Question about 1988 Saab 900

4 Answers

Radiator fan doesn't always turn on when engine gets hot

My Saab 900s , radiator cooling fan does not alway turn on when engine temp gets hot

Posted by on

4 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Sniper:

    An expert who has posted more than 50 answers, of which 90% or more were rated as helpful.

    Governor:

    An expert whose answer got voted for 20 times.

  • Expert
  • 51 Answers

Check fuses #25 and #6 (both 30 amp)
the fan thermostat is on the left side of the rad.
turn the ignition on, and after pulling back the boot, short across the two terminal with a screwdriver.

if the fan runs, fan and wiring are both good.

if it only runs when thermoswitch is shorted like this, switch needs to be replaced (get the low temp switch to prevent overheating - your temp gauge will not go over the middle position even on the hottest days; also get a low temp thermostat,and ALWAYS get a Saab stat, not an after market!)

if the fan doesn't run when switch is shorted, check for valtage between green wire and ground at the switch.

Voltage indicates faulty fan, if no voltage then check the fan relay J in the main fuse box.

Saabreur

Posted on May 30, 2009

  • saabreur
    saabreur May 30, 2009

    PS If you Saab is a 1989 to 1993, also check relay G - it's the rad fan, J is for the A/C rad fan



    Saabreur

×

  • Level 1:

    An expert who has achieved level 1.

    Hot-Shot:

    An expert who has answered 20 questions.

    Corporal:

    An expert that has over 10 points.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 41 Answers

You need a new heat sensor. It should be on the radiator at the end of a wire from the motor fan, Ask someone at a do it yourself parts place about the part and have them print out how to install it. Or better yet, buy a repair manual for about 15 bucks and it will tell you exactly how to do it, where the part is, etc.

bob

Posted on May 28, 2009

  • Level 2:

    An expert who has achieved level 2 by getting 100 points

    MVP:

    An expert that got 5 achievements.

    Vice President:

    An expert whose answer got voted for 100 times.

    Sergeant:

    An expert that has over 500 points.

  • Expert
  • 293 Answers

Try to replace the fan relay. If this will not work, replace the temperature sensor that goes with the relay.

Posted on May 28, 2009

  • Level 1:

    An expert who has achieved level 1.

    Corporal:

    An expert that has over 10 points.

    Mayor:

    An expert whose answer got voted for 2 times.

    Problem Solver:

    An expert who has answered 5 questions.

  • Contributor
  • 8 Answers

U might want to put it on swith it easy,r than u think. look how easy 2 wires of fan make 1 go to battery run 1 in to the car where u want to put it run 1 more wire from black on battery to in side ur car with the 1 u put in ur car befor an run them to switch it dont madder how u wire it up if u wire up not right the fan wiil spin air off motor but if u do it correct it will push air on the motor hope this helps u

Posted on May 28, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

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

Hi,
a 6ya expert can help you resolve that 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.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

My 97 hyundai Accent I can drive it 100 miles and electric cooling fan doesn't come on ,doesn't get hot


Not necessarily. The vehicle, in motion, has enough air flow through the radiator that the fan is usually not needed. The fan will run if the vehicle sits and idles for a while and the coolant temp rises since there is no air flow through the radiator. If you are worried about fan operation, there are two things to check. The fans will ALWAYS come on if the A/C is turned on. That is because the fans pll air through the A/C coil in front of the radiator. Air must flow through that at all times or pressure in the A/C lines will get too high. So test that circuit simply by running the engine and turning on the A/C. If the fans run, that part works. Now turn the A/C off. Let the engine run until the temp gauge gets to around 200-220 degrees F. The fan should come on about this time and run until the temp drops to about 190. This cycle will continue to keep the coolant from getting too hot. If the temp gauge gets into the red area and the fan has not come on, shut down the vehicle immediately to prevent engine overheating, and then troubleshoot that portion of the fan circuit.

Oct 23, 2015 | Hyundai Cars & Trucks

Tip

How to keep your car below boiling poimt. ALL CARS!!!


most times in the heat your cars cooling system can over load, to stop overheating, always check your vehicles radiator water never the overflow resevoir.

always make sure your top radiator hose is hot, when running and your thermo fans come on automatically when on average heat temp. (half way).

make sure you cannot hear any noises ( clunking, grinding etc) from the waterpump, and always make sure you dont see water leaking from the vehicle ( except when air con is on).

if you do spring a leak always get it repaired ASAP as delay may further damge your cooling system, eg, head gasket and or head, effects may be warped, bent or cracked cylinder head.

always check your radiator and top up if needed at least ONCE A WEEK to avoid damage. and keep your overflow resevoir kept on the correct level.

cooling system failure can produce a big effect on your engines running capability and also your wallet!!!!!

keep your car cool in the heat!!

and also note, coolant or anti freeze does not keep your car cool, it is a corrosion inhibitor and only prevents corrosion and muck in and around your cooling system, your thermo fans keep your car cool!!!!

on Dec 04, 2009 | Acura CL Cars & Trucks

1 Answer

My engine in my 04 Sebring is running hot, andthe a/c is blowing hot air. Doesn't happen everyday. What's wrong?


Your A/C has it's own little radiator that sits right in front of your engine's water-filled radiator. Heat from your engine radiator is prolly transferring itself into the other smaller radiator and over-whelming it. When any engine is running hot, it usually turns out to be a bad themostat, bad temp-sensors (that run your electric cooling fans on the radiator (or one (or both) radiator fans have died). I would start with the thermostat since it's the cheapest....

Aug 08, 2011 | 2004 Chrysler Sebring

4 Answers

I have a 2003 subaru outback 2.5 have had head gaskets replaced, new raditor, replaced thermostate, heat gauge still shows it getting hot UNLESS I turn on the heater fan, doesn't matter where temp is set...


Terry, what's happening, is when you turn your heater on, no matter what temp you have it set at, the vehicle allows coolant to pass through your heater core, and the blower motor acts as another cooling device for the anti-freeze. The next steps I would take, is to check your fans. Let the vehicle warm up a bit, and look under the hood and see if they are turning on at all. If they are, next, you may need to flush your entire cooling system. First start with the radiator, and if that does not help, you may need to flush the entire system, which flushes water jackets throughout the engine, AND the radiator at the same time. Now, if you are not seeing bubbles, (check under the radiator cap also), I would doubt it is a crack anywhere. Take the first steps I gave you, and see if this fixes the problem. Hope it helped you out.

Feb 26, 2011 | 2003 Subaru Outback

1 Answer

Temp gauze indicates engine running hot (not always happening) can move up to very hot....have radiator flushed and new thermostat-(8 month ago).two weeks ago two new cooling fans...mechanic cant find the...


Check and see if your fans are coming ON. and also, see if there is a lot of junk such as dead bugs and **** stuck in the condenser and radiator. Let me know if this works out.

Good luck!

Dec 02, 2010 | 1999 Honda CR-V

1 Answer

The radiator cooling fan is always on ?


Is your AC on (AC compressor activated)? Try switching that off and see if it still runs.

Feb 24, 2010 | 1995 Toyota Camry

1 Answer

Where is the thermostat in a 900s oh. 97 saab 900S Well my car was overheating and I notice in this model car if you need your oil changed it will overheat. So there is oil and all my fluids are full...


Oil change interval has nothing to do with operating temperature. If your coolant is full, feel the upper radiator hose, when the vehicle is up to temp. if cool , thermostat is back from that hose,

Look for air bleeds, and read owners manual, some cars have coolant bleeds. Also, heater on high when filling coolant or risk bubbles...

My thought is that your fans may not be kicking in. They should cycle on and keep temp low enough. test them.

Sep 15, 2009 | 1997 Saab 900

2 Answers

How do i replace a radiator


  1. Drain the engine coolant.
  2. On Canadian models, disconnect the relay block that controls the day time running lights.
  3. Detach the upper radiator hose.
  4. Remove the lower radiator hose from the water outlet pipe.
  5. On vehicles with an automatic transmission, remove the transmission oil cooler hoses from the cooler pipe.
  6. Detach the cooling fan connectors.
  7. Remove the Engine Coolant Temperature (ECT) switch connector.
  8. To remove the radiator cooling fans, detach the 2 bolts and 2 upper supports.
  9. Lift out the radiator and remove the radiator/cooling fans(s) assembly.
  10. Remove the lower supports.
  11. Remove the oil cooler hoses from the radiator.
  12. Remove the lower radiator hoses from the radiator if they are still attached.
  13. Remove the No.1 ECT switch.
  14. Detach the cooling fans from the radiator.
Remember, SAFETY FIRST...never open, service, or drain radiator when hot. Serious burns or injury can occur. Always drain coolant into a sealable container. Cats and dogs are attracted to coolant and can be fatal to them if consumed. Coolant should be re-used unless it's contaminated or several years old.
Sure hope this helps you and good luck.

Jul 19, 2009 | 1998 Toyota Camry

1 Answer

1994 Saab 900 S convertible running hot


You don't say whether your electric fans both work...

First, check fuses #25 and #6 (both 30 amp)

There is a fan thermoswitch is on the left side of the rad. Turn the ignition on, and after pulling back the boot, short across the two terminals with a screwdriver.

If the fan runs, fan and wiring are both good, but thermoswitch might be faulty.

If fan only runs when thermoswitch is shorted like this, switch needs to be replaced (I strongly recommend that you get the low temp switch to prevent overheating - your temp gauge will not go over the middle position even on the hottest days; also get a low temp thermostat,and ALWAYS get a Saab stat, not an after market one! The SAAB stats are three position, and most after market ones aren't)

if the fan doesn't run when switch is shorted, check for voltage between green wire and ground at the switch.

Voltage indicates faulty fan, if no voltage then check the fan relay J in the main fuse box for the A/C rad fan, and also check relay G - it's for the rad fan.

Hope this helps!

Saabreur

Jun 22, 2009 | 1994 Saab 9 3

1 Answer

1994 Hyundai Excel Air conditioning RADIATOR´S FAN works always very fast


this not really a problem as the fan speed is controlled by the high preasure switch in the ac system the hotter it is outside the higher the preassure will be in the system as hot as its been the preasure is high already when the compressor cycles it pulls suction on one side and outputs high preasure on the other the fans cool the condenser the higher the ambient temp the faster they go so all is fine...

Jun 08, 2008 | 1994 Hyundai Excel

Not finding what you are looking for?
Cars & Trucks Logo

1,613 people viewed this question

Ask a Question

Usually answered in minutes!

Top Saab Experts

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

yadayada
yadayada

Level 3 Expert

75051 Answers

rgbypoet

Level 2 Expert

166 Answers

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

Answer questions

Manuals & User Guides

Loading...