A driver who cannot sleep in the bunk or see through a fogged windshield is not a comfort complaint — it is a safety and retention problem. KG Truck Services repairs truck heating and air conditioning in Mississauga: cab A/C, heaters, blowers, condensers, evaporators, and sleeper climate systems on Freightliner, Peterbilt, Kenworth, Volvo, Mack, International, and Western Star. We find leaks, recharge correctly, replace failed components, and diagnose the electrical side so you are not adding dye and hoping.
Air conditioning that actually gets cold
“Needs a recharge” is a symptom, not a diagnosis. If the system is low, the refrigerant went somewhere. We leak-test with the right tools, inspect compressor clutches, check high and low side pressures, and look at condensers that are packed with dirt from a winter of slush. A compressor that has been run dry of oil will take the new charge with it. An orifice tube or expansion valve that is restricted will ice one moment and blow warm the next. We repair the cause, evacuate, recharge to spec, and verify vent temperature with the truck at idle and at RPM — because a system that only works at 1,500 rpm is not fixed.
Electrical HVAC faults are common on late-model trucks. Blend-door actuators, control modules buried in the dash, pressure switches, and CAN-bus climate modules will throw codes and leave the driver with one temperature no matter where the knob sits. This is why HVAC sits next to our electronic diagnostics specialty. We scan the climate module instead of replacing a compressor that was never the problem. If a control head needs programming after replacement, we do that here.
Heat, defrost, and sleeper units
No heat with a warm engine is usually coolant flow, a heater control valve, air in the system, or a clogged heater core — not “the thermostat,” though we will check that too. Defrost that will not clear glass is airflow: cabin filters, blower motors, and mode doors. In Ontario winters those are not optional repairs. We also service auxiliary heaters and bunk A/C. A sleeper unit that will not hold a setpoint turns a 10-hour break into a bad night and a driver who starts looking at other companies.
After engine work, HVAC often needs a second look. A rebuild that opened the cooling system can leave air in the heater core. A job that moved condensers or accumators can leave a charge low. If you are already in for an engine rebuild or a major cooling-system repair, ask us to verify cab heat and A/C before the truck leaves. It is cheaper than a comeback in July.
In the shop or at the yard
Most A/C recover, leak-test, and recharge work is done in the bay where we can recover refrigerant legally and weigh a charge. Some no-heat and blower jobs can start as a mobile call if the truck cannot come in. Either way, describe the symptom: no clutch, blows warm, only the bunk, only on the highway, or a stored climate code. That information cuts diagnostic time.
KG is at 6771 Columbus Road, Mississauga. Call (905) 564-0880 to book HVAC. Bring the truck before a heat wave or a freeze if you already know the system is weak. Waiting until the cab is unusable is how a $300 leak becomes a compressor, a condenser, and a missed load.
