Question about 1999 Saab 9-5

1 Answer

Temp gauge is registering a bit low, thermostat issue

My temperature gauge has been registering a bit low for the last couple of months and the the check engine light just came on. Had on board diagnostics checked and it said there was a problem with the thermostat. Tech said it might be sticking or something. How critical is this and is it something that I can attempt to replace myself?

Posted by on

  • kaisersoze Jan 24, 2009

    Thanks for your input. How do I locate the part, is it accessible from the top of the engine compartment or do I have to climb underneath??



1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that gotĀ 5 achievements.


    An expert whose answer gotĀ voted for 20 times.


    An expert who has answered 20 questions.

  • Expert
  • 65 Answers

There not hard to change and if it sticks to long it might over heat So ya it is something you could fix yourself

Posted on Jan 24, 2009

  • Damian Lyman Jan 26, 2009

    it is on top of the engine.follow the top rad hose from the rad to the engine and there will be a thermostat housing there with 2 bolts in it.Take it off and the thermostat is under there,take old one out and clean the thermostat housing and the engine where the thermostat goes good and install the new gasket and thermostat.When i replace thermostats i use a high temp thermostat silicone with the gasket just to make sure it doesn't leak



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.

Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.

Here's a link to this great service

Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Heater not blowing hot are ,car not over heating,what could be the problem not getting heat

There are a couple of possibilities. If you have a temp gauge in the car, is it showing normal temperature when the car is fully warmed up? If not, you could have a thermostat problem. If you don't have a temp gauge, then check the temp of the upper radiator hose with the engine fully warmed up. If it is not very warn to the touch, check the thermostat. Assuming that the thermostat is not stuck wide open, and the vehicle is at normal temperature, then the most likely causes are either a stuck blend door in the heater control box, or a linkage/vacuum issue with the heater control to the control box.

Sep 30, 2015 | Cars & Trucks

1 Answer

Truck never reaches operating temperature

low operating temperatures is an indication of an air lock in the cooling system
gauges need the sender unit to be fully immersed in coolant to work but if they are not then the variable resistance material in the sender bulb cannot accurately relate to the coolant temperature
example if you have leak develop in a good system and you do not regularly scan your gauges like a good drive will do. it is possible that you will smell a dying engine yet when yo look at the gauge it will be reading cool to cold because the coolant has dropped to a point where the sender is no longer in contact with the coolant

May 21, 2015 | 1989 Ford F 150

1 Answer

What could cause the temp gauge to not register after replacing decending unit, thermostat, water pump & antifreeze?

Bad ECM, bad wire from the ECM to the instrument panel, and a bad motor for the temp gauge.

Feb 24, 2015 | 1999 Mercury Grand Marquis

1 Answer

Why does the temperature gauge on my 1995 Chevy K2500, 5.7L read 150 degrees ?

If you replaced the SENSOR and not the gauge SENDER, there's your answer.

The SENSOR sends the computer (ECM, PCM, ECU, etc.) the engine temp so it can make the adjustments to the fuel, timing etc.

The gauge SENDER makes the gauge read what temperature the engine coolant is.

Hope the helps.

Feb 21, 2015 | 1995 Chevrolet K2500

1 Answer

Honda Pilot 2003, low engine temperature, thermostat was replaced several times, still the engine temp is low.

use a termo laser to check temp of coolant at filler cap ,with cap off run vehicle till you have hot heat coming out of your heater then check with laser. if it reads above 140 then you know 2 things . either the therm sensor is going bad or the temp gauge is bad , make sure the radiator fans come on ,if they do and you have good heat then you have bad gauge.

Apr 01, 2014 | Honda Pilot Cars & Trucks

1 Answer


Could be an impeller issue giving reduced water flow.

Aug 01, 2017 | 1998 Chevrolet Lumina

2 Answers

98 Camaro LOW running temp. I just recently purchased an all original, terrific running 98 Camaro Converible with only 86000 miles on it. Everything seems great and I've been driving it for weeks with no...

I would suspect either the temp guage or the coolant temperature sensor being inaccurate. The new thermostat is probably working good, or else you wouldn't have a very warm heater. If you have electric radiator fans, you might check to see if they are running all th time. Electric cooling fans should only come on when the temperature sensor reaches a predetermined coolant temp, or when the a/c or defroster is turned on. If the fan runs all the time, the engine would not reach normal operating temperature.

Feb 27, 2011 | Chevrolet Camaro Cars & Trucks

Not finding what you are looking for?
1999 Saab 9-5 Logo

Related Topics:

316 people viewed this question

Ask a Question

Usually answered in minutes!

Top Saab Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22326 Answers


Level 3 Expert

79847 Answers

derek oliveira

Level 2 Expert

85 Answers

Are you a Saab Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides