Question about 1996 Saab 900

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Cooling system not working

The cooling fans on the radiator don't come on any more but fuses are good

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Replace the fan thermoswitches and, or, relays

Posted on Nov 18, 2013

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What could cause my 93 Chevy Cavalier to overheat? I just put in a new water pump and a new thermostat but it still tends to overheat and now has a leak from the thermostat intake hose.


We need rule out a few basic things to properly diagnose the overheating problems.
Step 1:Do you think?there is enough antifreeze in the radiator? Don t just look inside the plastic overflow bottle only, you should remove the radiator cap and then look inside the radiator.We should see the fluid level whether it is at its proper level or not. Most cars and trucks will hold a mixture of coolant and water .You should have the cooling system pressure tested for a leak if you have to add more than a pint of fluid .If we see any obvious fluid loss in the engine compartment or on the ground , we should also have the system tested.
Step 2:If you don not see any coolant leak or low fluid level , then you should determine when the overheating problems occurred.If the engine overheats only at a stop or idle ,Most front wheel drive cars will use an electric cooling fan motor located in front or behind the radiator. The existence of function of the cooling fan is to improve airflow across the radiator at stops and low speeds.The fan is controlled by sensors,it regulates the engine temperature and additional load that might be placed on the engine.The cooling fan is required by the air conditioning compressor to operate at idle when the compressor is on.It is a quick way to check the cooling fan operation to turn on the air conditioner.
Also the cooling fan should come on with the air conditioner compressor. Some automobiles will have two electric fans, one is the air conditioner condenser fan and the other is for the radiator .It will have a belt driven fan blade and fan clutch if your vehicle does not have an electric cooling fan on the radiator . This fan should be pulling a large amount of warm and hot air across the radiator onto the engine to keep it cool.The radiator fan is usually closer to the middle of the radiator. The radiator fan is responsible for cooling of the engine, while the condenser fan is responsible for increasing air conditioning efficiency at idle and low speed.If there is ample airflow across the radiator at idle. The radiator is responsible for the primary heat exchange for the engine, and airflow is crucial at this time.
Step 3:Again, we have ample airflow across the radiator, so we must inspect the proper antifreeze circulation.If there is a restriction in the system , it will produce the same affect.Water calcification can accumulate in the radiator and then drastically reduce the flow of coolant at a very high speed. Removing the radiator from the vehicle are the only two real cures for a clogged radiator.It be a waste of time and money trying to correct a restricted radiator when you use a can of radiator flush additive. Of course there are more technical issues that could produce an overheating problems, but the check list described above will identify the most common.Anything you can do to help the mechanic to deal with the problem will probably result in less diagnostic charges, and it might help insure a proper diagnosis of the problem at once of your 1993 Chevrolet Cavalier.
Step 4:You must inspect an electric motor cooling fan ,it will start with ignition key switch off, it has failed and needs to be replaced if the 1993 Chevrolet Cavalier fan motor does not spin freely . The electrical system operates the fan needs to be tested,If the fan motor "freewheels" that . Start the engine and then turn the air conditioner to the coolest setting, if your automobile does not have an air conditioner skip this step.The car air conditioner will operate the 1993 Chevrolet Cavalier cooling fan should activate within five minutes , the fan motor fuse must be checked first and the fuse condition is good the remainder of the electrical system must be checked.
Step 5:A wiring schematic is needed to further troubleshoot this problem ,which is located in a repair service manual. You may use the wiring schematic to trace the circuit through the fuse and relay components, if everything of 1993 Chevrolet Cavalier tests fine, the fan motor has failed and needs to be replaced. The most common repair is the cooling fan motor failure.
This isn't only theory. You can take these steps into practice.You can deal with the 1993 Chevrolet Cavalier overheating problems yourself.

Jul 18, 2016 | Cars & Trucks

2 Answers

Coolling fans dont work


Check for a blown fuse----look at it & test it
Check for & TEST any fan relays-have to remove them to do so
Then unplug the cooling fan & put battery voltage to it

If the fuse is good,the relay works,the fan works,you may need
a wiring diagram & do some internet searching to find a temp sensor or switch--odds are it will be in the radiator or cooling system somewhere.

Check for wire connectors being off

Have to check the radiator for leaks & the coolant system
for leaks & at least partially remove the radiator, to get rid of
leaves & other road dibris,bird feathers & such

Aug 15, 2014 | Pontiac Grand Am Cars & Trucks

2 Answers

Temperature hand keeps moving up


when the engine is completely cool. first thing you need to do is check your coolant level. if it is full. then either your thermostat is bad, your cooling fans aren't working, radiator is plugged or heater core is plugged. but if the heat works and blows good and hot odds are nothing is plugged and its the cooling fans that aren't working. Worst case could be a bad head gasket

Mar 23, 2013 | 2004 Pontiac Grand Am

1 Answer

Cooling fan not working in my 2000 Dodge Durango. I checked the fuse ( its good) and replaced the cooling fan....still not spinning/working. HELP! This is my only car!


the fan have a relay, turn your AC on and check to see if it comes on your fan have 2 speed one is for temp and the other for AC.

Sep 18, 2012 | Cars & Trucks

1 Answer

Fan comes on when switch ignition on instead of when hot Tazz


If the fan not turning on when car engine getting hot,then car will notice overheating.Click this link below for troubleshooting:---http://technoanswers.blogspot.in/2012/02/car-running-hot.html--------To know how engine cooling system works ,click the link below :----Engine cooling components working?

http://repairhelpcenter.blogspot.com/2011/11/engine-cooling-components-working.html

------------------
How does Vehicles Engine cooling system works? http://repairhelpcenter.blogspot.com/2011/11/how-does-vehicles-engine-cooling-system.html
------------How to Replace Engine cooling Fan:-- http://repairhelpcenter.blogspot.com/2011/11/how-to-replace-engine-cooling-fan-on.html
-----------Replace Fan Relay but still Radiator cooling fans not working? http://schematicsdiagram.blogspot.com/2011/12/replace-fan-relay-but-still-radiator.html
----------DIC says "COOLING FAN FAULT"? http://schematicsdiagram.blogspot.com/2011/12/dic-says-cooling-fan-fault.html
---------Where Is Radiator Fan relay and Fuse Located?

http://schematicsdiagram.blogspot.com/2011/12/where-is-radiator-fan-relay-and-fuse.html

--------

This will help.

Thanks.

Feb 09, 2012 | Cars & Trucks

2 Answers

I have a 2004 Pontiac Sunfire. When the car is in idle the air blows out hot and the Temperature gage rises and the car over heats. When the car is moving the air blows out ice cold and the temperature...


Sounds like your cooling fans on the radiator are not working. The fans are activated by a thermol switch on the engine or radiator reading the coolant temperature and an A/C switch. When the coolant is too hot the fans should activate cooling the system down. And, when the A/C is on the fans should also activate in order to cool the condensate so the A/C would work.

When you are driving, the movement of the vehicle throught he air is providing enough air flow to keep things cool and functional.

I would check the radiator fan fuse or fuses first. If those are OK I would try to run the fans with 12 volts and a ground that I supply just to see if the fan motor(s) actually run when powered. If the fan don't run when powered then the fans are bad and will need to be replaced. If the fans do run when you power them manually, then something is not allowing the power to activate, like a relay, control unit, or wiring.

It will take a little diagnostics, but it is not too difficult to chase it down.

May 03, 2011 | Pontiac Sunfire Cars & Trucks

1 Answer

Radiator fan motor does not run


1. check the cooling fan fuses
2. supply battery voltage directly to the fan assembly plug
a. if fan is good
locate and test/replace cooling fan relay
b. if bad
replace cooling fan assembly
if still is not working check continuity cooling fan system circuit/wiring

Aug 19, 2010 | 1999 Nissan Quest

3 Answers

My 2002 audi a3 1.9 tdi is overheating? I have


If your cooling fan is not working you solved your own problem. The cooling fan is what helps your radiator perform its function. The radiator cools down the antifreeze mixture by separating it into small tubes separated by air fins, the fins allow a greater surface area for air. The radiators main function is to dissipate heat into the surrounding atmosphere which it can do well at highway speeds without a fan, but most modern cars need a cooling fan to help pull air across the radiator.
The wiring diagram for your vehicle suggests that there is a 5 amp fuse 4 and a 40 amp fuse 42 that run the radiator fan and control which should be located in an under hood fuse/relay box. Check them with a test light on both sides, with the light to ground you should see a positive voltage at both sides. the 40 amp would most likely be a maxi fuse, or a larger size then the regular atm fuse for the 5 amp,

Aug 26, 2009 | 2005 Audi A3

3 Answers

My radiator fan does not work under any conditions, all fuses ok, wondering which relay is it to check conditions, thanks


Here are the cooling system diagnostic steps...First does the cooling fan kick on (with engine hot)? If not, check the fuse, if good then check the thermoswitch in the radiator (it's about an inch and a half in diameter located on the lower part of the radiator with two wires ) by disconnecting the wires and touching them together (again, with engine hot...at least 190 degrees) if the fan comes on, you have a bad switch. If not connect a 10 gauge jumper wire from the battery to the fan itself (there are three terminals,,, one high, one low and ground). With power direct from the battery (and a ground wire, if necessary) fan should run... if not replace the fan assembly... if it does run then you have a bad cooling fan relay. It will be located above the fuses on the fuse block... Hope this helps...;-)

Apr 24, 2009 | 1991 Buick Century

3 Answers

Coolig fans dont run


the cooling fans are run by a relay it's located in the junction box. check this. there is also a thermoatic sensor located near the fans next to radiator. the fans should free spin when the engine is off this is a good indiacator that it's not the fan themselves. if the relay checks out(run engine and switch the fan relay with the a/c clutch relay when the engine reaches 180 degrees you will feel the upper radiator hose get hot the fans will turn on a short time later iof they don't it's the temp sensor near the radiator if they do it's a bad relay...please rate this thanks

Sep 28, 2008 | 1994 Pontiac Grand Prix

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