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- Path: sparky!uunet!destroyer!wsu-cs!usenet.ins.cwru.edu!po.CWRU.Edu!aas7
- From: aas7@po.CWRU.Edu (Andrew A. Spencer)
- Newsgroups: rec.autos.vw
- Subject: Re: Keeping Your Watercooled VW cool.
- Date: 17 Nov 1992 06:00:12 GMT
- Organization: Case Western Reserve University, Cleveland, OH (USA)
- Lines: 65
- Message-ID: <1ea1pcINNnnk@usenet.INS.CWRU.Edu>
- References: <1992Nov17.003738.8775@wuecl.wustl.edu> <921116.085913.amiller@almaden.ibm.com> <1e95p6INN51b@usenet.INS.CWRU.Edu>
- Reply-To: aas7@po.CWRU.Edu (Andrew A. Spencer)
- NNTP-Posting-Host: slc5.ins.cwru.edu
-
-
- In a previous article, christos@wucs1.wustl.edu (Christos Papadopoulos) says:
-
- >In article <1e95p6INN51b@usenet.INS.CWRU.Edu> aas7@po.CWRU.Edu (Andrew A. Spencer) writes:
- >>
- >>In a previous article, amiller@almaden.ibm.com (Alex Miller) says:
- >>
- >>>Running the fan all the time would lengthen the time it takes
- >>>for your engine to reach normal operating temperature - during
- >>>this time your performance will suffer and you'll pollute more.
- >>
- >>ok boyz and girlz..not to argue either view point, as i find this
- >>to be fairly informative, and i have my opinions, but no specific
- >>reazonz for what i do..so..i want a question answered...see..i
- >>would argue (if i were arguing) that what brother miller has said
- >>above is not true, as this is what the thermostat controlls...
- >>if the water is being coooled too much by a constanty running fan,
- >>the thermostat does not open as much....this is why trucks, and
- >>various other vehicles of even today that have the fan attached
- >>directly to the crank manage to still warm up,etc...like i said,
- >>though, i am not sure that this is how a thermostat works...can
- >>anyone help me here?(sorry A. Miller, but i just have to ask this
- >>but do not wish to dispute what you have said, so please, not to
- >>take this as a personal flame!)
- >>thanx one and all!
- >>DREW
- >
- > I too think that Alex's reasoning maybe flawed during
- >correct engine operation. Let me explain: In VWs (and most
- >cars for that matter) there are two passages that circulate coolant
- >through the engine: (1) through the radiator, and (2) through a bypass
- >hose. The latter completly bypasses the radiator and is used when the
- >engine is cold. This allows the engine to rise to normal operating
- >temp very fast. After that the thermostat opens slowly letting in cold
- >coolant from the radiator. As the temp keeps rising the thermostat opens more
- >allowing more coolant from the rad to circulate through the engine.
- >Finally, all of the coolant flows through the radiator and the bypass
- >hose is bypassed. Thus the expansion of the thermostat accomplishes
- >two different things: (1) opens the radiator passage, and (2) closes the
- >bypass hose passage. The two are complimentary, i.e. when one is fully
- >open the other is fully closed and vice-versa. The water pump is unaware
- >of which passage is used.
- >
- > If the fan runs constantly it cools only the radiator coolant
- >during startup, thus not affecting the rate the engine warms up. As
- >Drew pointed out, the only side effect is that the coolant in the radiator
- >gets colder, but this simply causes the thermostat to open less, thus
- >still maintaining the correct engine temp. However, it is possible that
- >there might be some coolant leakage from the radiator during warmup
- >if the thermostat is old and does not seal very well, in which case running
- >the fan constantly will cause slower engine warmup.
- >Alex's point is valid in this case.
- >
- > Hope this helps.
- >
- >Christos.
- >
-
- this is what i, too, was thinking. thank you for being more clear and
- precise than i.
- DREW
- --
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