Category Archives: #off road vehicles

Section 609 important information


If you still have questions about Section 609 certification please review our list of frequently asked questions by clicking here.    

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MACS Training Clinic in Watertown, SD


Many thanks to MACS member Lake Area Technical Institute for hosting a capacity crowd at their training center Friday, March 23 for a MACS mobile A/C heavy duty best practices class. MACS training classes are happening all Spring see the … Continue reading

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Tata Motors and MAHLE partner together to develop a prototype Secondary Loop Mobile Air Conditioning System on a vehicle


Tata Motors Limited and MAHLE, one of the world’s 20 largest suppliers to the automotive industry, have signed a joint development agreement for designing and developing a Secondary Loop Mobile Air Conditioning System (SL–MAC), under the aegis of United Nations … Continue reading

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MACS AG HVAC clinic in Norfolk, NE


MACS held our first ever agricultural HVAC clinic at MACS member Northeast Community College in Norfolk, NE on Friday, March 24 attended by 31 technicians. MACS wants to thank Doug McKibbon of Northeast Community College for his invitation to use … Continue reading

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Truck heater control valves


By Chris Tyson, MACS heavy duty contributor We have several Class 8 trucks in our fleet and when temperatures begin to drop outside many of their owners visit our shop for heater-related repairs. That’s exactly what happened when the operator … Continue reading

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New EPA rule allows R-1234yf in certain trucks


By Steve Schaeber, MACS Technical Editor If you’ve been waiting to see R-1234yf in something larger than a ½ ton pickup truck, you might not have to wait too much longer. A new EPA rule that was just signed last … Continue reading

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A fleet for field work: servicing specialty equipment


By Stephen Petit, Siefkes/Petit Communications In heavy-duty A/C work, the service vehicle is essentially a shop on wheels — it’s vital for reaching equipment that operates virtually around the clock or can never see the highway. NVB Equipment in Fresno, … Continue reading

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Change is coming to heavy duty refrigerants


By Steve Schaeber, MACS manager of service training Last year around this time the US Environmental Protection Agency (EPA) finalized Rule # 20, which was a Change of Status Rule affecting several industrial sectors including MVAC (Motor Vehicle Air Conditioning). … Continue reading

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Servicing heavy duty truck, off-road and specialty vehicle A/C


By Robert Brocx The heavy duty truck, off-road work machine and specialty vehicle mobile air conditioning (HD MAC) industry has typically utilized air conditioning standards, procedures and technologies developed by the automotive industry and SAE Interior Climate Control Standards Committee … Continue reading

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Do you know how to handle A/C for off highway vehicles?


  Like the light duty world, most heavy duty HVAC systems are tested using a laptop and specific software. However, the Freightliner M2 Business Class Truck HVAC controls and blower motor circuits can still be checked using common items found … Continue reading

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