Date:         Mon, 31 Jul 2000 14:31:49 -0400
Reply-To:     John <johnpatt@warwick.net>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         John <johnpatt@warwick.net>
Organization: PattonSystems International
Subject:      Aux fan function
Comments: To: Gerald Masar <azsun99@earthlink.net>
Content-Type: text/plain; charset=us-ascii

Gerald Masar wrote:
>
> Listees,
> In the heat of the current Arizona summer, my cooling system and A/C
> are getting a real workout. When the rad. fan is on low speed, it sounds more or less normal

Hi Jerry,

Before you do fan surgery, consider what is "normal" operation. From
your discription you refer to two fan operating stages but there are
actually three.

1st stage(2 resistors in series): coolant temperature exceeds 95*C or
whenever the A/C system is switched ON--operating sound = quiet and
"normal".

2nd stage(1 resistor): A/C high side pressures exceed 15 bar--operating
sound = much louder and noticeable compared to 1st stage sound.

3rd stage(no resistor): coolant temp exceeds 102*C--operating sound =
B29 haulin' ass with a bent propeller!

Before attempting to repair the fan, check:

1) The A/C compressor cycling on/off controls and high side pressure.

2) The functional switching point of the 15 bar high side switch.

3) The coolant temp and the switching point of the 95/102*C temp switch.

Regards,    John