thermosensor ???

[98pacecar]

Rode the 98 for the first time after dark last night.   

Noticed on the 15 mile ride 3 times the temp light in the tach would come on,, for only a part of a second 

Could this be due to a loose/dirty connection at the thermosensor errrr,,,, what?

The brevity of the light looked to me like a loose connection,, making contact. 

Shop manual,,,, does not say, a lot,,,, about this....    ???

Thanks, Jim

[98pacecar]

Also is this circuit a make on ground type.

Where when the wire to the sensor goes to ground, the light is lit?

If that's the case, I may have a floating ground in the wire somewhere...   

[BonS]

What year is your Valk? There are two coolant temperature sender/switch circuit designs in play here:

1997-1999 models have a thermosensor that connects to a module that converts the signal to turn on the temperature light. (This is the one that varies its resistance with temperature.)

2000+ models have a simple thermostatic switch that directly connects to the temperature light. (I can't find a temperature where this switch kicks in.)

The thermosensor should read 47-57 ohms at 176 degrees F and 14-18 ohms at 248 degrees F. If its off by more than 10% is should be replaced. They want the sensor to be immersed up to its threads and the temperature to be stable for 3 minutes or longer.

The fan switch should come on (~0 ohms) around 234-244 degrees F.
The fan switch should turn off (very high ohms) around 199-207 degrees F.

The thermostat should begin to open at 176-182 degrees F.
The thermostat should be fully open at 199-206 degrees F.

[indybobm]

On 97-99 Valkyries, the temperature sensor activated the temp light in the tach by way of a 'Indicator Unit' module that is behind the left side cover and coolant overflow bottle. This module has caused the problem you are describing in many bikes. On later bikes, Honda used a thermostatic switch that went directly to the light in the tach. The Honda service manual has a procedure for checking this circuit in 97-99 Valkyries to determine what is malfunctioning.  There is also a write on this board describing how to use the later model temperature sensor and what wiring changes to make. On a 97-99 Valk, the temperature light should come on for ~2 seconds when you turn the key on. This, along with the trouble shooting guide, is per the Honda Service Manual starting at page 19-11.

Basically either method puts a ground on the temperature light in the tach. The 97-99 method was a little convoluted and prone to failure. You can replace the module or change to the later method by changing to the thermostatic switch on the thermostat housing and moving a wire from the module behind the left side cover to the new thermostatic switch.

Module Part No. is 38710-MZ0-003 and the current HDL price is around $46.35.

[98pacecar]

''What year is your Valk? ''




Sorry, should have said,,  98 standard   

(but it is in my siggy) 

So this common problem is it just an annoyance, a false reading?

Nothing to worry bout? (sounds like that)

Errrr should I address it, to prevent possible,,,, damage to the motor.   

[98pacecar]

On 97-99 Valkyries, the temperature sensor activated the temp light in the tach by way of a 'Indicator Unit' module that is behind the left side cover and coolant overflow bottle. This module has caused the problem you are describing in many bikes. On later bikes, Honda used a thermostatic switch that went directly to the light in the tach. The Honda service manual has a procedure for checking this circuit in 97-99 Valkyries to determine what is malfunctioning.  There is also a write on this board describing how to use the later model temperature sensor and what wiring changes to make. On a 97-99 Valk, the temperature light should come on for ~2 seconds when you turn the key on. This, along with the trouble shooting guide, is per the Honda Service Manual starting at page 19-11.

Basically either method puts a ground on the temperature light in the tach. The 97-99 method was a little convoluted and prone to failure. You can replace the module or change to the later method by changing to the thermostatic switch on the thermostat housing and moving a wire from the module behind the left side cover to the new thermostatic switch.

Module Part No. is 38710-MZ0-003 and the current HDL price is around $46.35.

I only have the clymers..    

Thanks,,,,,,,,fer da part #

 found it fer $39.73 at partzilla.

Jim

[indybobm]

This is the link to download a pdf version of the Service Manual from Dag over in Norway. 

http://valkyrienorway.com/download.html

[indybobm]

You can also download very good wiring schematics from the Rattlebars section.

http://www.rattlebars.com/valkfaq/schematics/

Standard/Tourer on the left side of page. I/S on the right side.

Under Standard/Tourer you will see S1..S2..S3.. etc. These are schematic pages for the various parts of the Valk. 

Look at S6 and S6a. These include the wiring for the temperature light.
S6 is for 97-99 Valks
S6a is for 2000-2003

[98pacecar]

Let me repeat this part,,, from an earlier post;



So this common problem is it just an annoyance, a false reading?

Nothing to worry bout? (sounds like that)

Errrr should I address it, to prevent possible,,,, damage to the motor.



As I really would,,,,, like to have it,,,, answered...

Thanks,,, Jim

[Tundra]

 No worries, what Indybobm says... pull your left side cover and replace this part. Replace it and it should take care your light/indicator problem. I had the same problem and tackled mine without the help/guidance of some of the good people here and it cost me much time frustration and money. I pulled my radiator and checked, flushed it. I changed my thermostat neither was needed. Still had the same problem and changed my sensors, which was not needed either, same problem. Then I posted here and received the same information indybobm has provided you. Once you have the part in hand, it's less than a 60 second part change and you will have peace of mind you will not overheat/damage your to you Valkyrie.

[98pacecar]

Thanks all... 

Ordered, as well as 4 of the lil black ties that hold da wires ta da bars.

A few of mine had seen,,,,,,,,,,, bedda days...