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Old 03-01-2011, 10:42 AM   #1 (permalink)
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Default Extra Water Temp Gauge

Whats the best way about putting another water temp gauge in? Either tapping into the water output hose or renewing the water sensor and have both the dash and extra come off it? Thanks
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Old 03-01-2011, 11:05 AM   #2 (permalink)
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Anyone know what size the hoses are that go to the radiator? Thanks
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Old 03-01-2011, 11:54 AM   #3 (permalink)
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Just so that you're aware - if you're using an electrical gauge, the gauge and the sender are a "matched" pair - don't expect to use an after market gauge with the factory sender or vice versa, and don't try two gauges to one sender.

Also - for best results - the sender needs to be mounted - on a Samurai - in the intake manifold, as close as possible, to the original sender location - you want it to be "upstream" of the thermostat.

If you put it in the top radiator hose, which is "downstream" from the thermostat, it will not indicate the coolant temperature in the engine, and will show cold until the thermostat opens and coolant starts to circulate - what you will see is the engine showing cold for quite awhile, and then very suddenly come to normal temperature - if the thermostat fails shut, the engine will overheat before the gauge moves from cold.
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Old 03-01-2011, 11:57 AM   #4 (permalink)
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Ok, so its the bottom radiator hose, its 34mm ID right?
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Old 03-01-2011, 12:17 PM   #5 (permalink)
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You know - I almost included a paragraph on the bottom hose in the first reply - if you put a temperature sensor on the bottom radiator hose, what you will get is the temperature on the water returning from the radiator after it has cooled - you will never know how hot the engine is running.

You will also suffer from all of the previously mentioned ills of having the sensor in the top radiator hose - no indication of temperature before the thermostat opens, and if the thermostat fails shut ....

As I said earlier - the best place is in the intake manifold - on the G13 engine used in the Samurai, the water flows through the block, through the head, into the intake manifold and then through the thermostat if it is open out to the radiator - for ideal results, you want the sensor in the water jacket, in the intake manifold, and as close to the original sender location.
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Old 03-01-2011, 12:24 PM   #6 (permalink)
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So how do i get it in there? :P Sorry to sound stupid
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Old 03-01-2011, 12:43 PM   #7 (permalink)
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What i mean is, are there any spare holes where i can put it in. I want to keep the stock one and leave it well alone. If you take the original one out then the ECU would play havock.
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Old 03-01-2011, 04:54 PM   #8 (permalink)
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Maybe you should go take a look at the intake manifold - see how many sensor ports there are, and how many sensors are fitted, if you're lucky there will be an unused port or a sensor with nothing connected - if not consider drilling and tapping a hole somewhere appropriate.

By the way - I'm pretty certain that the ECU has it's own sensor and is not connected to the temperature gauge sender.
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Old 03-01-2011, 06:46 PM   #9 (permalink)
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I think the ECU does use the gauge sender for water temp on the samurai. There's also a temp sender for the block which I believe is oil temp. If you want to look for an easy tap into the water jacket you can use the hoses going to the thermal plunger on the back side of the carburetor. there's a supply and a return line. It's what your carburetor uses to determine the temperaure, and it's always cycling coolant from the water jacket so it's a good gauge of the engine coolant temp.
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Old 03-01-2011, 07:24 PM   #10 (permalink)
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Here's the wiring diagram for a '90~92 Samurai (courtesy of Ack's FAQ) the water temp gauge sender (yellow/white wire) goes to two places, the gauge and the a/c coupler - you'll find this sender just above and to the left of the ECU on the diagram.

There is a separate water temp sensor for the ECU (grey/yellow & red/yellow wires - the grey/yellow wire is common to all the ECU sensors, the red/yellow wire connects only to the ECU) - you'll find this sensor below the ECU on the diagram, grouped with all the other ECU sensors.

All of the early Suzuki EFI systems function this way - the ECU sensors are separate and have their own wiring. I haven't really looked at the newer (post 2000) systems, but, up to the '98~05 Grand Vitaras, the gauge sender and the ECU sensor are electrically separate units.
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