Tbird temp light concerns - Page 2 - Triumph Forum: Triumph Rat Motorcycle Forums
Hinckley Classic Triples 885cc Classic Styled T3's: Legend, Thunderbird, Thunderbird Sport & Adventurer.

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post #11 of 29 (permalink) Old 08-03-2017, 10:34 PM
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Wanted to update you all. Looks like there was a bubble of air stuck in the radiator - even though i bled it a couple of times - third time worked a charm.

Thanks everyone!


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Glad you've got it resolved. Thanks to your thread I may find nirvana too


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post #12 of 29 (permalink) Old 08-09-2017, 07:36 AM Thread Starter
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Glad you've got it resolved. Thanks to your thread I may find nirvana too


Zee
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Hey zee - any luck on your issue?


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post #13 of 29 (permalink) Old 08-09-2017, 07:56 AM
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Hey zee - any luck on your issue?


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Tested the fan switch and the temp light on sat and managed to get them both to work. The fan wasn't coming in till I swapped out a fuse. The old fuse is sent blown but I thought I might as well change it. Took it for a good 80 mile ride on Sunday. It was about 69 degrees and I didn't have the fan come on. If there is still an issue it's probably just due to my ability to bleed it inaccurately


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post #14 of 29 (permalink) Old 08-09-2017, 10:04 AM
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Sometimes those fuses can look fine but just not carry current.

Next time I go for a ride I'll try to get a reading on the temperature sensor when it's at operating temperature. Easier to make comparisons that way. (No need to remove the sensor or get it to 60 degrees C.)

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post #15 of 29 (permalink) Old 08-14-2017, 11:01 AM
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Tbird temp light concerns

Update: no coolant leaks anymore. Fan connection when grounded: works fine, temp light test: work fine.

Went for a traffic ride yesterday into the city. The engine got real hot. No light came on, neither did the fan but the engine felt really hot on my knees and shins. So obviously the fan is not coming on when needed. Should I be riding with this issue? What should I check next?


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post #16 of 29 (permalink) Old 08-14-2017, 11:25 AM
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From all tests and indications, everything is working as designed. An inexpensive infrared thermometer on the water neck out of the head should be absolute confirmation. Harbor Freight sells a decent one.
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post #17 of 29 (permalink) Old 09-26-2017, 07:24 PM
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Had the same symptoms again during the dgr and had almost all my coolant from the extra reservoir spill over the engine and headers again. Gonna have to test this again and diagnose the problem.


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post #18 of 29 (permalink) Old 10-02-2017, 11:33 AM
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Have you had your thermostat out and checked?
There should not so much pressure in your system to cause your reservoir to fill and spill if everything is opened up and flowing normally.

A quick check is to squeeze all of your rubber hoses when the bike is properly warm...especially the ones that go to the thermostat housing and check for even pressure and temperature. This could also explain the fans' strange operation and excessive heat from the motor. You may have a buggered thermostat, or some air trapped at the top of the housing.

Just my .02 cents.
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post #19 of 29 (permalink) Old 10-24-2017, 01:27 PM
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Update: finally got some time with a forum buddy @simplyj to help me diagnose the problem.

The bike had not been ridden since the DGR and coolant overflow issue.

Upon removing the tank we noticed that the cap off the extra coolant reservoir was off. I know I had shut that properly the last time so itís obvious that happened due to pressure from the coolant expansion reservoir.

We swapped out the fan switch, checked that the temp light works and also checked the thermostat in a pot of hot water. Everything seems to work fine.

We concluded that it might just be an air bubble in the radiator.

We filled up the radiator, let it run, rocked it side to side, then tried to squeeze all hoses to get air out. We noticed a very small amount of bubbles from the radiator bleed screw. We took the bleed screw off completely to see if more coolant come out trying to eliminate all air inside. Even with the bleed screw off no coolant was gushing out until we loosened the radiator cap and took it off for a second there was like a fountain of coolant from the bleed screw area. I guess the air was trapped in there somehow.

We finally topped up the radiator and closed off the bleed screw. The only test that we have not done is to replace the temp sensor. I ask because the temp light never came in when the coolant heated up and overflowed. @simplyj said it could be possible that due to the air pocket the coolant was just stationary and heating up. The engine may not have reached the required temperature for the temp light to come on.

Any other suggestions from the great crew here. Rode the bike back home few miles but no fan came on. Is there a way to check when the fan should be coming on.


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post #20 of 29 (permalink) Old 10-24-2017, 11:14 PM
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I have seen situations in cars where the temp light goes off when the sender is in air, not water. Had a situation in a race where a driver called in and said his temp light was on, so we asked him to pit. Later in the lap he said it was off - and it was off cause he was out of water. Luckily we knew that and brought him in and found a belt thrown off. Saved the motor.

I would wait on the sending unit till you get a chance to put some time on it. You still riding? Getting pretty late in the year up there.
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