical relay in the fuse block. If those check out than you will need some more advanced diagnostic equipment and info. If you up to the challenge I can provide you with some more in depth info to help you solve.
there are 2 or 3 fans up front on all A/C equipped cars.
the fan closed to engine (rad rear) turns on parked and idling
all engines will overheat parked, if the fan goes dead.
so are you saying this fan is dead.?
if it dont overheat moving fast then the cooling system is usually good
and then you stop at a traffic light this fan must turn on.
on cars with 3 fans , some stage up, 2 on if too hot. or all 3 on.
the FSM covers this logic clearly.
in the USA car.
the element has 2 fans (some engine options my differ)
the right fan is for A/C
and left fan is for engine cooling, (im looking at alldata.com to see that)
the fan turns on via a relay that he PCM controls
the PCM see the ECT sensor in the engine go to over say 225F and
it closes the relay, and the fan spins at full speed.
fuse 4 runs this relay, in the fuse box
the relay and fuse are named
My guess is that your electric fan is NOT operating at all. Under normal conditions, just going down the highway, your cooling system will function just fine without a fan running. The air flow through the radiator is adequate to keep things cool. However, when you stop, you quickly get into an "overheat" situation. Actually, you should be able to hear your fan begin operating when your engine temperature starts climbing or your air conditioner requires the fan to do its thing. Note: If you've ever severely overheated your engine, your problems may be worse than just a fan not running, but you really do need to confirm whether your fan is operating correctly, or not. Another note: I had a vehicle with a tendency to overheat when stopped. It turned out to be a faulty (leaking) pressure cap on the cooling system.
Check the fuse for the fan and use a test light to make sure that the circuit is functioning. Warm up your car then feel along the top and bottom of the radiator to check for cold spots. If you find any then you may need to replace your radiator. If your heater isn't currently working it may be that since it is a part of your cooling system.
So far you did the right things in the right order. If you have a pressure cap (looks like a radiator cap to the rear side of the engine. Dealer $15) change the pressure cap also and then flush the radiator. A sure sign of blockage is when you open the radiator look around inside the top if you see brown or green kind of gunky stuff. Flush the radiator anyway.
If after the radiator is flushed and you still overheat, the next posibility is the head gasket. But don,t worry yet, follow these steps and observations. (this goes for 93 camry V6 also, I have one)
change radiator cap and pressure cap where applicable
Change the thermostat.
Some cars may have a thermo switch which ramps up the fan(double fan designs). Change that if applicable.
flush the radiator and engine block
change waterpump AND headgasket.
The temperature guage can tell you what you need to know.
If the guage starts to spike up after stopping, pausing in traffic or while in gear not moving but it is fine while driving along the highway, then you are having a blockage in the cooling system. FLUSH SYSTEM.
if there is a bubbling sound in the engine when you turn it off, FLUSH SYSTEM
If the car overheats at anytime, anywhere and it drinks coolant like a fish, then you my friend have a headgasket problem. Change waterpump and head together
I had the same problem on my SL1 2002 and my wifes SL2 2001. In both cases, the electric radiator fan motor needed replacing. It was not difficult but took me a full day of trying to figure out how to pull the plastic housing it is mounted in. Someone who knows what they are doing could have changed it in a half hour. Works great now.