Testing Td5 Thermostat off the vehicle

tom1979 · Aug 16, 2021

I recently changed my thermostat and want to check the old one. It's not as easy as a conventional thermostat as you can't see inside so easily, so I poured boiling water into the end expecting it to open the thermostat and allow it to flow through, but it didn't so I'm not sure now if it was faulty or if I'm doing it wrong. Any recommendations on the best way to do it?

Pics below, I poured the water in the top

steve2286w · Aug 16, 2021

Never seen that type before , but it probably needs to soak at temp rather than just pout boiling water over

I would test by blowing at room temp first, then
You will need a thermometer of course pop them both in pan and bring up to the various stage temp allowing a few extra degrees to allow for cooling when you pull it out then blow through the same rad pipe connection and see where air comes out and make notes as you go , other way if you don’t have asbestos lips is to add a pipe onto rad connection so it’s out of water and cooler and when blowing see what pipes bubbles come out

marjon · Aug 16, 2021

Turn it over and pour it in the other end.

J

KISSMYAURA · Aug 16, 2021

tom1979 said:
I recently changed my thermostat and want to check the old one. It's not as easy as a conventional thermostat as you can't see inside so easily, so I poured boiling water into the end expecting it to open the thermostat and allow it to flow through, but it didn't so I'm not sure now if it was faulty or if I'm doing it wrong. Any recommendations on the best way to do it?

Pics below, I poured the water in the top

View attachment 245659 View attachment 245660 View attachment 245662

Hi tom, they are a PIA to test, my new ones been in for a few years much betterer all good now.

tom1979 · Aug 17, 2021

marjon said:
Turn it over and pour it in the other end.

J

Cold water trickles through slowly, so does hot.

Alpinejim · Aug 17, 2021

I did this with mine last week. Water slowly trickles through.
It was brown and manky so I tried it with another used one which was very clean inside and no water trickled through.
My verdict was that my original was on its way out.

Testing Td5 Thermostat off the vehicle

tom1979

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steve2286w

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marjon

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KISSMYAURA

Well-Known Member

tom1979

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Alpinejim

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