Temps

[Pete Masterson]

I'm sure you did the right thing. On my maiden trip (home to CA from near Dallas via Denver) I ran into serious heat problems while climbing some long grades in eastern Nevada. Had a very very long day where I was pulling off to cool down, then heating right up again when I started up a grade. 

When I got to the Donner pass, during the morning hours, I had no particular heating trouble. But once I got home, I found a heavy duty radiator service and had the radiator pulled -- that's when I discovered that only the area swept by the fan was clear and everything else was fully clogged. 

Since the cost of pulling the radiator was considerable, I decided to go ahead and replace the core (with a new, more modern design that's supposed to be more efficient). 

Water temp hasn't been over 190 or so ever since. On that first trip, I spent half the time staring at the water temp gauge as it 'hung' at around 205 or so... 

I get in every year or so and give it a good washing out with simple green and a garden hose. A fair amount of nasty stuff comes out each time. 

There are solutions (that help) where you re-route the "slobber tube" (crankcase vent) that runs down the street side of the DD Series 60. Oily fumes will be pulled under the coach and back through the radiator by the fan. Add a little dust, and you have a recipe for oily concrete. One solution is to attach some plumbing to it to carry the fumes out the curb side. A more thorough (and expensive) solution is to get a filter system that catches the oil residue/mist before it leaves the tube.

Pete Masterson

'95 Blue Bird Wanderlodge WBDA 42

El Sobrante CA

"aeonix1@mac.com"

On Jun 18, 2008, at 6:59 PM, Mike McMahan wrote:

Thanks to everyone for their responses.  I just spent the last three 

hours cleaning the radiators on the bus.  It only has 88000 miles on 

it so I did not expect to find much but I was wrong.  I took the 

grill off and cleaned everything I could get to with greased 

lightning, Then low pressure water.  After about two cleanings really 

nasty water running on the ground I thouoght it was pretty clean.  

After looking a little closer I removed the ac  cooler and behind it 

on the ari cooler it was really nasty.  After cleaning this I put it 

all back together and started the engine.  There is a noticeable 

difference in the amount of air being pulled thru the radiator.  

There were no real symptoms of any of this being clogged up, bus ran 

fine and at proper temps.  I knew that going to Denver the high 

altitude air is enough thinner that it can reduce your cooling 

efficency.  Thanks again, Mike Mcmahan 96 42' Wanderlodge

--- In "WanderlodgeForum@yahoogroups.com", Leroy Eckert 

wrote:

Hi Mike. I was trying to help Glenn on his '86. I do not know much 

about the later models except some have a system with aux fans and 

the Alarmstat is called something else. 

However, my fan relay and fuse circuit is exactly the same as 

Pete's including the id numbers.

Sometimes these days my reading comprehension is suspect.

Leroy Eckert

1990 WB-40 Royale

Danlonega, GA

Smoke N Mirrors

--- On Wed, 6/18/08, Mike McMahan <mmcmahan@...> wrote:

From: Mike McMahan <mmcmahan@...>

Subject: [WanderlodgeForum] Re: Temps

To: "WanderlodgeForum@yahoogroups.com"

Date: Wednesday, June 18, 2008, 10:12 AM

            Thanks Leroy.  I guess I can't type either.  96 42' 

Wanderlodge

-- In WanderlodgeForum@ yahoogroups. com, Leroy Eckert  

Wanderlodge< jwasnewski@ ...> wrote:

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

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