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Date:         Wed, 2 Sep 2015 18:39:04 -0400
Reply-To:     Larry Alofs <lalofs@GMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Larry Alofs <lalofs@GMAIL.COM>
Subject:      Re: Radiator Aux Cooling Fan 84 vs. 90 - compressor on for Aux
              Fan to kick-on with 90 model??
Comments: To: Jack Reynaert <jack007@comcast.net>
In-Reply-To:  <004101d0e5b0$da275540$8e75ffc0$@net>
Content-Type: text/plain; charset=UTF-8

You should be able to pull it out and check it with an ohmmeter. The one in our '91 failed some years ago due to corrosion if I recall correctly. Fixed with careful disassembly and cleaning.

Larry A.

On Wed, Sep 2, 2015 at 2:54 PM, Jack Reynaert <jack007@comcast.net> wrote:

> Update: > > Changed the Tri-Pressure Switch, as by-passing resulted in unit running, > but > that didn't fix it > Checked the resister behind head-light, working fine, as variable speed on > Aux Fan working in high-heat. > > Ran a by-pass to the Aux-Fan, and able to charge and run the ac, when > by-pass switch is on... so AC works with a manual switch. > > Could the issue be a bad A/C Fan Switch on our friend's 90 Westy? > > http://www.gowesty.com/ec_view_details.php?id=3314&category_id=69&category_p > arent_id= > > Thanks! > > Jack > > -----Original Message----- > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of > Dennis Haynes > Sent: Sunday, August 23, 2015 11:12 PM > To: vanagon@GERRY.VANAGON.COM > Subject: Re: Radiator Aux Cooling Fan 84 vs. 90 - compressor on for Aux Fan > to kick-on with 90 model?? > > In your case the compressor is out on a safety. As the controls are calling > for the compressor the radiator fan is turned on. > > Dennis > > > -----Original Message----- > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of > James > Sent: Sunday, August 23, 2015 10:56 PM > To: vanagon@GERRY.VANAGON.COM > Subject: Re: Radiator Aux Cooling Fan 84 vs. 90 - compressor on for Aux Fan > to kick-on with 90 model?? > > In our '91, the radiator fan turns on when the AC is turned on, even > without > the compressor running (our compressor is in place, but the system has no > charge, as the compressor needs replaced... the fan turns on anyway). > > James > Ottawa, ON > > > Date: Sun, 23 Aug 2015 10:59:39 -0400 > > From: jack007@COMCAST.NET > > Subject: Re: Radiator Aux Cooling Fan 84 vs. 90 - compressor on for > > Aux > Fan to kick-on with 90 model?? > > To: vanagon@GERRY.VANAGON.COM > > > > Once we get the AC charged, then I can test the low-speed fan with AC > running. > > BTW... Replaced Condenser, and both AC lines from Rear to Front (had > > AC > lines made up at local shop N. of Detroit for $225, with ends) > > > > Since the 1990 is much different than my 1984 Vanagon, it may require > > the > compressor running to turn on the low speed. > > My 84 will kick the Aux fan on, just by turning on the AC (even at > > higher > temp, without the compressor running). > > Does anyone know if the 1990 models require that the Compressor is > > running > for the Aux fan to kick-on? > > > > Note: we changed the temp sensor/switch on the Radiator and the fan > > kicked > on (low speed), when sitting at idle for a long while. > > Glad I found my spare switch in my box of Vanagon parts :), didn't > > realize > I had one around, and the same switch is use on 84 / 90's. > > > > I really appreciate all the expert advice! > > > > Jack > > > > -----Original Message----- > > From: Dennis Haynes [mailto:d23haynes57@hotmail.com] > > Sent: Saturday, August 22, 2015 8:10 PM > > To: 'Jack Reynaert'; vanagon@GERRY.VANAGON.COM > > Subject: RE: Radiator Aux Cooling Fan 84 vs. 90 > > > > I guess if it's on the Samba it must be true. The radiator fan switch > senses the water temperature in the radiator closer the outlet than inlet. > A > higher temp thermostat will make less coolant flow until it fully opens > allowing the radiator more time for it to cool. It is true that too low a > temp fan switch will run the fan needlessly. A 75c switch is ridiculous. In > hot weather with a good load you will never get the coolant temp that cool > so the fan goes forever. If you use the AC the fan will run for the > compressor anyway. If in this situation the radiator switch calls for the > fan above that the radiator is either saturated with heat due to extreme > conditions including it may not be good or the fan switch is too low. > > > > Dennis > > > > > > -----Original Message----- > > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On > > Behalf Of > Jack Reynaert > > Sent: Saturday, August 22, 2015 7:57 PM > > To: vanagon@GERRY.VANAGON.COM > > Subject: Re: Radiator Aux Cooling Fan 84 vs. 90 > > > > Dennis and everyone else, > > > > Thank you for your great information. > > > > PS... was thinking about the low-temp switch, but just saw this on > TheSamba. > > "Just remember that the fan switch needs to be matched with the > thermostat. If you run the low temperature fan switch with a higher than > stock thermostat the fan may well run too often." > > > > > > Jack > > > > -----Original Message----- > > From: Dennis Haynes [mailto:d23haynes57@hotmail.com] > > Sent: Saturday, August 22, 2015 4:31 PM > > To: 'Jack Reynaert'; vanagon@GERRY.VANAGON.COM > > Subject: RE: Radiator Aux Cooling Fan 84 vs. 90 > > > > The wiring and operation of the 90 is drastically different than in > > the > 84. The fan motor is much larger, one speed using a resistor to provide > lower speeds and multiple relays for control. Also depending on variations > some will have the cooling fan low speed operation effected or even > disabled > if the AC wiring is hacked. Here is a brief summary of expected operation. > > > > Engine cooling > > When radiator fan switch calls for low speed cooling the switch > > directly > supplies power from the fuse block through the resistor to the motor. > > When same switch calls for high speed there is a relay above the fuse > box. > This relay brings power directly from the battery (own wire) through a > fusible link directly to the fan motor. A failed fuse for the control and > low speed disables both these systems. > > > > To support the Air conditioner > > When the compressor is on the fan runs at a low speed energized from a > relay in the AC system. This also depends on the fan resistor. > > If system (AC) high side pressure increases due to insufficient > > cooling a > pressure switch operates a relay in the fuse box to increase the radiator > fan speed. Basically the other side of the fan resistor is placed in > parallel increasing current flow and thus fan speed. > > If pressure continues to climb at some point the AC will get cut out > > and > the fan will still run at the higher speed until it drops. > > > > There are number of different pressure switch set ups. Most of the > > late > vans use a single switch with multiple function often known as a trinary > switch. > > > > Trinary switch functions > > Low pressure (lost charge) cut out. > > 2 speed condenser (radiator) fan. > > High pressure cut out. > > > > The 84 has none of these features or safeties. They just self-destruct > when things go wrong. > > > > Dennis > > > > > > -----Original Message----- > > From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On > > Behalf Of > Jack Reynaert > > Sent: Saturday, August 22, 2015 2:25 PM > > To: vanagon@GERRY.VANAGON.COM > > Subject: Radiator Aux Cooling Fan 84 vs. 90 > > > > When I run the AC on my 84 Westy, the Aux. fan on the Radiator runs as > long as the power is on to the AC in back (regardless if the compressor is > on). > > When I'm stuck in traffic, and the temp gage rises, the Aux fan does > > not > kick-on by itself. So, I turn on the AC, without compressor, and the fan > kick's on and the temp gage goes down. I suspect the temp sensor on the > radiator is bad, and plan to change it. > > > > Now, my question is related to the Aux radiator fan on the 90 Westy we > > are > just about complete with the mechanical overhaul (including new 2.2 GW > motor, brake system, radiator, condenser, LED upgrades, dash rebuilt with > AWESOME GW Kit, new everything that attaches to the GW motor as well). > > > > We took it for a ride today, and even at full operating temperature, > > the > aux fan didn't kick on. Put 12v to the fan motor and it worked fine, fuse > #1 fine, power to the red/white wire to the switch etc. However, when we > turned on the AC, the aux fan didn't turn on (like it does on my 84)... is > that normal for a 90? > > > > Any suggestions on likely causes (relay #53 or temp. sensor lower > > drivers > side of radiator?) > > > > Thanks for any insight! > > > > Jack R. > > N. of Detroit >


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