Diagnostics & Services | Ventura, CA | Dave Wilkes Transmissions

Diagnostics & Services

Transmission Servicing – Ventura, CA

Initial Basic Check

We begin all transmission Maintenance Services with a Basic Check. If you have a specific symptom or concern, please tell us so we can check the vehicle first before performing the service. If we notice anything we will bring it to your attention.

  • Road test the vehicle before the service to check for normal operation and experience any customer concerns.
  • Make minor adjustments if needed.
  • Check the fluid level and condition. If it is low, there may be a leak to locate.
  • Perform a visual inspection.
  • When the transmission pan is off, check for any indication of a problem.
  • After the service, road test the car again and recheck the fluid to make sure it is at the correct level.

A simple as this sounds, checking the transmission is not normally included at other repair facilities when they service a transmission.

Transmission Flushes

If you are going to change the fluid in the transmission it only makes sense to change all of it not just half of it. Flushing the transmission with the pan off is the best way to do that. This is a brief, simplified explanation of that process.

Basic Fluid Circulation

The fluid in the transmission is in two areas, the pan and the torque converter. When the motor is running the normal circulation begins at the suction side of the pump, which draws the fluid from the pan through the filter. Then the pressurized fluid goes into the torque converter, through the transmission cooler lines to be cooled. Then the fluid goes through the transmission and falls back into the pan.

Fluid Circulation

Pan Service

When the pan is removed this drains about half of the fluid and allows us to inspect and clean the pan and change filter, (some transmissions have a screen that isn’t replaced), and the pan gasket,(some transmissions have a molded pan seal that is not replaced unless damaged or leaking).

Pan Service Dirty Pan Clean Pan

Pan Off Flush

The other half of the fluid stays in the torque converter. Most torque converters don’t have a drain. We replace the fluid in the torque converter by connecting a machine (Trans-Action 2.0) that provides new fluid to the transmission pump then we start the engine. With the engine running and using the normal fluid circulation, new fluid is circulated through the torque converter, transmission cooler & lines, through the transmission and clutch packs. Then the old fluid leaves the transmission while the pan is off and does not mix with the clean fluid being added. The machine does not force fluid through the transmission, it simply provides new fluid to pump so the normal circulation does the flushing. We normally flush using 2 gallons of fluid while the pan is off. We are the only ones I know of in Ventura that performs a “Pan Off Flush.”

Pan Off Flush Pan Off Flush

Pan On Flush

The most common flushing method at other servicing facilities, repair shops, fast lubes, and dealerships is done with the pan on. A cooler line is disconnected that goes to the transmission cooler in the radiator. When the motor is started the old fluid leaves the transmission through the pressure line into the machine and then the machine adds fluid through the return line. The filter is not replaced and the new fluid is mixed with the old fluid that is in the pan. This is a less effective method of flushing than our “Pan Off Flush.”

Pan On Flush

Call us today at (805) 656-7605 or schedule an appointment online for your basic diagnostic check and see why we are the best transmission repair shop in Ventura, CA!