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04-19-2006, 01:08 PM
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#1
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Member
Join Date: Nov 2003
Location: Gladstone,MO
Posts: 59
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While working on a friends 2000 W-20 workhorse MH air conditioner, I noticed that the electric radiator fan did not come on when I turned on the AC. Should it have or does it only come on when the engine gets hot enough?
Thanks in advance for your response.
__________________
Richard & Michêle Shields
95 Bounder 32H F53
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04-19-2006, 01:08 PM
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#2
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Member
Join Date: Nov 2003
Location: Gladstone,MO
Posts: 59
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While working on a friends 2000 W-20 workhorse MH air conditioner, I noticed that the electric radiator fan did not come on when I turned on the AC. Should it have or does it only come on when the engine gets hot enough?
Thanks in advance for your response.
__________________
Richard & Michêle Shields
95 Bounder 32H F53
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04-19-2006, 02:00 PM
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#3
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Moderator Emeritus
Winnebago Owners Club Workhorse Chassis Owner Coastal Campers Carolina Campers
Join Date: Jan 2000
Location: Conway, SC
Posts: 23,641
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by House Husband:
Should it have or does it only come on when the engine gets hot enough? </div></BLOCKQUOTE>The electric fans will come on at any time "after" the engine has achieved its operational temperature.
__________________
03 Adventurer 38G, Workhorse W22
F&R Track Bars, Safety+ , Ultrapower, Taylor Extremes, SGII
TST 507, Blue Ox, SMI, Koni FSD, CrossFire
RV/MH Hall of Fame - Lifetime Member
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04-20-2006, 06:37 PM
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#4
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Member
Join Date: Nov 2003
Location: Gladstone,MO
Posts: 59
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by DriVer:
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by House Husband:
Should it have or does it only come on when the engine gets hot enough? </div></BLOCKQUOTE>The electric fans will come on at any time "after" the engine has achieved its operational temperature. </div></BLOCKQUOTE>
So your saying that the fan does not come on with the air conditioner?
__________________
Richard & Michêle Shields
95 Bounder 32H F53
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04-20-2006, 11:55 PM
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#5
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Senior Member
Join Date: Nov 2005
Posts: 4,063
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">
So your saying that the fan does not come on with the air conditioner? </div></BLOCKQUOTE>
That is the way it works on my 95. The electric fan only comes on when it is needed as dictated by coolant temperature.
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Neil V
2001 Winnebago Adventurer WFG35U
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04-21-2006, 12:53 AM
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#6
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Senior Member
Workhorse Chassis Owner
Join Date: Sep 2003
Location: Webster, FL, USA
Posts: 240
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Actually the electric fans are supposed to come on when the A/C high side pressure switch closes. This is at about 235 psi. Here's what the 2003 Workhorse service information says...
Auxiliary Engine Coolant Fan A/C Pressure Switch (Commercial Diesels and all Motorhomes)
The air conditioning (A/C) fan pressure switch is located on top of the receiver dryer. The switch is normally open, but closes as a result of rising pressure. When the switch closes, the fan relay is energized. The switch requires 1620.3 kPa(235 psi)+/- 206.8 kPa (30 psi) to close.
I have noticed on my rig that at an idle, with the A/C on the fans will cycle on and off to cool the condenser and keep high side pressures in check.
__________________
Jim & Linda '03 Winnebago Adventurer 35U (W22) '06 Saturn Vue Toad
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04-21-2006, 01:20 AM
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#7
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Moderator Emeritus
Winnebago Owners Club Workhorse Chassis Owner Coastal Campers Carolina Campers
Join Date: Jan 2000
Location: Conway, SC
Posts: 23,641
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Horsepowerfan:
Actually the electric fans are supposed to come on when the A/C high side pressure switch closes. </div></BLOCKQUOTE>  That's right!
__________________
03 Adventurer 38G, Workhorse W22
F&R Track Bars, Safety+ , Ultrapower, Taylor Extremes, SGII
TST 507, Blue Ox, SMI, Koni FSD, CrossFire
RV/MH Hall of Fame - Lifetime Member
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04-21-2006, 01:27 AM
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#8
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Moderator Emeritus
Winnebago Owners Club Workhorse Chassis Owner Coastal Campers Carolina Campers
Join Date: Jan 2000
Location: Conway, SC
Posts: 23,641
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by House Husband:
So your saying that the fan does not come on with the air conditioner? </div></BLOCKQUOTE>No not at all. The fans directly support the air conditioning system and they can come on at any time when they are required (see horsepower fan's post above) to move more air through the condenser.
On the other hand the fans may also come on at anytime after the engine achieves its operational temperature via the "Auxilliary Engine Coolant Fan Temperature Switch" when needed as auxilliary cooling w/o the AC turned on. 
__________________
03 Adventurer 38G, Workhorse W22
F&R Track Bars, Safety+ , Ultrapower, Taylor Extremes, SGII
TST 507, Blue Ox, SMI, Koni FSD, CrossFire
RV/MH Hall of Fame - Lifetime Member
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04-21-2006, 04:38 AM
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#9
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Senior Member
Join Date: Jul 2003
Location: Commerce Twp, MI
Posts: 309
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So to summarize.
If the AC is on, the fan can(may) cycle on and off.
Also, if the engine (coolant) temps are high enough (such as climbing a long grade in 2nd gear) the fan may also come on even if the AC is off.
Did I get this right???
__________________
2012 Winnebago Adventurer 35P, Roadmaster F+R sway bars, Blue Ox Tiger Trac, 06 HHR toad
past:2003 Itasca Suncruiser 38G
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04-21-2006, 05:00 AM
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#10
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Moderator Emeritus
Winnebago Owners Club Workhorse Chassis Owner Coastal Campers Carolina Campers
Join Date: Jan 2000
Location: Conway, SC
Posts: 23,641
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<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by LandHo:
So to summarize. Did I get this right??? </div></BLOCKQUOTE> More important, I hope I got it right. 
__________________
03 Adventurer 38G, Workhorse W22
F&R Track Bars, Safety+ , Ultrapower, Taylor Extremes, SGII
TST 507, Blue Ox, SMI, Koni FSD, CrossFire
RV/MH Hall of Fame - Lifetime Member
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04-25-2006, 02:52 PM
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#11
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Member
Join Date: Nov 2003
Location: Gladstone,MO
Posts: 59
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Thanks Jim,
Your exact, precise response is exactly what I was looking for.
<BLOCKQUOTE class="ip-ubbcode-quote"><div class="ip-ubbcode-quote-title">quote:</div><div class="ip-ubbcode-quote-content">Originally posted by Horsepowerfan:
Actually the electric fans are supposed to come on when the A/C high side pressure switch closes. This is at about 235 psi. Here's what the 2003 Workhorse service information says...
Auxiliary Engine Coolant Fan A/C Pressure Switch (Commercial Diesels and all Motorhomes)
The air conditioning (A/C) fan pressure switch is located on top of the receiver dryer. The switch is normally open, but closes as a result of rising pressure. When the switch closes, the fan relay is energized. The switch requires 1620.3 kPa(235 psi)+/- 206.8 kPa (30 psi) to close.
I have noticed on my rig that at an idle, with the A/C on the fans will cycle on and off to cool the condenser and keep high side pressures in check. </div></BLOCKQUOTE>
__________________
Richard & Michêle Shields
95 Bounder 32H F53
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