Technical coolant sensor 1992 1.9td

[rugchucker]

Rain has stopped play:bang:

 

[oscillator]

Hi Des Just wondering any luck wiv ur van?
Going to take mine to the garage tomo & see if they can shine a light on it!!
i have noticed there is two fans for the radiator but only 1 works !
Do they both suppose to work together or separate?
how is urs set up?

J

 

[rugchucker]

Hi,
Had to work today so no progress, the fans operate at separate temps so most times only one fan should operate. The one nearest the hoses I believe cuts in at 88 degrees and out when it drops to 83. The other is at about 95 degrees.
I'm pretty confident that this flush will fix it, after Sundays efforts. There's confidence for you!!!!

 

[rugchucker]

:bang::bang::bang::bang:
As you can guess that my efforts so far have made no difference, so its order a waterpump time.

This will have to wait till next week

 

[oscillator]

Hi Des
Sods law as they say mate! i took mine to the garage and explained the full symptoms to the young mechanic told him what i done what is now wrong! same as you i think and i left it with him on a compression check! got back to me said he couldn't do one as the kit or something didnt fit my type of engine!!:bang:
anyway he said he noticed a very small leak from the bottom radiator hose and he sorted that! said the waterpump seems ok but cant tell unless he took it off In that case would cost money and i would have to replace a new one then!! he did do the gasket test again and said there was no gasses showing in the expansion tank!! but on the last note of realy not getting anywhere he did say could be a small crack in the head and matbe that is why this slight overheat is the problem!! Lol :bang::bang::bang:
So there you have it none the bloody wiser !!
i shall try some other mechanic & see if i get better elsewhere ! Not happy !
keep . posting des as i would like us both to sort this problem out!
TT .

 

[rugchucker]

Hi J
I am now at the point where I am having a new pump fitted.
As I have the joys of tennis elbow, my ability to do it myself is limited.
So its to the garage and hope they do a good job:worship:

Its booked in for next Thursday so I will update you then

Have a great weekend everyone:spam:

Des

 

[oscillator]

Hi J
I am now at the point where I am having a new pump fitted.
As I have the joys of tennis elbow, my ability to do it myself is limited.
So its to the garage and hope they do a good job:worship:

Its booked in for next Thursday so I will update you then

Have a great weekend everyone:spam:

Des

Hi Des Fairplay mate sometimes its better to get someone else to do the job rather than the hassle it can be sometimes!
got my fingers crossed it all gos well and bloody fixes this problem!
Keep us updated mate
TT J

 

[rugchucker]

For those patient enough to stay with me on this problem, I think we have a result!!!!

Finally after everything has been changed, it was still showing overheating

BUT thats not the end of the story. This morning I decided to check the pipe that runs at the back of the engine, the only bit not changed, I removed the hoses from the thermostat housing to allow access and probed it with a plastic hose pipe and it was clear. So more splinters from head-scratching, then I thought lets check the new thermostat:idea: As I still had the old one I thought lets heat both up and compare the results. They both opened at the correct temperature, but, there's always a but, the new one only opened a bit, while the original opened fully, so I refitted the original and now once warmed up the flow through the bottom hose can be felt and the temperature is more in the normal zone.

SO .. What was causing the overheating, the radiator? the pump?
Who knows!!! Maybe both??
:bang: :tempt:
This education has cost me £66 for the radiator £21 for the thermostat and £397 for the pump ( done at my local garage) 4 hours labour & £135 + vat for the pump itself.:doh:

Des

 

[tidewatcher]

Going through the same process with mine. My theory (?) is that if the radiator is slightly blocked and/or the thermostat restricts flow or opens at too high a temperature the hot engine water circulates via the small hose which goes from the oil cooler to the bottom hose. This gets quite hot and possibly sets up a thermal block, ie the hot water tries to go the wrong way along the bottom hose thus stopping the normal circulation in the radiator. this would account for the cool bottom hose but hot engine. Any comments on this theory? Anyway changing radiator and thermostat (will test first!) and then checking all hoses.

 

[oscillator]

For those patient enough to stay with me on this problem, I think we have a result!!!!

Finally after everything has been changed, it was still showing overheating

BUT thats not the end of the story. This morning I decided to check the pipe that runs at the back of the engine, the only bit not changed, I removed the hoses from the thermostat housing to allow access and probed it with a plastic hose pipe and it was clear. So more splinters from head-scratching, then I thought lets check the new thermostat:idea: As I still had the old one I thought lets heat both up and compare the results. They both opened at the correct temperature, but, there's always a but, the new one only opened a bit, while the original opened fully, so I refitted the original and now once warmed up the flow through the bottom hose can be felt and the temperature is more in the normal zone.

SO .. What was causing the overheating, the radiator? the pump?
Who knows!!! Maybe both??
:bang: :tempt:
This education has cost me £66 for the radiator £21 for the thermostat and £397 for the pump ( done at my local garage) 4 hours labour & £135 + vat for the pump itself.:doh:

Des

Hi there been some time!
Did you manage to get the overheating sorted? was it the waterpump>? or are you still banging ur head?
i am still the same wiv mine and getting the funds together for a new pump!
i belive the waterpump is separate from the cambelt?
i

 

[tidewatcher]

OK, new radiator fitted, took the old one apart and the condition would not cause overheating. New thermostat fitted and tested first, although the old one appeared to be OK. New temperature sensor fitted, one mine there are two wires to the sensor, one is a thermister which operates the temperature gauge and the other must a "switch" type sensor which operates the red light. The thing is as they are in the same place they must both be sensing the same temperature which begs the question why my temperature gauge was reading ok but the red light came on?

About to refill with coolant fluid and give it a try, will let you know what happens.

Would really like to know if rugchucker actually did cure the problem with just the thermostat.

 

[mpallaruelo]

Well, I have changed the sensor & the thermostat, the top hose is hot, the bottom hose is cooler and the gauge is still reading hot, it seems to wander about a bit???

Any ideas??

Hello, excuse me, I know that it is a very old message but I am desperate. My 1990 fiat ducato 1.9 td suffers from exactly the same problem.

I have reviewed all the forums in Spanish that I know and I have never read a message about a problem so similar to mine.

I have changed all the parts: cylinder head gasket, radiator (for a bigger one), thermostat, water pump etc.

I have detected the same problem, the return tube is cool (the fans do not turn on) but the motor temperature is still 100 ºC.

I don't know what to do, do we know if it solved your problem?

Thank you all very much and greetings from Spain.:worship::worship:

 

[Communicator]

mpallaruelo,

An erratic temperature gauge may be due to a bad connection, either at the sensor, or the gauge. If your fuel gauge is also erratic, you may find the following thread on the Motorhome Owners Organisation (MHO) interesting.

https://www.motorhomeowners.org/post...ingfix-6882130

 

[mpallaruelo]

Thank you very much for the help. After all the possible mechanical changes now I am focused on checking the electrical part.
I will inform you of the final result and upload photos.