Date: Tue, 4 Aug 1998 14:25:42 -0400
Reply-To: Dennis Haynes <dhaynes57@EMAIL.MSN.COM>
Sender: Vanagon Mailing List <Vanagon@vanagon.com>
From: Dennis Haynes <dhaynes57@EMAIL.MSN.COM>
Subject: Re: How hot is HOT?
The fan was probably cycling in high speed to cool the AC,(pressure switch).
This is normal.
Dennis
-----Original Message-----
From: Ari Ollikainen <Ari@OLTECO.COM>
To: Vanagon@VANAGON.COM <Vanagon@VANAGON.COM>
Date: Monday, August 03, 1998 9:59 PM
Subject: How hot is HOT?
> It hit 100+ in my neighborhood today AND my HIGH-speed radiator fan
> cycled on while running the AC and idling my 90/91 camper, waiting
in
> line to pick up my daughter from summer day camp. The temp gauge
> needle NEVER got more than a needle width toward HOT beyond the
LED.
> This prompted me to think about what constitutes OVERheating versus
> just normal operation in HOT ambient conditions. I found some
> interesting numbers in Bentley:
>
> Thermostat begins opening at 85C/185F; fully open at ~ 105C/221F
>
> Thermoswitch for radiator fan Stage I Stage II Stage
III
>
> Cut-in temp 89C-94C 95C-100C ??
> 192F-201F 203F-212F
>
> Cut-out temp 81C 87C ??
> 178F 189F
>
> So...as long as the waterpump circulates coolant AND the faster
> radiator fan cycles on and off, the cooling system is health and
> doing its job?
>
> If the cut-out temp for the thermoswitch for stage I is below
> thermostat opening temp, this means that the thermostat closes
> to keep the engine within normal OPERATING temperature? (DOH!)
> Similarly, for stage II, the RRRRRRRR speed has to cool the
> circulating coolant down to 189F before cutting off the fan, which
> means, again that the thermostat would now be partially closed to
> keep the engine within the normal temperature range...which would
> tend to explain why there are no wild fluctuations of the needle
> in my temp gauge when this is happening since the tempgauge sender
> is on the engine side of the thermostat and thus in the "internal"
> coolant circulation loop...Typically the needle reaches a needle
width
> beyond the LED when the either fan speed cuts in. It's still
> thereabouts when either fan speed cuts out. Is this normal?
>
>
>
>
>
>
>
> OLTECO Ari Ollikainen
> P.O. BOX 3688 Networking Technology and Architecture
> Stanford, CA Ari@OLTECO.com
> 94309-3688 415.517.3519
|