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Discussion Starter #1
Hey Guy's. I've got a 91 RD04 AT that seems to be running cold.
where should the temp gauge be sitting during normal operation ?
Mine only just about makes it off the cold mark and sits on the bottom of the main mark. It has risen to the halfway mark a few times whilst stuck in london mayhem and then the fan kicks in.

just thought I'd ask before I take the tank off to see if previous owner has removed the thermostat. £40 for a new one.
 

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Commuter Extraordinaire
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My @'s temperature needle seldom moves far from the bottom of the gauge except when stuck in really heavy traffic when it starts to rise, and then the fan eventually cuts in, so your symptoms seem quite normal to me. If the stat was removed the fan would always be off (or indeed always on if connected to the power supply).
 

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OVALTEENY !!!
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Spook

That's where mine runs and every other AT I know runs the same :thumbup:
 

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... mine only just about makes it off the cold mark and sits on the bottom of the main mark .... to see if previous owner has removed the thermostat. £40 for a new one.
id have thought the gauge wouldnt move if the thermostat had been removed?
 

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Sweet !
thanks guy's :thumbup:
Stienberg. on my bike the thermostat is under the tank near the steering bearings. I thought the fan control sender unit was attached to the radiator ???

Thanks again guy's
 

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Generalissimo Tea Boy
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Hey Guy's. I've got a 91 RD04 AT that seems to be running cold.
where should the temp gauge be sitting during normal operation ?
Mine only just about makes it off the cold mark and sits on the bottom of the main mark. It has risen to the halfway mark a few times whilst stuck in london mayhem and then the fan kicks in.

just thought I'd ask before I take the tank off to see if previous owner has removed the thermostat. £40 for a new one.
This sounds totally normal for an AT to me. I've had three and they all do that sir....unless there's something wrong with them.

I can sometimes go for a year or more without the fan switching on.
 

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Engines can actally run hotter with the thermostat removed. As the thermostat regulates flow, too fast a flow will see the coolant pass through the radiator too quickly, and not have time to cool.
i dont think i phrased that very well... i thought it was the thermostat that control the engine temp gauge movement... ie... no thermostat... no gauge movement...
 

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i dont think i phrased that very well... i thought it was the thermostat that control the engine temp gauge movement... ie... no thermostat... no gauge movement...
The thermostat itself isnt attached to anything at all. It simply sits in a housing blocking the water flow. As the water heats up, the wax inside will expand, moving the seal, and letting the water circulate.
Theres a seperate sender unit (which can be anywhere in the system, like the radiator) which reads the temperature and sends it to the guage
 

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Sounds perfectly normal to me

My 1990 RD04`s thermostat has only ever moved off the bottom once in its life

mind it it was off the bottom for a whole fortnight :D


Best way to test it is too travel to Morocco go into the Desert with the worng tyres on, grossly overloaded and no riding talent and you will definately see the gauge rise like Tiger Woods on Viagra.

Note I did say the best way to test not the cheapest :D
 
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