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The matter with Water-Oil temp gauges low reading #1625893
10/10/2018 11:12
10/10/2018 11:12
Joined: Oct 2018
Posts: 3
Bergamo
K
kkprince Offline OP
Newbie
kkprince  Offline OP
Newbie
K

Joined: Oct 2018
Posts: 3
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


Last edited by kkprince; 10/10/2018 11:59.
Re: The matter with Water-Oil temp gauges low reading [Re: kkprince] #1625929
11/10/2018 09:14
11/10/2018 09:14
Joined: May 2012
Posts: 1,912
Going North on the A9
dante giacosa Offline
My life on the forum
dante giacosa  Offline
My life on the forum

Joined: May 2012
Posts: 1,912
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..

Re: The matter with Water-Oil temp gauges low reading [Re: dante giacosa] #1625938
11/10/2018 11:36
11/10/2018 11:36
Joined: Oct 2018
Posts: 3
Bergamo
K
kkprince Offline OP
Newbie
kkprince  Offline OP
Newbie
K

Joined: Oct 2018
Posts: 3
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

Last edited by kkprince; 11/10/2018 11:46.
Re: The matter with Water-Oil temp gauges low reading [Re: kkprince] #1626204
21/10/2018 06:32
21/10/2018 06:32
Joined: Oct 2018
Posts: 2
New Zealand
Forth Offline
Newbie
Forth  Offline
Newbie

Joined: Oct 2018
Posts: 2
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!

Re: The matter with Water-Oil temp gauges low reading [Re: kkprince] #1626229
22/10/2018 14:28
22/10/2018 14:28
Joined: May 2012
Posts: 1,912
Going North on the A9
dante giacosa Offline
My life on the forum
dante giacosa  Offline
My life on the forum

Joined: May 2012
Posts: 1,912
Going North on the A9
what you driving, Forth?

welcome along!

Re: The matter with Water-Oil temp gauges low reading [Re: kkprince] #1626246
23/10/2018 04:25
23/10/2018 04:25
Joined: May 2017
Posts: 86
Vinisce
D
Dorian Offline
Reaping the fruits
Dorian  Offline
Reaping the fruits
D

Joined: May 2017
Posts: 86
Vinisce
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.

Re: The matter with Water-Oil temp gauges low reading [Re: kkprince] #1626265
23/10/2018 17:23
23/10/2018 17:23
Joined: Dec 2005
Posts: 32,152
Hemel in the Hempstead
barnacle Offline
Club Member 18 - Minister without Portfolio
barnacle  Offline
Club Member 18 - Minister without Portfolio
Forum Demigod

Joined: Dec 2005
Posts: 32,152
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!
Re: The matter with Water-Oil temp gauges low reading [Re: dante giacosa] #1626352
26/10/2018 07:10
26/10/2018 07:10
Joined: Oct 2018
Posts: 2
New Zealand
Forth Offline
Newbie
Forth  Offline
Newbie

Joined: Oct 2018
Posts: 2
New Zealand
Originally Posted By dante giacosa
what you driving, Forth?

welcome along!


Thanks, I've got a '97 20VT

Re: The matter with Water-Oil temp gauges low reading [Re: Forth] #1626353
26/10/2018 08:13
26/10/2018 08:13
Joined: Mar 2007
Posts: 10,643
Auld Reekie
Edinburgh Offline
Club Board member
Edinburgh  Offline
Club Board member
I AM a Coop

Joined: Mar 2007
Posts: 10,643
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


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