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Date:         Thu, 23 Sep 1999 12:06:47 -0400
Reply-To:     John <johnpatt@WARWICK.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         John <johnpatt@WARWICK.NET>
Subject:      [Fwd: Re: bad gas mileage]
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Message-ID: <37E8EBB6.3F5F@warwick.net>
Date: Wed, 22 Sep 1999 10:46:14 -0400
From: John <johnpatt@warwick.net>
Reply-To: johnpatt@warwick.net
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To: Michael Townsend <townsend@RTP.ERICSSON.SE>
Subject: Re: bad gas mileage
References: <049401bf04fb$fab60b00$dc897593@rpc3430.rtp.ericsson.se>
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Michael Townsend wrote:
>
> Hi,
>
> My 90 Carat 4spd with a new VW Waterboxer only gets about 14 in town and 16
 Someone mentioned the Temp II sensor.




Hi Michael,


The coolant temp sensor is an NTC (negative temperature coefficient)
device. I once heard a guy liken the NTC principle to a "woman" since
the hotter it gets the Less resistance it has. However that guy was
murdered by a woman shortly after making that comment so I think its
healthier to stick to purely mechanical discriptions ! As an example,
when cold the sensor might have 2,000 to 4,000 ohms of resistance and
when Full hot the ohmic value should be 250 to 400 ohms. The Digifant
Control Module shoots 5V through the sensor and monitors how much comes
back. When a small voltage returns due to high resistance, warm up
enrichment is provided. As the voltage value rises due to falling
resistance, the warm enrichment is reduced until at 250-400 ohms, there
is no extra enrichment. If you need an exact temp-resistance comparion,
there's a chart in the Bentley book.


As for the A/C belt noise I would wonder if the CORRECT belt was
installed. Sometimes because a belt fits its presumed to be OK but it
lacks sufficient contact area to handle the load. I think the correct
one is 10 x 1100. Is the correct belt installed ?


As for electrical load, the A/C does not draw more current than high
beams or high fan speeds. A good portion of the A/C on current load is
the evaporator fans(2) and the radiator fan. Poor connections would not
increase current flow, it would reduce it. If you're not blowing fuses
or fuse links, the A/C on current should be OK. You could check the
ohmic value of the A/C compressor clutch. It should be ~4 ohms.


Goood luck,    JP
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