Coolant Fan Switch compatability

[dguy]

It looks like the coolant fan switch on my 2.8 has given up.

I have a spare from an 88 Firebirdie 2.8 which physically fits, but I have no idea if the cut-in/cut-out temperatures are in the correct range.

The Fiero's fan switch (p/n 3040674) should cut in at about 110°C and cut out at about 105°C. Does anyone know what the cut-in & cut-out temperatures for p/n 3053247 are?

-d.

[2ML67]

Most engines use approximately the same temp ranges as its the same temps for them that are bad to reach. Myself I wire the fan at the relay so its on whenever the ignition is on. Do not trust the sensors plus by the time they come on its too late. Dan

[dguy]

Do not trust the sensors plus by the time they come on its too late.

I have to contest that last comment...  when it works, the rad fan switch turns the fan on far in advance of too late.

Unless of course you're having trouble wiring up those L67's correctly.   

[Fiero_power]

Most engines use approximately the same temp ranges as its the same temps for them that are bad to reach. Myself I wire the fan at the relay so its on whenever the ignition is on. Do not trust the sensors plus by the time they come on its too late. Dan

I just have a quick question...  My fan is not kicking in as well.  Did you run a toggle or is yours on all the time?  If it is on all the time, are you not worried about burning out your fan motor?

Joe

[lacelles]

I was talking with a guy (27 years experience in mechanic) and he told me that on the fiero, the fan will kick in at aprox. 2 line before the red zone (temp gage).  I asked him that question because I though my fan was not working, but it was.

[poupas]

I have had my fan hardwired for years. Just a regular switch under the dash. Temp. goes up, I kick on the fan. (Which works great, thanks Dan)

[Fiero_power]

Mine used to kick on when it was about half way between 1/2 and 3/4, but now it'll run red hot if I get stuck in heavy traffic, as I realized trying to leave Montreal in roush hour.

[2ML67]

No problem with l67's wiring here they actually run nice and cool. Problems I had was with dukes they do not like heavy traffic on hot days unless fan is on all the time. Does not burn out the fans, I think its better than the fan never being used till the one time you really need it and find that its rusted and doesn't work or the sensor or relay to turn it on is no good. Dan

[RGBaker]

Here is a link to some data on the temperature standards for the cooling fan ...
http://www.fierofocus.com/articles/tt-clt_sens.html
My temperature gauge is slow to respond and under reports -- though it eventually moves into the operating range, and will eventually reveal high temps, it generally takes ten minutes or more to move to 'normal'.  A tap of the data sent to the ECM reveals that the temperature of the engine is behaving normally -- it is the gauge sensor that is out of whack.

Curiously, so too is the fan sensor apparently misbehaving ...  The fan will come on, either when the A/C is activated or when the gauge reads 'hot' -- but by the time the gauge reads hot the engine is in fact VERY hot!  So although my reading of the sensors is that the gauge sensor is not feeding the fan relay, somehow the relay responds at the same time as the gauge does, which is to say, too late.  So until I replace a couple of sensors, I'll use the A/C switch when in traffic and heading towards hot.

Cheers,
GB