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Old 12-26-2009, 11:58 AM   #29
Kenneth
 
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1987 34.5' Airstream 345
Waxahachie , Texas
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Thanks guys. That's a guud idea. I will get an infrared guage and find out what the actual temp is first, then try and find the correct sending unit.
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Old 12-29-2009, 08:41 AM   #30
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1991 25' Airstream 250
Oxford , Oxfordshire
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We had a problem with an intermittent fan clutch on our 250 Motorhome. We replaced the fan clutch with a Torqflo severe heavy duty unit Fan Clutches

from Autozone for about 60 bucks. We now run at a steady 180. Clutch kicks in if we hit 200 on hills/traffic etc, works a treat and takes us back down to 180 in a couple of minutes.

Note that we replaced upper and lower hoses and fan clutch without removing radiator etc. It really wasn't that difficult although there was two of us. One under passenger wheel arch and the other via the dog house. You can just about reach everything. Be careful not to damage the radiator when you remove the fan.

A friend has the electric fans and is now thinking of switching back to the fan clutch. Some of the forum members kindly shipped the stuff over to the UK for us (we love you guys).

Merry Christmas

Boom Sounds
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Old 12-29-2009, 10:16 PM   #31
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1989 34.5' Airstream 345
Jamestown , Kentucky
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hello Boom Sounds

would it be an advantage to also chanf the OEM fan to a more efficient one made by yjr link you posted ??? just wondered if you researched, or if some one has been able to improve performance ???? with an aftermarket clutch and new fan ???
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Old 01-02-2010, 06:31 PM   #32
Kenneth
 
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Thanks Boom Sounds,
What is the hottest outside air temperature you could be driving your MH in?
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Old 01-03-2010, 08:20 AM   #33
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Southern France can get over 40 C (that's 105 in your speak). However, it's worth noting that I am in a 1991 250 MH which is significantly lighter than your 345.
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Old 01-03-2010, 08:30 AM   #34
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I did look at the options on the fan clutch. My conclusion was that the Torqflo gave the best bang for the buck. I haven't researched fan clutch plus electric fans (not sure if you have enough room). However, one could conclude than any drop in temp must improve MPG. Over here, the biggest MPG difference can be delivered by a propane conversion which is tried and tested on the 454. You need to rack up quite a few miles to make the payback, but I've seen a 250 run on dual gas and propane and it seems to work well. Peculiarly, it seems easier to fit the extra tank on the short 250 because we have a single exhaust running on one side of the chassis rail......which gives you space on the other side without moving anything around. LPG is half the cost of gas in Europe.
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Old 01-03-2010, 09:08 AM   #35
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1989 34.5' Airstream 345
boca raton , Florida
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Manual fan switch

I generally run at 220 or a bit higher in temps over 85 degrees. The fans are on a manual switch the previous owner installed and I have found that they do not do much when running highway speeds. In slow traffic they are worth their weight in gold. Not sure how to over ride the system, but find someone who can and add a toggle switch to the dash. Mine did not work at time of purchase, so looking at the wiring to the fans, found an inline fuse had blown. When I put on the fans, can tell by a tempory drop in the voltage guage on the dash. My guess the fans are connected to the engine air system that I do not use.
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Old 01-03-2010, 08:03 PM   #36
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Interesting. Would you say that they (fans) were apart of the A?C system or just for helping to sool the engine? I am definately going to put a manual switch on them. They have never came on by themselves.

Boom Sounds. Thanks so much for your help. I have already contacted the fan clutch folks to see if they can recommend a product for me. You have been so helpful..
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Old 03-20-2010, 04:37 PM   #37
Kenneth
 
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Well after our last trip last weekend and the temperature guage reading between 240 and 260 I finally bought an infrared temperature gauge. I found that when the coach gauge reads 220, the infrared reads 170 pointing to the thermostat housing, which is where the temp sending unit is. Now I just need to find a source that match me a sending unit with the guage in the coach
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Old 03-20-2010, 05:09 PM   #38
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Quote:
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... Now I just need to find a source that match me a sending unit with the guage in the coach
I got mine from these folks: Home Page

The first one I got from NAPA gave really high (inaccurate) readings.
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Old 03-21-2010, 11:17 AM   #39
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Thanks Guy99. I'll give them a call first thing tomorrow
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Old 03-21-2010, 02:51 PM   #40
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oil cooler

As I set here in New Orleans for the last 3 month. This has been my home while I've been volunteering to help rebuild NO.

It you look you can see the air dam and added engine oil cooler under the front bumper I built. I had the transmission cooler in front of it, but couldn't get enough air to keep the tranny cool, so moved it back in front of the radiator. With this setup the clutch fan don't come on very often, which leaves more power to get down the road.
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Old 03-21-2010, 04:37 PM   #41
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You know, that's interesting. I look behind the bumper and see all of the coolers and fans, etc that are located in front of the radiator. It's no wonder its difficult to get good air flow. What did you make the air dam out of?
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Old 03-22-2010, 06:50 AM   #42
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You know, that's interesting. I look behind the bumper and see all of the coolers and fans, etc that are located in front of the radiator. It's no wonder its difficult to get good air flow. What did you make the air dam out of?
Aluminum flashing and aluminum angle iron and pop rivets. The cooler has a thermostat controlled fan. It only switches on about the time I shut the engine off. I think the air dam helped the air flow through the radiator also.
Maybe I'll remember to take a closeup of the dam today.
Just figure out how to post pictures.
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