Question about 1994 Chevrolet Camaro

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Car runs hot at an idle. turn on the air and the fan comes on and cools off . does the ect control the fan function when the air is off? 1994 camaro 3.4.

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  • ebzeminor Jun 16, 2009

    I replaced the sensor,located in the intake manafold.and the relay ,only one on this car,former one was hot to the touch as well as this one. If the fan works with the air on could the fan be faulty, only one fan, also could this be a problem with the ecm,or does another sensor have anything to do with this, in line fuse ? I am at a baffled



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The Cooling fan is Wired in in such a way so as to Automaticly Turn on Cooling Fan If the A/C is Switched ON. If "WITHOUT the A/C on" The Cooling Fan Doen NOT come ON Untill Engine. is @ 210-230 Degrees
There IS a Problem with the Engine COOLING SYSTEM, A Faulty Coolant Temp Sensor Will Cause this Problem. The Cooling fan is Also A Candidate For Testing.

Answering your Quwstion YES The Engine Coolant Temperture Sensor Tells the ECM What the TEMP Is and the ECM Grounds the Cooling FAN Relay to Turn ON Cooling FAN. Temp Sensor is the Usual Culpret, BUT Relay Comes in a CLOSE Second. Hope this Helps !!!

Posted on Jun 15, 2009

  • Ronnie Wilson Jun 16, 2009

    Ok Temp Sensor For Computer is Located @ Right of the Thermostst Housing, After this Would be

    The Cooling Fan RELAY Located Underhood ,Driver Side, Between Shock / Strut TOWER And This Could be Faulty It is IN the Electrical Box And as you look at it, There is 2 ROW 's of Fuses to the Left and 1 Row to the Right looking at it this way , For ! FAN >>The FAN RELAY is the TOP ROW SECOND RELAY FROM THE RIGHT)) and if you have 2 FAN'S The BOTTOM ROW 1ts RELAY is the Secondary Relay, Now aside form these Components I am Assuming You have Checked most other things such as,,, Radiator Blocked Inside or OUT,,Thermostat,, Loose Plugs @ Relay Box or Any INVOLVED Component ETC. YES the Computer Does Play a Role in this But All it Does is Keep track of the Engine Temp. And GIVE / SEND GROUND to the Cooling Fan RELAY to turn ON the FAN , Upon TEMPERTURE Needed for FAN to come on 210-230 DEG. PLEAE DO Reply and Lets see What this is Causing you this Problem.



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Fans not turning on and replaced the coolant temp sensor? Coolant in reserve but not in radiator?

why do you have ? on facts? odd that.
my guess replaced ECT ! not ?
my guess, doing so , now engine is full of air, and not fails.
as all do.
front RAD cooling FANS, right? (not heater blower )
it don't work like you think, ? huh?
what does" not in Rad "mean? with ? marks?

means you trust the silly side tank and not look in rad? fail you will.
when doing cooling service, learn read a book first.
read how to fill and burp your engine, Just like feeding a baby it is.
is engine overheating?
did it , has it, or ? , what started this saga, tell a full story?
and WIN !
Facts: on this system.
the fans are controlled by the computer brain, under a complex set rules now. it's not some mindless switch like days of old.
ill now answer for USA 03, how ours work,
ours has one fan., (not fans)
ours has a 3 speed fan (at rad back side.)
and has rules to run all 3 speeds, via 3 relays
the PCM/ECU decides this, based on if A/C is on or off.
and a complex set of rules (uses the ECT for this magic)
Fact 2: ECT will not work with air pockets !!!!
The PCM even turns on and turn off are not same temp!!!
1: Rad must be filled of AF/ 50% antifreeze cold, to the top neck of RAD filler.
2: rad and engine burped of all air pockets, ask it's same on all cars.
3: the ECT must work, right, if air pockets there, it CANT work.
4: park car, idle until the minimum engine time is reached parked.
about 180F, but all cars overheat if parked, idling and fan stays dead.
fan is off , and at some point, the fan goes to low speed.

this varies by engine option, but is around 225F. (stage1)
THE FSM covers these checks, and rules, and temps. for all 3 stages of fan speed.
scan the pcm yet>?
got P0128 DTC? or others, for temperatures wrong,
not scanning is a big mistake on all modern cars.
big time!
yes, rad must be full parked cold, yes, yes, yes...
side expansion tanks do fail. for many reasons. ask.

a 2.0L engine. only, here. 7.4quarts cooling cap.
here is ours. usa fan. a 4 wire fan it is....
the ecu controls it using SOFTWARE, (firm-ware in truth)
26098393-rlcj0qgtvzvpudyok3p1nj5o-4-0.jpg do not drive car until all air is burped out of engine and rad.
in fact run it idling to hot. 180f. ( too hot to touch long)
, kill engine with key.
let cool, to luke warm, or cold.
check rad level. (sure its low)
top it off, cap it,
repeat 3 times, before driving or if it holds levels.

Feb 17, 2016 | 2003 Suzuki Aerio

1 Answer

Camaro LT1 runs great, but idle speed varies when hot

The fan should come on and should flash 1 then 2 for normal operation. Your IAC valve on the throttle body should be cleaned or replaced. After reinstall , turn key to on position for 1 min. then off for 1 min. To reset.

Mar 11, 2014 | 1994 Chevrolet Camaro

1 Answer

Only 1 fan working on my 94 caprice what is the problem

Well, it all depends...

One is called an "A/C Condensor Fan". This one comes on whenever the air conditioner is running. The other one is the radiator cooling fan. This one comes on when the engine temperature reaches a certain point and the engine computer commands it to come on.

If either of these fans fail to work at all, the circuits must be diagnosed to locate the problem. It could be a bad fan motor, a bad fan control relay, a malfunctioning engine coolant temperature (ECT) sensor, or broken wires or loose connections between any of the components.
Low engine coolant (antifreeze) can even keep a radiator cooling fan from working (the ECT will not work correctly if the engine coolant is low).

Jan 26, 2012 | 1994 Chevrolet Caprice Classic

1 Answer

My radiator keeps losing coolant and i can't find a leak anywhere in the engine. My car also keeps overheating when setting idle and cools when im moving

Your cooling fans are not running when they should be (one is sensor controlled and runs at need) the other one manually comes on when the A/C is turned on so that fits with hot when idling and cooler when moving (you get some air flow while moving). The fans have relays and fuzes that should be located and checked. Once the relays are verified or replaced then the fans should run. If they still do not run perhaps they need replacing. DJP

Jan 21, 2011 | 1995 Buick Riviera

1 Answer

My 94 camaro is running hot at idle and while driving under 50. how do i know if my fan is working or what the problem may be?

The raditor may be only partly filled or stopped up. once running and warm if you touch the raditor it should be hot about the same all over. if the top part is hot and the bottm is cold then the raditor is stopped up. with the readitor removed and the hoses removed and a good high pressure water hose you might be able to wash it out good enough to get most of it working, don't forget to wash out the fins where the air goes though. a little soap in some sparyed on water and then reinise off good gets the dirt and bug juice off and it'll cool much better If a car comes into my shop and the raditor is more then 5 yeares since it was flushed and it appears to be partly stopped up i recomend it to be replaced. The fan should come on if you turn the aircomnditioner on, and if you let the car sit and run with the hood open it should also come on as the temperture gauge approches the red zone. it should stay on till the gauge is almost down to the middle. it shpuldn't take but a mintue with it just sitting there ideling to cool bach down with the fan running, Is the check engine light on? If it is the codes may indicate a fan relay problem or a overheating problem and you need to follow the rules for fixing those codes. Mixture control problems( codes ) can point out problems with overheating too.

Oct 13, 2010 | 1994 Chevrolet Camaro

1 Answer

The fan doesnt work but if i turn on the ac the fan starts working i want to know what the problem could be if some body could help me please. Thanks

The fan is used by both the engine cooling and the A/C systems. Evidently, your cooling system is not turning it on. Is the car overheating at idle? When I review the wiring diagrams for 89 Camaros, they indicate the fan is controlled by the engine control module using inputs from both the temperature sensor and the A/C settings. This leaves me puzzled. Do you have a temperature gage or light? If gage, how hot does it get? If light, does it come on?

Sep 11, 2010 | 1989 Chevrolet Camaro

2 Answers

My cooling fan doesn't come on when I start my car

the engines electric cooling fan is not designed to come on when u start the car, it only runs when the engine temp reaches about 225 degrees F, this only occurs after long idle times or very hot weather..

Mar 03, 2010 | 1994 Buick Park Avenue

1 Answer

Cooling system on 1994 ford thunderbird

does it run hot while driving or in traffic?
if running hot at idle could be water pump not circulating enough try revving engine some and see if temp comes down. also check your fan clutch.
if running hot going down road probably radiator

Sep 10, 2008 | 1994 Ford Thunderbird

2 Answers

1992 5.0 camaro no cooling fan except with ac

Yes there is a relay, but first answer this question, do you know the fans don't come on until the engine temp is above 230+ degrees F.? That is almost in the hot zone. run a scanner on the engine and watch the ECT sensor temp reading to verify proper cooling fan operation, a quick test to see if the system works is to unplug the ECT sensor, the fans will go into failure mode and turn on to avoid damage to the engine.

Sep 02, 2008 | 1992 Chevrolet Camaro

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