overheat mystery

[Chris Hall]

The easiest way to tell if the fan works is to jump the 2 wires on the
connector for the thermo switch that activates the fan.  If the fan
comes on that way, then the temp sender that switches the fan on and
off is bad.

My 83 CGT had a temp sensor for the fan fail... it was located at the
bottom of the radiator.  I think it was like $10 or something...



On 6/30/05, Eric_R_Kissell at whirlpool.com <Eric_R_Kissell at whirlpool.com> wrote:
> 
> I would first verify the cooling fan is working.
> 
> Does the fan blade turn freely by hand? Is there any looseness if you try
> to move the blade tips in and out from the radiator? If so, the bearings
> are shot and you need to replace the bearings. They are available from
> about any (industrial) bearing supply house, though I do not have the size
> at my fingertips right now.
> 
> If the fan turns and the bearings do not allow the blade to wobble, start
> the car and let it run at an idle until the fan cycles. Watch the temp
> gauge as you do this and stop things before the temperature gets to
> head-warping level if the fan fails to cycle.
> 
> Note, if the radiator fan has seized or does not turn freely you are at
> risk of a wiring meltdown or even a fire unless you have added a fusible
> link to the fan circuit. If you have added previously a fusible link to the
> circuit, see if it has blown and then figure out why.
> 
> Also, the fan should always run when the air conditioning is running, i.e.
> when the climate control is set on Auto or Bi-Level. Is this working in
> your car?
> 
> HTH,
> Eric
> 
> 
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-- 
Chris Hall
badcomrade at gmail.com
"making girls cry since 1974"