Cowboy Grandpa
Colorado Springs, CO.
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I have a 2001 Fourwinds Infinity on a Ford Chassis. While going down the highway with the dash AC on. When I come to a hill the AC cuts off. I think the AC is cut off some how by a motor heat sensor, but when I check my temperture guage I see no raise in temperture. Is there a way I can disable this sensor and where is it
Thank you in advance for your help
JR
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don/lou
Brandon MB Canada
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You should check the vacume line going to the vacume pot sounds like it is leaking- or off no vac defaults to no A/C
Don & Louise
2000 Coachman Catalina 330 MSB /F53
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wny_pat
Western NYS
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Only a guess, it is probably vacuum operated, and when you are pulling a hill, the vacuum is needed elsewhere. You have a vacuum tank, and may have a bad check valve on it. The tank is suppose to hold the vacuum in reserve for moments like that.
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wolfe10
Texas
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A vacuum leak in the dash HVAC system will cause the air to come out the default position-- DEFROST.
Brett Wolfe
1997 Safari Sahara 3540
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Gale Hawkins
Murray, KY
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Cowboy Grandpa wrote:I have a 2001 Fourwinds Infinity on a Ford Chassis. While going down the highway with the dash AC on. When I come to a hill the AC cuts off. I think the AC is cut off some how by a motor heat sensor, but when I check my temperture guage I see no raise in temperture. Is there a way I can disable this sensor and where is it
Thank you in advance for your help
JR
This is just a passing feature on some vehicles to make it more safe so you can get the job done in a timely manner.
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D.E.Bishop
Eagle Rock, CA
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Go out and buy a MightyVac which is a hand held vacuum pump. Disconnect the vacuum line from the engine to the vacuum tank, hook up the MV an try to pull a vacuum. If you can't pinch off the vacuum line to the HVAC controls and keeping the MV connected to the tank try and pull a vacuum.If you can the tank is good and the leak is some where between the tank and the vacuum motors that control air flow and water flow for the HVAC. It is now a matter of finding the vacuum mainifold on the HVAC control panel and test eash of the vacuum lines and or vacuum motors.
It's kind of a PITA but the <$30.00 you'll spend for the vacuum pump is a lot less than $70.00 to $100.00 you'l pay a technician to do it.
"I travel not to go anywhere, but to go. I travel for travel's sake. The great affair is to go". R. L. Stevenson
David Bishop
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JR45
Warren/OR/USA
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Could be that you are low on coolant, bad water pump and when it gets hot cuts off the AC, is the only time that it happens on a hill or does it do it on flat ground. The gauges in the dash for most part just take up space and when they move it is to late, need something like the ScangaugeII that plugs into the OBDII port little hard to set up but it is plug and play for around $159 http://www.scangauge.com/support/compatibility/after-1996/
If you are trying to keep the AC on by bypassing something you may burn up the motor in the process.
JR
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garym114
Bluff Dale, Texas
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You have a 12v vacuum pump and a small vacuum tank. You should be able to hear the pump if you turn the ignition switch so the AC fan comes on without starting the engine and operate the knob that directs air to different locations.
Locate the pump and tank and make sure all hoses are on tight and not cracked. Could be the vacuum pump valves are getting dry. You can lube them with pneumatic nail gun oil. Remove the pump suction and discharge hoses and put a few drops of the oil in the suction port while the pump is running.
The pump is controlled by amount of vacuum on the suction side. Put your finger over the suction port with it running and the pump should turn itself off.
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Jerry B
Lake of the Ozarks
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Gale Hawkins wrote:Cowboy Grandpa wrote:I have a 2001 Fourwinds Infinity on a Ford Chassis. While going down the highway with the dash AC on. When I come to a hill the AC cuts off. I think the AC is cut off some how by a motor heat sensor, but when I check my temperture guage I see no raise in temperture. Is there a way I can disable this sensor and where is it
Thank you in advance for your help
JR
This is just a passing feature on some vehicles to make it more safe so you can get the job done in a timely manner.
Not on the Ford.
Jerry B
1996 Dolphin 535,F-53.
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dougrainer
Carrolton, Texas
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This is a COMMON problem on Ford and CHEVY (not workhorse) gas chassis. The Dash AC system duct controls are vacumm operated. This system is NOT air tight. When you accelerate or go up a hill and the engine then goes to ZERO vacumm, the vacumm reservoir does NOT have much reserve and the vacumm then leaks out and the default when no vacumm is to blow out the defrost. Once the engine is not at full throttle and is then producing vacumm, the air comes out the AC ducts again.
1. There is NO AC compressor kick out under ANY controls on any Class A chassis(NO such passing feature)
2. The Compressor stays ON during this problem. ALL dash AC controls stay as set except there is NO vacumm to run the controls.
3. You can add an extra vacumm reservoir, but this does NOT help if you lose vacumm for more than 1 minute
4. The ONLY sure fix is to install a 12 volt vacumm pump like Diesels use and plug the engine vacumm supply line. Doug
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