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Old 09-19-2015, 05:05 PM   #1
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1991 StarCraft diesel 370ur

Stsrcraft 370 ur coach diesel Hello. If there is anyone out there who has one of these rv's I need some help. My dash controls for the defrost and heat and vent have no vacuum on their lines to actuate the Louvre doors. If I supply an external vacuum to the line they function properly. I traced the vac line to the front near my ac condenser coil where I found a red plastic air line disconnected. I dont know where it screws on, somewhat a mystery. I've had no success with StarCraft to get info. If someone should have one of these I could use a pic under your front hood of the right side area near the ac condenser. A pressure regulator with a red air line and 2 black hoses are there. Thanks.
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Old 09-20-2015, 01:44 PM   #2
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As you know,diesels don't create vacuum, so a small electric vacuum pump supplies the vacuum to operate your HVAC system. The vacuum pump is usually located under the windshield on the bulkhead in front of the RV. I'd try to find the pump and see if it's working. If you open the front hatch and stand there when someone turns the key on (but not start) you should hear the pump running.
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Old 09-21-2015, 02:51 PM   #3
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Thanks for the reply. No I did not realize no vacuum for a diesel. Someone previous to me must have removed my pump. I only see a red plastic line with a nut and a ferrull hanging loose. I couldn't see where it went to. Are these pumps easily found for sale?
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Old 09-21-2015, 07:19 PM   #4
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Yes, since it's only needed for the HVAC, not brakes or windshield wipers, this one would probably do it:

http://www.amazon.com/Karlsson-Robot.../dp/B00DYA21PU

They are found many places:

12V Vacuum Pump | eBay
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Old 09-21-2015, 09:42 PM   #5
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My 89 has vacuum pump on engine, but my brakes also use a vacuum booster.
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Old 10-13-2015, 10:46 PM   #6
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I currently have a 1991 Starcraft M370UR with all of the manuals, original sales brochure, and Starcraft owners VHS tapes. The original Starcraft system consisted of a bleed air venturi valve that used air system #1 air with a 70 PSI cutoff to create vacuum to run the heater controls and cruise control system (the original system consisted of Ford parts). The valve was located under the hood on the drivers side by the air #1/#2 pressure tap manifold. Since this system continually uses air pressure to operate most have removed the valve, capped, and replaced with an electric vacuum pump. A good source for vacuum pumps will be Summit Racing or Jeg's (in addition to those currently listed by other posts) - they will also carry a vacuum canister which will be required. The electric pump can be mounted above the hydraulic leveling system and vacuum canister in place of the current round canister that is mounted above the window washer reservoir.

I hope this helps.

Jim
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