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PostPosted: Tue Nov 16, 2021 6:47 pm 
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Light Pressure Turbo

Joined: Mon Jun 22, 2015 7:17 pm
Posts: 388
Location: Peterborough
Car Models: Saab 9000 Anni
Hi, the temp gauge on my 9000 used to sit happily at around the 8.30 position when running. Now it barely makes it to half that distance. Before I go diving in to change the thermostat, what engine temperature should it be running at when normally running? I can put my clone Tech 2 on it to check, but don't know what value I should be looking for to differentiate between a gauge issue vs a fully open 'stat. Thanks


Last edited by EmpingSaab on Sat Nov 27, 2021 12:35 pm, edited 1 time in total.

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PostPosted: Tue Nov 16, 2021 7:06 pm 
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UKS Addict
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Joined: Sat Mar 14, 2009 12:28 am
Posts: 4689
Location: South Wales
Car Models: 900 SE Stage 3
The thermostat should open at 89 Celsius. Left to idle for a bit once up to temperature, my B204L 900 hovers between 90-105 degrees. Water temp below is in the bottom left corner.
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Homebrew Stage 3 - No longer nobbled by heatplates


Last edited by Kei on Wed Nov 17, 2021 3:12 pm, edited 2 times in total.

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PostPosted: Wed Nov 17, 2021 3:46 am 
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Active user

Joined: Sun Aug 29, 2021 2:31 pm
Posts: 73
Car Models: 9000
Remove the Stat and place it in a saucepan of water on your stove.
Use your wife's Oven/kitchen thermometer to read water temps and watch carefully to see exactly when it opens up And when it closes.
I've found that stats vary widely between their stated temps and their real life operation (even brand New)
French made ones seem more consistent.. in my experimentations.
IMO an 82 C stat is Plenty hot enough... unless in arctic conditions.
Spare me though.


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PostPosted: Wed Nov 17, 2021 12:19 pm 
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Light Pressure Turbo

Joined: Mon Jun 22, 2015 7:17 pm
Posts: 388
Location: Peterborough
Car Models: Saab 9000 Anni
Thanks Guys, will give it a go.

Update: Engine temp between 85 to 95 deg. Gauge staying welded down in the bottom quarter of display. Would I be right to suspect this is simply a binnacle temp gauge issue? Thanks


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PostPosted: Wed Nov 17, 2021 2:32 pm 
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Joined: Sun Jan 26, 2014 9:41 am
Posts: 5691
Location: Royal Tunbridge Wells
Car Models: '03 9-5 2.3 Vector Auto Estate Noob Stg 1, Suzuki S Cross, '81 TR7 DHC
Could be the temp sender in the head, probably more likely than the binnacle gauge on a 9k. IIRC the one in the end of the head near the thermostat is the one which drives the gauge.

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Alan

'03 9-5 2.3t Vector Estate Noob Stg 1
'01 9-3 2.0t SE Vert
'81 Triumph TR7
Suzuki SX4 S Cross


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PostPosted: Wed Nov 17, 2021 5:43 pm 
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Joined: Thu Sep 01, 2005 5:31 am
Posts: 6246
Location: Bucks
Car Models: Saab NG 9-5 Aero
TWSaab wrote:
Could be the temp sender in the head, probably more likely than the binnacle gauge on a 9k. IIRC the one in the end of the head near the thermostat is the one which drives the gauge.

You do remember correctly, it is very likely to be the transmitter. However on one of my 9000s I changed both thermostat and transmitter for this problem and it still read low. I changed the car and the problem went away.


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PostPosted: Wed Nov 17, 2021 5:51 pm 
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Light Pressure Turbo

Joined: Mon Jun 22, 2015 7:17 pm
Posts: 388
Location: Peterborough
Car Models: Saab 9000 Anni
Thanks. I'll have a look at the transmitter. Anyone know what it's resistance values vs temp should be? I'm guessing it is the one on the side of the cylinder head near where the matrix hoses come out?


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PostPosted: Wed Nov 17, 2021 8:38 pm 
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Joined: Sat Mar 14, 2009 12:28 am
Posts: 4689
Location: South Wales
Car Models: 900 SE Stage 3
EmpingSaab wrote:
Thanks. I'll have a look at the transmitter. Anyone know what it's resistance values vs temp should be? I'm guessing it is the one on the side of the cylinder head near where the matrix hoses come out?

Yes, I think that one drives both the gauge and the radiator fan. The other is in the inlet manifold which I think is what provides the data to the ECU.

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Homebrew Stage 3 - No longer nobbled by heatplates


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PostPosted: Thu Nov 18, 2021 1:21 pm 
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Light Pressure Turbo

Joined: Mon Jun 22, 2015 7:17 pm
Posts: 388
Location: Peterborough
Car Models: Saab 9000 Anni
Thanks. Thought it might be that one. Will have a look at finding a replacement


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PostPosted: Thu Nov 25, 2021 4:41 pm 
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Light Pressure Turbo

Joined: Mon Jun 22, 2015 7:17 pm
Posts: 388
Location: Peterborough
Car Models: Saab 9000 Anni
Changed the thermostat (saab original part) and the temp sender, and still reading low. Binnacle out next and clean the contacts... Failing that I'll just have to put up with it!


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PostPosted: Fri Nov 26, 2021 8:12 am 
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Joined: Sun Oct 15, 2006 7:02 pm
Posts: 8791
Location: Reading, Saabshire.
Car Models: enquiries@thesaabclinic.co.uk
EmpingSaab wrote:
Hi, the temp gauge on my 9000 used to sit happily at around the 8.30 position when running. Now it barely makes it to half that distance. Before I go diving in to change the thermostat, what engine temperature should it be running at when normally running? I can put my clone Tech 2 on it to check, but don't know what value I should be looking for to differentiate between a gauge issue vs a fully open 'stat. Thanks


On my weekly 800 mile commutes, Trionic5 on my car reports 88c all day long. On the Dash gauge i would say its position would be equal to 8.30. So not quite at the 9 oClock position.
Back in the summer on hot days stuck in London traffic with the AC on. I think i saw 94c occasionally.

Im watching live data every day, inc live Timing, Fuel Trims etc. Due to the fact im doing continual Mapping development.

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The SAAB Clinic. www.thesaabclinic.co.uk
92 9000 CSE *B234R incoming!
97 9000 Aero 2.3T TSC Stg3


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PostPosted: Sat Nov 27, 2021 12:41 pm 
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Light Pressure Turbo

Joined: Mon Jun 22, 2015 7:17 pm
Posts: 388
Location: Peterborough
Car Models: Saab 9000 Anni
Thanks for the advice everyone. In the end, it was the binnacle. (I changed the thermostat and temp sensor previously trying to hunt down the culprit).
For the knowledge base: Symptom was the temp needle hovering just off the blue sector, and occasionally being a bit erratic (jumping up or down a small amount - but still reading low).
Solution (in my case): Reflow solder on connections within temp/fuel gauge unit.
The binnacle dismantles easily. It is very modular (good old Saab!). Four (maybe 5?) torx screws to remove EDU, 4 screws to remove speedo unit. 2 screws to remove temp/fuel unit. Then around 6 small screws to separate temp/fuel unit display from its back-plate. Then reflow solder on all connections. Reassemble. It now behaves normally!


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