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Old 12-04-12, 12:35 PM   #1
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Join Date: Oct 2009
Posts: 29
Default 2.5TD thermostat and sensor questions


I have a motorhome based on a 1998 2.5TD chassis.
The engine is a DJ5T.
VIN VF3232G9215429315

1st question. Is there a conventional thermostat fitted to the outlet of the water pump ? The parts list shows only the black resin thermostat with 2 pipes which is fitted to the outlet tank switch probe. The part number I have identified for this thermostat is 133838. The parts diagram does show a thermostat gasket on the outlet of the water pump but does not show the thermostat.
I am confused as to whether there are 2 thermostats or just the one that I have identified.

2nd question. Alongside the thermostat that I have identified is a 'Sensor Engine' with a green body and green connector. I think the part number is probably 1920K9. What does this item do. It appears to have no effect on the temperature display or the over temperature light. When the green connector was left off I did notice that the glow plug warm up period is much extended, i.e. glow plug light stayed on for much longer.

3rd question. Moving up a little and to the right on the same assembly is either a 'sensor engine' or 'temperature switch' with a blue body and blue connector. I suspect it is a temperature switch part number 133840 as that is recorded as blue in the parts list. Again, what does this do, as it appears to neither effect the temperature gauge or over temp warning light ?

4th question. So...what controls the over temperature light on the dash ?

My reasons for asking. On a recent run at a higher speed c. 70 mph on the motorway, I noticed the temperature climbing up to around 110. After some time the red over temp indicator on the dash started to flicker. I slowed up, the flickering stopped and the temperature gauge dropped back. I am firstly sure the red light should have come on solid rather than flickering. Secondly I am happy to see if I can address the temperature issue by changing the stat but am confused as to whether there are two stats or not.
It may just be that the over temperature sensor is just too sensitive.

I have removed the connector from the fan switch on the bottom of the rad and by shorting 2 wires I can get both fans running. Fan switch is another slight suspect.

Any help appreciated.



Last edited by andytw; 13-04-12 at 10:57 PM.
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Old 13-04-12, 10:55 PM   #2
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Join Date: Oct 2009
Posts: 29


I replaced the auxilliary thermostat today. I ran the engine until hot and left it running.
The gauge went up to 105 or 100 and the boil light came on but the fans didn't cut in.
So I think the fan switch is my next mission.

I can at least now answer questions 3 and 4 above. The blue device on top of the probe assembly drives both the temperature gauge and the over temperature light. As the latter flickers and is not switched hard on I suspect it is fed from the temperature gauge behind the needle somewhere. Anyway the blue device is a sensor and not a switch.

Also, having had a closer look at the exploded diagram in the parts manual I can see that the part 'Water Pump Cover' 1336F9 looks strange. I have looked for this part on the web and can see that it contains the main thermostat. So there isn't a seperate main thermostat, it is part of the cover. Question 1 also answered.


Last edited by andytw; 14-04-12 at 08:07 AM.
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