Tech Tip PDFs
| Description | Item Id |
| Thermal Fan Clutch Diagnosis | HDTT304 |
| A/C System Lubrication Failures | TT305 |
| Wintertime A/C Operation | HDTT327 |
| Insufficient Airflow from the Dash | TT329 |
| Heater Core Failures | HDTT331 |
| Basic Electrical Testing | TT334 |
| Compressor Clutch Coil & Bearing Failure Diagnosis | TT336 |
| Shaft Seal Lubrication | TT339 |
| Why R&R the Accumulator or Filter Drier | TT340 |
| Compressor Shaft Nut Elimination | TT344 |
| Break Away Torque and the Spanner Wrench | TT346 |
| Restricted Discharge Line | HDTT348 |
| Electrolysis: a Major Cause of Heater Core Failure | TT350 |
| Evaporator Leak Tests | TT351 |
| Why Clean or Change the Expansion Valve When Replacing a Compressor? | TT352 |
| Cabin Air Filters | HDTT353 |
| Temperature Testing Methods | TT355 |
| System Sealers | TT370 |
| Inadequate Condenser Airflow | HDTT371 |
| Vacuum Terminology | TT372 |
| Condensers with Built-In Filters/Driers | HDTT382 |
| Compression Type Fitting Installation | TT421 |