

| Subject: | Re: Cooling Fan info discrepancies |
| From: | Mike |
| Date: | Fri, 12 Oct 2007 18:38:24 -0400 |
AFAIK, All models, two speeds. With A/C switch on, this forces on high speed fan operation (good to get it to stop overheating, if your fan switch is bad and your A/C compressor is removed, like on my old '84). Mike B. ----- Original Message ----- From: "Ben Cichowski" <cichowski@MONTANA.EDU> To: <vanagon@GERRY.VANAGON.COM> Sent: Friday, October 12, 2007 1:22 PM Subject: Re: Cooling Fan info discrepancies > Dylan, > > Someone please correct me if I'm wrong, but I believe vans without AC have > 2 > speeds (low...and high - just before overheating) just like the ones with > AC. However, I think there is actually a "3rd speed" if you will for those > with AC that is controlled by turning on the AC switch itself. > > Ben > > > On 10/12/07 10:49 AM, "dylan friedman" <insyncro@YAHOO.COM> wrote: > >> 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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