Author Topic: Temperature light  (Read 2678 times)

Offline Schnellfahrer

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Temperature light
« on: August 27, 2022, 04:49:58 PM »

Greetings,
When I turn on the ignition before starting the engine on my '95 K75 the oil pressure and the charging lights on the Tachometer come on and go off when the engine starts up.  However, the temperature light never comes on.  Is that normal? Recently I experienced a coolant leak and the fan came on . One would think this would be a good time for the temp light to light up but it did not. Somehow I cannot believe that this a case of a burned out  bulb.
Any advice or comments are greatly appreciated.
  • Edenton, NC
  • 1995 BMW K75

Offline Laitch

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Re: Temperature light
« Reply #1 on: August 27, 2022, 05:35:40 PM »
Recently I experienced a coolant leak and the fan came on . One would think this would be a good time for the temp light to light up but it did not.
One might think that, but one would be incorrect. In an engine running appropriately, the fan comes on to regulate coolant temperature. That is usually in stop-and-go traffic/hot weather or if the coolant level is too low. That's normal. The temperature light comes on when the fan is unable to regulate coolant temperature. When that happens, the rider should stop, check for leaks, check the coolant level in the reservoir then let the engine cool down before proceeding.

Where's the coolant leaking?
  • Along the Ridley in Vermont.
  • 1995 K75 102,000 miles

Offline frankenduck

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Re: Temperature light
« Reply #2 on: August 27, 2022, 06:07:18 PM »
Before you start the bike:

There's no oil pressure - light on
Alternator not spinning or generating current - light on
Engine coolant below 232 degrees - light off

The fan comes on at 217 degrees to keep the coolant from getting up to 232 degrees when the temp light illuminates.
Once I had a Collie pup. Dug a hole and covered him up. Now I sit there by the hour. Waiting for a Collie-flower.
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Offline Schnellfahrer

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Re: Temperature light
« Reply #3 on: September 20, 2022, 05:16:03 PM »
Thanks for your reply.however, it does not answer my question.  When I turn the key and turn the ignition on BEFORE  starting the engine the alternator and oil pressure warning lights come on.  I guess as a bulb test. However, the coolant temperature light dos NOT come on.  All want to know is if "normally" this light should come on too.
Please advise and thank you.
  • Edenton, NC
  • 1995 BMW K75

Offline frankenduck

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Re: Temperature light
« Reply #4 on: September 20, 2022, 05:32:58 PM »
Thanks for your reply.however, it does not answer my question.  When I turn the key and turn the ignition on BEFORE  starting the engine the alternator and oil pressure warning lights come on.  I guess as a bulb test. However, the coolant temperature light dos NOT come on.  All want to know is if "normally" this light should come on too.
Please advise and thank you.

Reread my post: Before the bike is started the temp is below 232 so the light does not come on.

Once I had a Collie pup. Dug a hole and covered him up. Now I sit there by the hour. Waiting for a Collie-flower.
New to K bikes? Click here.
K Bike Maintenance & Mods: Click here.
Buy parts here.

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