Temps

[Leroy Eckert]

This is related to a 1990 WB-40. If your coach has an electric fan override yours should be similar but not necessarily identical. I have read that certain early models operate the fan with an air valve as opposed to electric. The small radiator that sits on the bottom of the main radiator is a Hayden and cools the power steering and hydraulic fan oil. There are three filters in the oil reservoir and one Parker canister in line filter on the roadside. If you follow the water hoses they should go to heat exchangers for the tranny and engine oil possibly from a manifold on the road side. Radiator water cools the engine and tranny oil. Fan operation if yours is Alarmstat electric control. The fan operates in idle(approx. 300-500rpm)except as follows: Alarmstat turns on the fan to high mode at 195 degrees and cycles it to low mode at about 188 degrees. You should be able to see this happen on the water temp gauge while driving. If the temp is not reduced to 188 degrees the fan remains in high mode until temps reach the lower value of the Alarmstat. The Alarmstat is located at or near the water pump in the water jacket. It is a bulb looking instrument with two wires. This unit is designed to default to fan high mode in the event of failure. Your fan operating in high mode at all times could be due to a failed Alarmstat(likely) or the Alarmstat has been removed by a PO. or a problem with a a/c/fan relay(unlikely) While stationary at idle have someone operate the fan override and/or chassis a/c and see if the fan speed changes. There is a very noticeable difference. With the chassis a/c or fan override on the fan runs in high mode until either or both are switched off. Switching either one on takes the Alarmstat out of the system and runs the fan on high. My understanding is that engine idle speed provides more than adequate fluid volume to operate the fan on full high mode. My fan enable relay is in the lower load center on an ignition circuit. You need to find someone with 1986 prints for your records. I bet someone out there has a set. I have a fan circuit diagram for my coach if you want a copy. It may not be identical to your coach. Leroy Eckert 1990 WB-40 Royale Dahlonega, GA Smoke N Mirrors --- On Wed, 6/18/08, putneyflash@... wrote: From: putneyflash@... Subject: Re: [WanderlodgeForum] Re: Temps To: WanderlodgeForum@yahoogroups.com Date: Wednesday, June 18, 2008, 7:34 AM Not to butt in, But the Fan/steering pump is either a gear or vane pump and both depend on Rpm's to move oil, so there comes a point where you must have high rpm's to get the maxium flow to turn the hydraulic motor at its maxium, speed. -- RE -------------- Original message from "Glenn Allen" : -------------- Pete, Good Summary. Can you or someone elaborate on the following questions I have about the areas of your post noted below relative to a 1986 PT-40 6V92. Thanks, Glenn....(see questions noted below your comments): > The transmission cooler is in the bottom of the > water radiator. The other radiator you see is not the > transmission cooler. (I don't think it even has a fan.) The air > flow through the transmission cooler is from the main radiator > fan. 1a) There is a small radiator attached on the outside bottom left of the main radiator that has hoses running to the power stearing fluid cannister. I assume this small radiator is cooling the fluid for power stearing and the hydraulic fan. There is also a round cannister down low that is between the driver's side of the engine and the main radiator with large diameter (3"+) hoses from the radiator and engine. There are also lines from the transmission. I'm assuming this is the transmission heat exchanger. I would assume water is flowing from the bottom of the radiator to the transmission cooler and then to the engine. Is this correct? 1b)I notice on this transmission cooler there are plugs on each end. Do these plugs drain the water or transmission fluid from the heat exchanger (or maybe both)? 1c)Should this transmission cooler be cleaned or serviced? > I think it comes on at 190 or so ... or whenever you turn on > the "fan override" switch > or turn on the dash AC. 2a) I believe my fan is "always on". When the engine temp is cool, the AC is off, and the fan override is off, should the fan be turning at idle speed or stationary? 2b) Is the speed of the fan proportional to the engine RPM? 3b) Where is the relay that the fan override switch controls? Thanks for your insight. Glenn Allen 1986 PT-40 Mar ietta, GA