Date: Fri, 12 Oct 2007 09:49:10 -0700
Reply-To: dylan friedman <insyncro@YAHOO.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: dylan friedman <insyncro@YAHOO.COM>
Subject: Re: Cooling Fan info discrepancies
In-Reply-To: <470FA276.7020707@comcast.net>
Content-Type: text/plain; charset=iso-8859-1
Do vans without AC have two speeds or just one?
curious.
dylan
Kenneth Wilford <kenwilfy@COMCAST.NET> wrote: Ben, if you are getting both speeds by jumpering the connections at the
fan switch plug then your low speed resistor has to be fine.
If the fan is coming on when you jumper it at the fan plug that means
that the fan itself and all of the wiring, relays, resistor, fuses are
good to go. The only thing that can keep it from coming on at this
point is the thermoswitch on the radiator. I would get a infrared heat
gun and start taking temperature readings. Is the radiator getting hot
enough for the thermoswitch to turn the fan on? If it is then the
thermoswitch must be having a problem. You should be able to measure
across the switch when the temperature is up to see if it completes the
circuit at the proper temperature (zero resistance with an ohm meter).
So your problem has to be right at the radiator, at the thermoswitch.
You can stop hunting further. Determine if it is reaching the proper
temperature and then go from there.
Hope this helps,
Ken Wilford
John 3:16
www.vanagain.com
Ben Cichowski wrote:
> Hi All,
>
> Been reviewing archives for days in hopes of not pestering anyone about my
> cooling fan problems, but I'm running into a lot of conflicting info and
> want to trouble shoot possible reasons for my cooling fan not kicking on:
>
> This is for an '88 Vanagon Wolfburg Weekender
>
> Everything now heats properly (both sides of the radiator get properly hot,
> and the thermoswitch is new, so is the water pump, radiator, thermostat) -
> there were other problems before this one came up!
>
> Things that have been RULED OUT or, in some cases, replaced if found to be
> bad. (to save time on your responses)
> Radiator, Thermoswitch, Thermostat, Fuses, Water Pump, coolant level or
> quality, headgasket, cap on coolant tank, bubbles in coolant system (many
> good burping sessions with the front end WAY up and my prego wife at the RPM
> station).
>
> 1. I connected the slots on the 3-pin plug for the thermoswitch and I get
> both speeds to come on. Question: Does this test rule out problems with the
> resistor behind the headlight? - discrepancies in archives here
>
> 2. Could the relay under the dash be the cause of these problems? Some say
> that changing this worked for similar problems, others say that the relay
> could not possibly have anything to do with this.
>
> 3. I changed the ground connectors on the fan itself and behind the dash,
> but I'm still leaning towards this all being a problem with wiring. How the
> heck do you check for internal breaks in the wires given the length and
> tight location? Should I just change out all the wires and see if it works??
>
> Thank you so much, I know you have all probably written too much on this
> already, I'm jus trying to sort through what information is correct.
>
> Cheers,
> Ben
>
>
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