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Old 05-02-2016, 01:14 PM   #1
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Alpine dash air 2002

I purchased this unit used the dash air did not work. A shop in OKCity replaced the compressor,dryer,expansion valve. With the aid of a large fan on the radiator they were able to recharge the system. The problem that I have is the fan does not come on with the air turned on. The hydraulic driven fan worked with the engine temp. I am unable to find any way that the fan comes on with the air turned on. Any help will be greatly appreciated. Thanks emccoy

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Old 05-02-2016, 01:36 PM   #2
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Do a search on "wax valve" on this forum--there is literally hours of reading on this subject. The "short version" is that 2003 and earlier Alpines were designed with a mechanical wax valve to control the engine fan. Newer Alpines use an electronic fan interface. On the 03 and earlier, the valve opens and closes based purely on the diesel engine's need for cooling--there is no interface with the dash A/C. Reviewing the specs on the wax valve suggests that it maintains limited RPMs but the fan on my 03 will not turn until the engine calls for cooling via warm coolant in the radiator.

Accordingly, the only air flow across the dash A/C condenser on your radiator stack is limited to ambient flow at highway speed or if the engine is warm enough to open the wax valve and activate the fan. After market solutions include: 1] an electric solenoid place inline to the fan motor fluid controller line that is linked to the dash A/C controls; 2] if enough room for it, adding an electric fan to the outside of the stack--again, linked to the dash A/C; or 3][as I did] move the condenser forward to clean air and add electric fans, and again, link it to the dash A/C.

You can PM me on this forum if you would like to discuss this issue in detail, and/or to discuss possible solutions.....

Old Scout
2003 40' MDTS
Garden Ridge, Texas
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Old 05-03-2016, 08:00 AM   #3
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Location: Simi Valley, Calif
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Old scout
There is also another solution. Source engineering has designed an orifice that is placed in the hyd line between wax valve and hyd fan motor. It design allows the fan to turn at approx 350 to 400 rpm anytime engine is started to pull air over condenser to keep a/c head pressures down. Wax valve will operate normally for engine cooling. Price is about 30-40 dollars and takes about 30 min to install. Most time is tracing hyd line to identify correct line
Sandy and Debi
2004 Alpine 36 FDDS
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Old 05-03-2016, 03:27 PM   #4
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OOPS--forgot about the reducing orifice.....Guess my bias remains with moving from use of the 25 hp engine fan motor to create air flow for the dash A/C, to installing electric fans of some config. to respond directly to the A/Cs needs for condenser cooling....
Old Scout
2003 40' MDTS
Garden Ridge, Texas
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dash, dash air

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