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Old 12-22-2010, 08:49 PM   #1 (permalink)
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Default samurai electric fan not kicking on???

1987 tintop sammy electric oem fan wont kick on ???checked inline fuse at starter area and its ok do you think it is the fan thermal switch at thermostat area????is one the oil temp sensor and the other the fan temp switch...allready checked fan and it runs strong wired direct thanks.
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Old 12-22-2010, 09:46 PM   #2 (permalink)
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I could be wrong, but I don't think Suzuki put an electric fan on the Samurai - I will verify this from the parts catalog in the morning. As far as I know they all had a belt driven fan mounted on the water pump although, depending on the market, there may or may not be a viscous clutch between the two.

If I'm right, you'd have to figure out how the particular set up on your vehicle is wired and then troubleshoot it - you know the the fan works, so now you have to figure out how it's wired - and you need to know that not everyone wires the electric fan to a thermo switch.

There is no oil temperature sensor on a Samurai, and as far as I know, no fan switch on the thermostat housing - there is a gauge sender and I believe a second sensor that controls the choke.
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Old 12-22-2010, 09:56 PM   #3 (permalink)
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thanks i cant beleive they didnt use a oem fan especially on a AC sammy but maybe so,but doesnt the thermostat have to communicate with something to tell fan to kick on i have seen whats called a engine coolant fan temp switch so where is that located and wouldnt that be what allows fan to kick on and off!!! ALL my wireing seems oem too for the most part!
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Old 12-22-2010, 10:16 PM   #4 (permalink)
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Hi there Highpockets,

Based on your description, it seems that the problems lies with the thermo switch. I assume you are referring to the fan behind the radiator(?). Same response with fordem as that I've never heard of stock electric fans on an 87 model Sammy.

My friend encountered the same problem with his electric fan and finally changed his thermo switch. He used a thermo switch from a 90's model toyota corolla. It fixed the problem.

Hope this helps!
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Old 12-23-2010, 03:57 AM   #5 (permalink)
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there were a few samurais equipped with factory A/C. not terribly common. I know that the aftermarket AC units send a signal to the high idle compenstor when running. Perhapse if equipped with an electric fan it opperates off of the same signal being sent to the Idle-up vacuum switch. I'm not familiar with the factory AC so I can't offer much advice other than to check the high idle signal and make sure it's working with the ac on. If there is a seperate electric fan for the A/C system then it should be on whenever the A/C is used, regardless of engine coolant temp.
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Old 12-23-2010, 05:24 AM   #6 (permalink)
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Quote:
Originally Posted by Highpockets View Post
thanks i cant beleive they didnt use a oem fan especially on a AC sammy but maybe so,but doesnt the thermostat have to communicate with something to tell fan to kick on i have seen whats called a engine coolant fan temp switch so where is that located and wouldnt that be what allows fan to kick on and off!!! ALL my wireing seems oem too for the most part!
Where is the fan you're asking about? In front or the radiator or behind it?

From the parts catalog Samurais never came with electric radiator fans.

If the Samurai has factory a/c, there will be an electric fan for the a/c, and that will be mounted to the a/c condensor which will be in front of the radiator, and there will also be the standard mechanical cooling fan on the front of the water pump.

The a/c fan is not there to cool the engine and is not wired to the engine's cooling system, it's there to dissipate the heat from the a/c system and is controlled by the a/c amplifier, and will run in sync with a/c compressor.

On most factory a/c systems, there will be a temp sensor that connects to the a/c amplifier that will shutdown the a/c system if the engine overheats, and this may also activate the condenser fan.

You now need to figure out whether you're looking at an aftermarket engine fan, or the a/c fan (essentially does the vehicle have a/c) and then determine if the fan is working as it should and then troubleshoot it.
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Old 12-23-2010, 05:36 AM   #7 (permalink)
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thanks has factory ac but not hooked up,and yes the fan is on the front outside of the vehicle so your telling me that it would only be needed for the ac system and was put there for that purpose....if thats the case then what to do about engine getting to hot i have a new brand new engine and weber carb that runs great but after driveing it for a while it just gets to hot and the overflow radiator bottle spews out fluid....clutch fan seems fine and it pures like a sowing machine so what would you guys suggest me doing to remedie this????
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Old 12-23-2010, 05:43 AM   #8 (permalink)
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also radiator appears to be free of any rust but is a stock one!!
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Old 12-23-2010, 06:58 AM   #9 (permalink)
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Quote:
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thanks has factory ac but not hooked up,and yes the fan is on the front outside of the vehicle so your telling me that it would only be needed for the ac system and was put there for that purpose...
Exactly!!

Quote:
if thats the case then what to do about engine getting to hot i have a new brand new engine and weber carb that runs great but after driveing it for a while it just gets to hot and the overflow radiator bottle spews out fluid....clutch fan seems fine and it pures like a sowing machine so what would you guys suggest me doing to remedie this????
You have a problem that needs to be identified & fixed.

Stock radiator should be ample cooling for a stock engine provided it's clean & not clogged - and this has nothing to do with rust - when last was that one cleaned? What condition are the hoses in? Waterpump? Radiator cap? How do you know the clutch fan is fine?

Where did you get a brand new engine from? Do you mean a remanufactured engine? Is it the same size as the original? Who did the work? Who jetted the weber? Is the timing correctly set? What thermostat is in it? Was the head retorqued after the first thousand or so miles - if not the head gasket could be gone.

There are many, many possible causes for overheating and you'll need to check them all.

Try to identify when (what conditions) the overheat occurs - when stationary & idling, in heavy traffic, uphill towing, highway speeds, etc. - as this information can usually be used to pin point problem areas.

As an example - a stock radiator in good condition can handle the heat output of the stock engine at highway speed with no fan, depending only on the forward motion of the vehicle to force air through the radiator - if your engine were overheating under these conditions, the problem would either be more heat than normal (lean mixture, incorrect timing) or less cooling than normal (insufficent coolant flow caused by hoses, pump, radiator).

Another example - an engine that overheats in traffic and parked & idling, but not at highway speeds would point to insufficient air flow through the radiator - which point to a failing clutch fan.

One more thing - define "spews out fluid" - is it boiling over or is it overflowing?

It's normal when the engine heats up to have expansion and fluid being transferred to the overflow bottle (it's actually an expansion tank), and what is supposed to happen is that when the engine cools, the fluid is drawn back into the cooling system - but - a defective radiator cap can hold pressure and allow the expansion but not the return.

Caps are cheap and easy to change, so if your's isn't new or nearly new, and you're not having a violent boil over, change it.
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Old 12-23-2010, 07:01 AM   #10 (permalink)
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Given that its a brand new engine then I would suspect that you have an airlock in the cooling system. The easiest fix that I've found is to run the engine with the rad cap off and the heater on. Keep an eye on the coolant level, when the thermostat opens you should see the coolant level drop as the air comes up.
If that doesn't fix it and you don't see inrush indicating that the thermostat has opened then the thermostat may need replacing. If the thermostat seems OK then I'd get a leak down test done to check that the new engine is good
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