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  #1 (permalink)  
Old 17 Jan 2011, 06:36 pm
Cameo
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Default Cooling fan after engine stop

Is it normal for a cooling fan to start up automatically after every
trip, even in cold or rainy weather? I had the impression that it is
only needed after some serious engine loads and in pretty warm weather.
My Accord's fan seems to kick in for about a minute or so after a few
seconds following every trip, even fairly short ones that could not have
heated up the engine very much.

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  #2 (permalink)  
Old 18 Jan 2011, 06:45 am
Tegger
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Default Re: Cooling fan after engine stop

"Cameo" <cameo@invalid.invalid> wrote in news:ih2nao$hke$1@news.eternal-
september.org:

> Is it normal for a cooling fan to start up automatically after every
> trip, even in cold or rainy weather? I had the impression that it is
> only needed after some serious engine loads and in pretty warm weather.
> My Accord's fan seems to kick in for about a minute or so after a few
> seconds following every trip, even fairly short ones that could not have
> heated up the engine very much.
>



The fan is supposed to turn on after shutdown if the engine oil gets over a
certain temperature (240F? I forget). If the fan is coming on at times when
the oil cannot possibly be overheated, then the sensor is probably getting
old and is kicking in too soon.

A new one is about $40 at the dealer.

--
Tegger
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  #3 (permalink)  
Old 18 Jan 2011, 01:59 pm
Cameo
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Default Re: Cooling fan after engine stop

"Tegger" <invalid@example.com> wrote:
> The fan is supposed to turn on after shutdown if the engine oil gets
> over a
> certain temperature (240F? I forget). If the fan is coming on at times
> when
> the oil cannot possibly be overheated, then the sensor is probably
> getting
> old and is kicking in too soon.
>
> A new one is about $40 at the dealer.


Thanks, as always, Tegger. Now, if it was as easy to replaced as those
alternator brushes, I would go for it. But isn't it also possible that
perhaps the radiator tubes have lost too much of their heat transfer
capacity (due to deposits) and that causes inadequate cooling? Probably
not though because the temp guage seems to work normally as it usually
stays below 40% of the scale.

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  #4 (permalink)  
Old 18 Jan 2011, 05:14 pm
Tegger
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Default Re: Cooling fan after engine stop

"Cameo" <cameo@invalid.invalid> wrote in news:ih4re2$e4o$1@news.eternal-
september.org:

> "Tegger" <invalid@example.com> wrote:
>> The fan is supposed to turn on after shutdown if the engine oil gets
>> over a
>> certain temperature (240F? I forget). If the fan is coming on at times
>> when
>> the oil cannot possibly be overheated, then the sensor is probably
>> getting
>> old and is kicking in too soon.
>>
>> A new one is about $40 at the dealer.

>
> Thanks, as always, Tegger. Now, if it was as easy to replaced as those
> alternator brushes,




Easier, I think. Except that it might need to be from under the car.



> I would go for it. But isn't it also possible that
> perhaps the radiator tubes have lost too much of their heat transfer
> capacity (due to deposits) and that causes inadequate cooling?



Were that the case, you'd have overheating at speed.


> Probably
> not though because the temp guage seems to work normally as it usually
> stays below 40% of the scale.
>



Then it's just a sensor. But I don't have diagrams to show me exactly where
the sensor is on your car.

If you feel like spending $10, you can get 3 days of all-you-can-download
from Honda's Techinfo site. You'll find the exact location of the sensor,
including replacement instructions.
https://techinfo.honda.com


--
Tegger
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  #5 (permalink)  
Old 19 Jan 2011, 01:54 pm
Cameo
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Default Re: Cooling fan after engine stop

"Tegger" <invalid@example.com> wrote:
> Easier, I think. Except that it might need to be from under the car.


I found that ECT sensor and it's impossible to get to without removing
the distributor. It's right under it and you cannot get to it from
below. either. Yeap, both the ECT sensor and ECT gauge sending unit are
under that darn distributor. There is an easily accessible ECT switch B
at the junction of the upper radiator hose and engine block, but I think
the sensor is the one that should be replaced. The ECT switch A, that's
also in a hard to reach location at the thermostat, is probably all
right, too.

Since I see some oil leak at the distributor, I might have the mechanic
fix the leak and replace the ECT sensor at the same time. That job would
be over my head, I'm afraid.

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  #6 (permalink)  
Old 19 Jan 2011, 05:27 pm
Tegger
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Default Re: Cooling fan after engine stop

"Cameo" <cameo@invalid.invalid> wrote in news:ih7fgv$c3o$1@news.eternal-
september.org:

> "Tegger" <invalid@example.com> wrote:
>> Easier, I think. Except that it might need to be from under the car.

>
> I found that ECT sensor and it's impossible to get to without removing
> the distributor.




I don't think that's th one you want.

That's for the COOLANT, not the OIL.

You'd better spend the $10 to search Techinfo, or you may end up blowing a
LOT more chasing the wrong rabbit.



--
Tegger
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  #7 (permalink)  
Old 19 Jan 2011, 05:33 pm
Tegger
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Default Re: Cooling fan after engine stop

Tegger <invalid@example.com> wrote in
news:Xns9E72BBBBCAE47tegger@208.90.168.18:

> "Cameo" <cameo@invalid.invalid> wrote in
> news:ih7fgv$c3o$1@news.eternal- september.org:
>
>> "Tegger" <invalid@example.com> wrote:
>>> Easier, I think. Except that it might need to be from under the car.

>>
>> I found that ECT sensor and it's impossible to get to without
>> removing the distributor.

>
>
>
> I don't think that's th one you want.
>
> That's for the COOLANT, not the OIL.
>
> You'd better spend the $10 to search Techinfo, or you may end up
> blowing a LOT more chasing the wrong rabbit.
>
>
>




I'd search it for you, but the $10 subscription only lasts 3 days, and I
don't have a reason to go back in right now.


--
Tegger
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  #8 (permalink)  
Old 19 Jan 2011, 09:56 pm
Cameo
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Posts: n/a
Default Re: Cooling fan after engine stop

"Tegger" <invalid@example.com> wrote:
>> I don't think that's th one you want.
>>
>> That's for the COOLANT, not the OIL.
>>
>> You'd better spend the $10 to search Techinfo, or you may end up
>> blowing a LOT more chasing the wrong rabbit.
>>

> I'd search it for you, but the $10 subscription only lasts 3 days, and
> I
> don't have a reason to go back in right now.


I have access to the '94 Accord Service Manual and from what I could
find the fan control is tied to the ECT stuff. I haven't seen anything
on a separate oil temp sensor but I'll take another look. I'd rather not
pay for something I can get free. Even if I can afford it.

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  #9 (permalink)  
Old 20 Jan 2011, 10:46 am
Tegger
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Posts: n/a
Default Re: Cooling fan after engine stop

"Cameo" <cameo@invalid.invalid> wrote in news:ih8bpi$fbf$1@news.eternal-
september.org:

> "Tegger" <invalid@example.com> wrote:
>>> I don't think that's th one you want.
>>>
>>> That's for the COOLANT, not the OIL.
>>>
>>> You'd better spend the $10 to search Techinfo, or you may end up
>>> blowing a LOT more chasing the wrong rabbit.
>>>

>> I'd search it for you, but the $10 subscription only lasts 3 days, and
>> I
>> don't have a reason to go back in right now.

>
> I have access to the '94 Accord Service Manual and from what I could
> find the fan control is tied to the ECT stuff. I haven't seen anything
> on a separate oil temp sensor but I'll take another look. I'd rather not
> pay for something I can get free. Even if I can afford it.
>
>




Only the US got fan-control that took oil temperature into consideration.
Manuals meant for other places in the world may not mention such US-specifc
stuff.

Be careful.

--
Tegger
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  #10 (permalink)  
Old 20 Jan 2011, 04:59 pm
Dillon Pyron
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Default Re: Cooling fan after engine stop

Thus spake Tegger <invalid@example.com> :

>"Cameo" <cameo@invalid.invalid> wrote in news:ih2nao$hke$1@news.eternal-
>september.org:
>
>> Is it normal for a cooling fan to start up automatically after every
>> trip, even in cold or rainy weather? I had the impression that it is
>> only needed after some serious engine loads and in pretty warm weather.
>> My Accord's fan seems to kick in for about a minute or so after a few
>> seconds following every trip, even fairly short ones that could not have
>> heated up the engine very much.
>>

>
>
>The fan is supposed to turn on after shutdown if the engine oil gets over a
>certain temperature (240F? I forget). If the fan is coming on at times when
>the oil cannot possibly be overheated, then the sensor is probably getting
>old and is kicking in too soon.
>
>A new one is about $40 at the dealer.


Does the fan also run if the A/C compressor is "on" and the ignition
set to "ACC" (or whatever it is, the manual is out in the garage)? I
could have sworn that on those 100+ days when I was auto-x'ing that
we'd pop the hood and turn the A/C on to cool the radiator between
runs. There's nothing like 100+ air, 130+ pavement and 30 or so
seconds of 1st & 2nd gear to warm up an engine.
--

- dillon I am not invalid

An object's desireability to a dog is directly
proportional to its desireability to another dog.

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