Thermostat/ temperature

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B

bakers

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Got a 300TDI defender, it’s always run a bit cool to the point the heater isn’t hot, gauge shows about 1/4.

Decided to change thermostat see if any improvement, put in a 88 degree and now the gauge is almost at top of black, but not ‘boiling’

Original was a Waxstat.
Put them both in a pan and the waxstat opens at a lot lower temperature than the new one.

Is the new gauge temp too high and do waxstats open at lower temperature than the 88 degree ones.Not altered anything else.

Steve
 

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Isn't that about right if the engine is hot?
You need to test the coolant temp with one of them hand held temperature gun thingies. If all OK then all you need to do is keep that temp position as normal running temp.
My son's 200tdi did exactly the same thing after fitting a new thermostat except it sits even higher. It's doesn't over heat, proven with a secondary gauge .
 
Your pictures match what my garage does and I was a little concerned it was getting too hot. But I also have an 88 stat fitted. I would have expected the gauge to sit at about halfway but sits where yours is. But even towing doesn’t really move above that. So maybe that is just the right point for the higher temp stat.
 
The modern made stats are often rubbish. Last year I had 3 replacements when original failed after many years.
Number 1 did not work at all, 2 packed up after a month. Number 3 a new in the box original Waxstat still fine.
If you want to know your actual temp fit an after market capillary gauge that reads in numbers/degrees.
 
dag019 said:
Your pictures match what my garage does and I was a little concerned it was getting too hot. But I also have an 88 stat fitted. I would have expected the gauge to sit at about halfway but sits where yours is. But even towing doesn’t really move above that. So maybe that is just the right point for the higher temp stat.
Click to expand...
Hopefully that’s it, will measure with laser and then if looks about right will leave it.
 
The heater wouldn't get hot in my 300.

I pulled the stat core and put it in a pan - it would open at far too cool a temperature.

I replaced the core with whatever britpart one was going at the time, and my heater worked fine again.
 
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