cooling fan

"tony" wrote in news:vpudnTDrRaOkEg7WnZ2dnUVZ snipped-for-privacy@neonova.net:

That's about normal behavior.

The gauge is actually usually pretty accurate.

I think you've got nothing to worry about. Enjoy your Honda.

Tegger wrote in news:Xns9D34BB959F2Ategger@

After reading Jim Yanik's post... I stand by my reply--so long as the temp gauge _never_ climbs above about the 40% mark.

If the gauge DOES move above the 40% mark, more investigation is needed, starting with an infrared thermometer reading of the upper rad hose inlet out of the head.

And if an aftermarket thermostat is present in this engine, GET RID OF IT IMMEDIATELY in favor of OEM (as per Yanik). That alone solves many Honda cooling system problems.

It has been suggested to me here, by different people, that having the fan run after engine shutdown is both helpful and useless.

Since most cars do not do this, it is obviously not a big deal either way. If it were, modifying the car to run the fan after shutdown would be a common modification.

In any case, I will leave it alone on both the Honda and the turbo Mazda.

Thanks!

Huh? AFAIK, the cooling fan has only one function - cooling. That's why it continues after you've shut the engine off, more cooling.

Bingo, I had a '79 Rabbit as well.

Yeah, I know that the cooling fan is for cooling. I was not asking what a cooling fan does.

My question, specifically, was why all cars with electric fans do not do this, if it is indeed helpful to have additional cooling after the car has been turned off.

Beam already answered my question with what I had suspected was the correct answer.

"because it's not necessary. it also depends on the coolant flow design. if you notice, the radiator coolant flow on a honda is still top-to-bottom. this gives a component of thermosiphon just like tegger says. no need for a fan after shutdown."

pws wrote in news:hnlc4m$avi$ snipped-for-privacy@speranza.aioe.org:

All Hondas have top/bottom rad tanks. All Hondas do not have after-shutdown fan cooling; it seems to be installed only on Accords/Preludes

After-shutdown fan operation may be due to larger engines having more massive blocks that retain heat better, and need more help shedding post- shotdown heat-soak than Hondas with less-massive blocks. This is a guess on my part.

Tegger wrote in news:Xns9D3CD1C4C7EE8tegger@208.90.168.18:

One day, I swear, I will learn to type.

Of course, this should read, "post-SHUTdown"...

I don't remember the S2000 having after-shutdown fan cooling, and it has the same size engine as the 1995 Accord.

The newer Accords do not do this either. My best guess is that there were enough customer complaints and that was weighed against no real benefit so the decision was made to drop the after-shutdown fan operation.

I might disable this on my 1995 Accord after all. If there are any problems resulting from doing this, I will post them here.

Other possibilities exist, of course, e.g., crummy design, company too cheap to implement something like this, even if it's indicated, etc.

Sorry if I came across a little snarky, not intended. :)

Funny, I read what you meant. :)

Same here, my text often comes across wrong. No offense taken at all.

Thanks,

Pat

All my Hondas have cross flow radiators, (pre plastic era).

JT

Grumpy AuContraire wrote in news:WsudndqoLoUPhz3WnZ2dnUVZ snipped-for-privacy@giganews.com:

So they have a tank on the left and a tank on the right, like my daddy's

cooling is one thing honda have dead right. if you look, they have a very sophisticated system - the thermostat is on the "cool" side of the radiator, but the thermostat wax unit sits in its own direct circuit so it's responding to actual circulation temps, not blocked convection temps like so many other cars.

I did not know this. Thanks for the information. I know a lot about most things Mazda Miata/MX-5, but my Honda information is very spotty so I have a lot to learn.

Yep... The first cross flow I remember was on my old 1963 Avanti.

JT

Grumpy AuContraire wrote in news:9cKdnRQ93LlBtDzWnZ2dnUVZ snipped-for-privacy@giganews.com:

Well, by 1986 they were top/bottom across-the-board.

jim beam wrote in news:vbmdnY7SW9Ya0z3WnZ2dnUVZ_hs snipped-for-privacy@speakeasy.net:

I'm not so sure of that.

The Honda rad-fan system has the fan OFF unless everything is absolutely correct. This means that the slightest thing that goes wrong results in an inop fan, and overheating is the consequence.

Toyota has a better system: the slightest thing that goes wrong has the rad-fan ON all the time. Impossible to overheat on account of an inop rad fan.

All North-American-market cars since about 1990 have the system you describe. Hot-side thermostats went out with carburetors.