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#1625893 - 10/10/2018 13:12 The matter with Water-Oil temp gauges low reading
kkprince Offline
Newbie

Registered: 01/10/2018
Posts: 3
Loc: Bergamo
During the life of my 1.8 April 96 I often encountered
a low reading on water and oil gauges.
(This since 2008 circa)

Typically 70 celsius... and no way to get any higher reading
even in a hot italian August max values was 80.

Because of this the Mecca changed the thermostat twice.

No difference... Mecca told me ...1.8 is a cold motor...
You know..

(?????) (WTFK???)

Then finally in the era of Multiecuscan I discovered that
the sensor for the ECU was reading 90 celsius (perfect value)
despite the fact the temp gauge was still reporting 70.

So I changed the water gauge temp sensor ......

NO WAY... same result...

So I suspect the gauges instruments after 22 got cooked...


For solving the problem .. apart replacing the instrument dash
You need to buy a sensor with a lower ohm temperature curve...
..........Or like I did ........put a 470 ohm
resistor in parallel to the ground and the signal on
the gauge connector (Both for oil and water).

Easy fix..... with an expense of less than 1 euro..
:-)

Cheers

KK



Edited by kkprince (10/10/2018 13:59)

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#1625929 - 11/10/2018 11:14 Re: The matter with Water-Oil temp gauges low reading [Re: kkprince]
dante giacosa Offline
My life on the forum

Registered: 25/05/2012
Posts: 1912
Loc: Going North on the A9
crikey-

so; you shifted the impedance of the sensors by going across them with resistors..?

okay!

Good effort for 1 euro..

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#1625938 - 11/10/2018 13:36 Re: The matter with Water-Oil temp gauges low reading [Re: dante giacosa]
kkprince Offline
Newbie

Registered: 01/10/2018
Posts: 3
Loc: Bergamo
Yep
Of course not ideal solution as replace the gauges.
But does work.
And is stable.
The min parallel resistance allowed is the one that
IS NOT raising the indicator from his rest position
when the engine is cold.

Sometimes happen the ground of instrument dashboard is NOT
zero ohm if compared to the chassis and this may cause
wrong reading @ high temperature where the sensor goes
very low , below 100 ohm.. but was not my scenario.
KK


Edited by kkprince (11/10/2018 13:46)

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#1626204 - 21/10/2018 08:32 Re: The matter with Water-Oil temp gauges low reading [Re: kkprince]
Forth Offline
Newbie

Registered: 18/10/2018
Posts: 2
Loc: New Zealand
I have the same issue, and I'm kind of glad I'm not the only one.

Both the water and oil temp gauges read low, and with the water sitting just over 70c most of the time.

The thermostat is new (and not a cheap one), the bottom radiator hose stays cold until ~70c on the dash gauge (so thermostat is not stuck open), then the fans come on at ~82c (which I assume would be 95ish on a properly working gauge?).

Gauge repair is way down the list, after fixing the oil leak from the filter housing, the leaking cam cover gasket (including cracked corner mount), the CHOD, the seeping heater matrix seals etc etc!

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#1626229 - 22/10/2018 16:28 Re: The matter with Water-Oil temp gauges low reading [Re: kkprince]
dante giacosa Offline
My life on the forum

Registered: 25/05/2012
Posts: 1912
Loc: Going North on the A9
what you driving, Forth?

welcome along!

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#1626246 - 23/10/2018 06:25 Re: The matter with Water-Oil temp gauges low reading [Re: kkprince]
Dorian Offline
Reaping the fruits

Registered: 01/05/2017
Posts: 58
Loc: Croatia
Same issue on my 2.0 16v N/A. Both the reading of oil and water temps are low, in normal driving gauges stay at around 70-80,with oil temp a bit higher,upon spirited driving or when I get into trafic,temps will rise to around 85c,90c when I am going uphill on a road with lots of curves.I think the fan kicks in at around 80-85c for me. Not sure is that a thermostat or gauge issue since N/A only has heat exchanger for the oil,not oil cooler.

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#1626265 - 23/10/2018 19:23 Re: The matter with Water-Oil temp gauges low reading [Re: kkprince]
barnacle Offline
Club Member 18 - Minister without Portfolio
Forum Demigod

Registered: 17/12/2005
Posts: 31955
Loc: Hemel in the Hempstead
This has been the behaviour of my 16NA for the last twenty-odd years...

The normal running temperature of the engine water - as measured by the ECU - is 79-84C on the 16NA.
_________________________

Don't get no respect! Coupe Fiat 1994-2000 - an owner's guide <-- clicky!

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#1626352 - 26/10/2018 09:10 Re: The matter with Water-Oil temp gauges low reading [Re: dante giacosa]
Forth Offline
Newbie

Registered: 18/10/2018
Posts: 2
Loc: New Zealand
Originally Posted By dante giacosa
what you driving, Forth?

welcome along!


Thanks, I've got a '97 20VT

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#1626353 - 26/10/2018 10:13 Re: The matter with Water-Oil temp gauges low reading [Re: Forth]
Edinburgh Offline
Club Board member
I AM a Coop

Registered: 04/03/2007
Posts: 10286
Loc: Auld Reekie
Originally Posted By Forth
Originally Posted By dante giacosa
what you driving, Forth?

welcome along!


Thanks, I've got a '97 20VT


Hi Forth and welcome to the forum smile

If you click on My Stuff/Edit Profile and scroll to the bottom you'll be able to add the relevant colour avatar to your forum name so that people will know which model you have when answering questions.... smile
_________________________


So there, Photobucket...

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