Author Topic: Suspected water temp issue  (Read 756 times)

xsel777

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Suspected water temp issue
« on: November 30, 2015, 01:24:24 PM »
My kymco XC500EFI has this suspected problem with the water temp.

Starting from cold, and riding on freeway, temp guage stays at 0.sometimes even goes further down.
20 min on freeway it stays cold.
I come to stop/robot on off ramp, and temp goes to normal.
From then on it stays at normal,freeway or city.

If I ride around the suburbs, from cold start it also takes a long time to get to normal.

If I idle from cold start, it goes to normal after a period, but less time than when driving.

I recently swopped out the thermostat (when I noticed issue) with an old one I had from 2 years back (it came installed in the scoot when I bought it-3 years old at that time) (don't ask why I changed it then - I forget) to see if the issue would rectify itself.

The behaviour I have described above is after this recent swopout.


Before this recent swopout, the temp would go back to cold after hitting normal, if I went back on the freeway.
(this is with the now 2 year old thermostat)

So , since the behaviour changed with the thermostat changeout, it must be that right?
I also replaced the radiator cap.
Water is Clean and green.

No pirate part available for the thermostat, agents only @ ZAR850(59usd),which is seriously painful!

With radiator cap off I see the water level rise and bubbling a bit.
This must mean that the water pump is working.
In  any event the temp never goes over normal (radiator fan is working correctly, only comes on after normal is reached)
No water in oil.
No  oil in water.

It  can't be temp gauge sender unit, because it does go up eventually.

It  might be  cabling issues, but I have wiggled them while driving and did a complete rearrangement of the Cabling to the gauge sender unit.

I took off a cover to feel the pipe from the top of the thermostat to the top of the radiator while I am driving.
It gets  a bit warm, but not cooking, until I come to  a stop sign/robot and have to wait a bit.


That is all the info I can provide.

What can be the issue here?
I am trying to avoid another thermostat at ZAR850(59usd),  but if your collective wisdom says that is the issue I will bow to your superior knowledge, as my brain is hurting from trying to work this out now.

I will hear from you soon, no  doubt.



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Sent from my Samsung Note 3 with Tapatalk

2010 Kymco Xciting 500Ri-Dark Blue

CROSSBOLT

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Re: Suspected water temp issue
« Reply #1 on: November 30, 2015, 03:14:20 PM »
One way to SOLVE this is to PROVE the sender and the thermostat. That would be to put both in a pan of water along with a reliable thermometer. As you raise the water temp you should see some things happening: thermostat should open at a preset value and the sensor should change its resistance according to the schedule in the service manual. Another way is to strap a remote temp sensor near the installed sensor to see what the differences are.

I would not like to spend 59 EU or USD on the HOPES it was a bad thermostat!

Karl
Karl

Three motorcycles 1960-1977 (restored a 1955 BSA)
Agility 50
Yager 200i
Downtown 300i
Navy tech, Ships Engineer, pilot and aircraft mechanic

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