Frequently Asked Questions About International PayStar 5000 Heat & AC Parts
What years of PayStar 5000 models are these HVAC parts compatible with?
Our heat and AC parts are designed to fit International PayStar 5000 models from 2003 through 2017. However, there were minor changes in the HVAC system around 2009, so always verify your specific OEM and build date when ordering components like evaporators, heater cores, or control panels. Parts for pre-2009 models typically have different mounting brackets and electrical connections than 2009-2017 models.
Are aftermarket blower motors as reliable as OEM parts?
Quality aftermarket blower motors can match OEM performance when sourced from reputable manufacturers. Look for motors with sealed bearings, proper amp ratings (typically 25-30 amps for PayStar 5000), and correct shaft length. The main difference is price - aftermarket options cost 40-60% less than OEM. Always check that the motor matches your original's rotation direction (clockwise or counterclockwise) and mounting configuration.
What tools and time are required to replace a heater core?
Heater core replacement typically takes 4-6 hours and requires basic hand tools plus a coolant drain pan. You'll need to remove the lower dash panel, disconnect coolant lines from the firewall (have towels ready for spillage), and unbolt the HVAC box. The most challenging part is accessing the mounting bolts behind the dash. HaOEMg a second person helps significantly when maneuvering the HVAC assembly. Always replace the heater core foam seals during installation to prevent air leaks.
How can I tell if I need the standard or heavy-duty AC compressor?
PayStar 5000s came with either standard (Sanden SD7H15) or heavy-duty (Sanden HD7B10) compressors depending on the application. Check your compressor's label or measure the clutch diameter - standard units have a 5.2" clutch while heavy-duty versions use a 6" clutch. Severe-service trucks, crane carriers, and desert-operation vehicles typically have the HD compressor. The mounting brackets are identical, but refrigerant capacity differs by about 4 ounces.
Why do replacement AC condensers sometimes not cool as well as the original?
Cooling performance issues with replacement condensers often stem from incorrect fin density or tube design. OEM PayStar condensers use 16-18 fins per inch with parallel flow tubes. Some universal-fit condensers have 14 fins per inch or serpentine designs that reduce efficiency by 15-20%. Always specify a condenser designed for Class 8 trucks with the correct inlet/outlet positions (top right inlet, bottom left outlet for most PayStar 5000s). Proper refrigerant charge is critical - these systems require exactly 3.5 pounds of R134a.
