Chevrolet Sonic Repair Manual: Tire and Wheel Balancing (Road Force Variation (RFV))
- ALL wheel/tire assemblies must have a RFV within spec before being mounted on vehicle.
- RFV is unrelated to tire balance.
- RFV is identifying the stiff portion of the tire and determining if it is within spec.
- If RFV is too high, it will result in a vibration condition.
- Do not attempt to measure RFV on tires that have temporary flat spots. If necessary, drive the vehicle to relieve the flat spots.
- Prior to measuring for RFV, the tires must be inflated to the specification on the label.
- Passenger Cars (including Crossover Vehicles) = 18 lbs.
- Truck Tires: (P) - metric = 24 lbs.
(LT) - metric = 35 lbs.
- It is recommended that RFV measurements are made prior to installation of balance weights. Once adequate road force levels have been achieved, move on to balance the assembly.
Important:
If a wheel/tire assembly is not within the RFV specification after match mounting, the tire must be returned to the tire manufacturer. DO NOT install tire/wheel assembly on a vehicle if it exceeds the RFV specification.
Tire and Wheel Balancing (Collet Cone Selection)
Important: Never use the hub cap bore to center the wheel onto
the balancer. The pilot bore (on the hub side of the wheel) is machined
to be concentric to very tight non - standard tole ...
Tire and Wheel Balancing (Wheel Pilot Bore Greasing)
Beginning with MY 2011 vehicle, pilot bore grease should be applied.
To enable this, grease must be applied to the pilot bore to prevent the
wheel from seizing onto the hub.
Refer to Adhesi ...
Other materials:
Sunroof Window Seal Replacement
Removal Procedure
Remove the sunroof window panel. Refer to Sunroof Window Replacement.
Remove the seal from the window panel frame by pulling the seal away
at one point and continuing around the perimeter of the frame.
Clean around the edge of the inside surf ...
Special Tools
Illustration
Tool Number/ Description
EL?€‰38826
J?€‰38826
KM?€‰799-3
SIR Deployment Harness
EL?€‰39401-B
J?€‰39401-B
SIR Deployment Fixture
...
Coolant System Flushing
Note:
Do not use a chemical flush.
Store used coolant in the proper manner, such as in a used engine coolant
holding tank.
Do not pour used coolant down a drain. Ethylene glycol antifreeze is
a very toxic chemical.
Do not dispose of coolant into the sewer system or groun ...
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