Tag: Mobile Climate Control

How to troubleshoot your A/C Electrical system

Tech Tips from Red Dot

On any vehicle, and virtually any A/C system, electrical problems are among the hardest to troubleshoot. If you suspect an electrical problem with the A/C system, here’s a two-stage inspection routine that virtually anyone can do with no special tools or skills:

1. Inspect Electrical Connections

As you perform a visual inspection under the hood (cab) and/or at the rooftop condenser, take a moment to check all electrical connections both visually and by feel. Make sure all leads and wires are properly supported and securely connected, and that there’s no corrosion or grime on the leads or connectors.

2. Check Electrical Current Flow and Device Functions

Perform the following steps to check current flow and electrical device functions:

  • Turn on the ignition. 
  • Turn on the A/C system. This will power the thermostat and clutch. If it does not come on, use the A/C mode switch to check the leads to the switch. You should hear a “click” from the thermostat and hear the clutch drive plate “snap” against the clutch pulley. 
  • Check fuses. If all the connections are clean and tight and there’s still a failure, check the fuses in-cab as well as in-line.
  • Check A/C clutch engagement. Since you can’t see and may not hear the clutch engage, get out and look at the clutch. If it’s engaged, you will see that the drive plate is against the pulley and not slightly spaced from it. If you aren’t sure the clutch is engaged, look for the lead wire connector near the clutch. Break and close that connection. The clutch will disengage and engage again.
  • Test blower speed operation. Some systems have a common switch that turns on the air conditioner and powers the blower motor. Test blower speed operation by adjusting this or the separate blower control switch. Feeling the air flow from the ducts or note blower sound (speed) changes.
  • Inspect roof-mounted condensers. Don’t forget to inspect roof-mounted condensers and A/C units for dirt and debris. Be sure the condenser fan(s) are working properly and all parts and electrical connections are securely fastened. The roof-mounted condenser fans may come on when the system is turned on. Like the thermostat and most clutches, the normal on-off cycling action can not be observed until the engine is running with the A/C system on.

Once your visual inspection is complete, talk to a qualified A/C technician about what you found. Your troubleshooting efforts will be rewarded with a speedier repair and perhaps a lower repair bill.

Thermistor Kit

What is a Thermistor ?
An electrical resistor whose resistance is greatly reduced by heating, used for measurement and control. Thermistors, derived from the term THERMaIly sensitive reslSTORS, are a very accurate and cost- effective sensor for measuring temperature. 

Your HVAC Thermistor can be replaced with #1400K for Quicker Installation and Less Hassle! 
Our Kit contains “First Fit OE Products”  for longer life solutions to today’s A/C problems.
Check out the video courtsey of MEI here ….

International & Prostar HVAC Thermistor Kit for quick hassle free replacement of OEM part.

Cabin Air Filters – Increase A/C efficiency and Reduce dust, dirt and allergens

A relatively new feature in the heavy duty industry, the cabin air filter is often overlooked in regular vehicle maintenance. That’s unfortunate because the cabin air filter is just as important to the passengers as the engine air filter is to the vehicle and a likely cause of “A/C Not Blowing Cold“. A cabin filter processes the air that enters the passenger compartment via the vehicle’s heating and air conditioning system, increasing passenger comfort by trapping particulates, pollen, and other irritants.

For people with allergies and other sensitivities to airborne agents, the cabin filter represents a significant advance. Replacing the cabin air filter at the recommended interval, or sooner especially in areas of high particulate, allows the A/C system to run at optimal efficiency and passengers to breathe cleaner, fresher air, which makes any journey more enjoyable – Courtesy of Denso Corporation


Arctic Traveler Canada  carries a complete line of Off Road/Agricultural Cabin Air Filters. Call 1-800-295-4156 for more info.

How to use ATC Connect

Parts lookup. We made it easy and only a few key strokes away

How to Login:

From the home page of our ATC websiteATC is your gateway to a wide range of mobile heavy duty HVAC parts for commercial, industrial and On/Off road applications like agricultural, construction, forestry and mining.

In the Lower Right corner, Click On CUSTOMER LOGIN

ATC Connect is parts look up made easy and your gateway to a wide range of mobile heavy duty HVAC parts for commercial, industrial and On/Off road applications like agricultural, construction, forestry and mining.

  Enter Your Username and Password

Welcome to ATC CONNECT

Mobile Heavy Duty HVAC Parts Lookup for commercial, industrial and On/Off road applications like agricultural, construction, forestry and mining. ATC Connect, We Made It Easy.

Note the OEM Number Search, ATC Number Search & Part Description Place Holders at the top of the page.

 

Parts Lookup

In the Top left hand corner of the page, select Parts Lookup.
Mobile heavy duty parts lookup for commercial, industrial and On/Off road applications like agricultural, construction, forestry and mining. 

The Part Search drop down will appear. Select the Make
Heavy duty HVAC parts by type or make, model and year.

 The MAKE selection for this example is Freightliner, then MODEL (Columbia), then choose the YEAR
ATC_Parts_Search_Freightliner_example

All available parts by type for the Freightliner, Columbia, 20xx will be displayed including ATC Item Number. OEM cross reference number and On-Hand Inventory.  Click on the desired part to display detailed specs.

No Price is displayed, but specs on the part will be as well as availability and quantity by location.

Please note this inventory by location is only updated once daily, overnight and depending on the time of day and demand for the item, on hand Inventory could be depleted.

To return to the main menu at anytime, click on the ATC Logo.

ATC Catalogs – Order yours today

With so much information at your finger tips these days, we know Catalogs still have their place and preference. Order yours here or get access to our new parts look up and cross reference tool ATC Connect, or simply use our product line catalogs on our ATC website. Whatever your preference, we’ll ensure you find and have the right part.

Heaters- Troubleshoot from the ground up

RedDot
Quick Heater Service Tip from Reddot
  • When the status is “heater fan doesn’t work,” check the ground connection for rust, paint, grime, or some other obstruction at the terminus.
  • If the motor doesn’t have a ground wire, its mount serves as a ground connection. Make sure nothing impedes the mount’s ground path.
  • Use a multimeter to make sure you’re getting full voltage to the motor. Once you know the voltage is adequate, you can then look for worn brushes, dirty squirrel-cage fans, damaged fan blades, and other more typical motor problems.