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An auxiliary transmission cooler adds extra heat-shedding capacity, and Route 66 Auto Repair in Upland installs them for drivers who tow, haul or sit in summer traffic. Heat shortens transmission fluid life. Pulling a trailer up the Cajon Pass in July is one of the hardest jobs a transmission does. Our ASE-certified technicians help you pick a cooler that fits your vehicle and tow rating, then mount and plumb it so it gets clean airflow.
Who should consider an added transmission cooler?
- You tow a trailer, boat or camper, even a few times a year
- Your truck came without the factory tow package
- You carry heavy loads for work every day
- The transmission temperature reading climbs on long grades
- You plan a move with a loaded trailer behind your own vehicle
- Your fluid darkens faster than your service interval
How do we choose the right cooler?
Coolers come in different sizes and designs. Bigger is not always better: a cooler that is too large for a mild climate can keep fluid too cool in winter, although that is rarely a problem here. We look at your tow rating, the room in front of the radiator, and whether your vehicle already has a factory cooler we can work alongside.
Most add-on coolers are plumbed after the factory cooler so fluid passes through both. Before installing, we check the existing circuit for leaks and use a transmission fluid analysis to spot heat damage. If you are towing a U-Haul trailer, the separate Free Towing Inspection is a hookup check only. A mechanical check of your tow vehicle is a normal paid transmission condition inspection.
Our cooler installation process
Step 1: Talk about use
We ask what you tow, how often and where, and check your owner's manual tow rating.
Step 2: Inspect the current system
The fluid, factory cooler and lines are checked before we add anything.
Step 3: Mount and plumb
The cooler is mounted for airflow, and new hoses are routed away from heat and moving parts.
Step 4: Fill, bleed and test
We top off fluid, check the level hot and road-test while watching the temperature.
What's included in cooler installation
Included on the work order
- 01Use and tow rating conversation
- 02Pre-install check of fluid and factory cooler
- 03Auxiliary cooler, mounting hardware and hoses as quoted
- 04Hose routing and securing away from exhaust and belts
- 05Fluid top-off to the type your vehicle specifies
- 06Hot level check and leak check after the road test
Is an added cooler a need-now item?
Need now: call
- You leave soon on a long tow and fluid temperature already runs high
- Fluid already smells burnt from recent towing
Need later: book
- Adding a cooler before next towing season
- Upgrading a light-duty cooler on a truck that tows occasionally
- Pairing the install with a scheduled fluid service
What drives the cost of a cooler install?
Cooler size, mounting space and the hose length needed make the biggest difference. Some trucks have ready mounting points; others need brackets. The written estimate lists the cooler, the hardware and the fluid separately. AAA members save 10% on parts and labor, up to $75. Book ahead of a planned trip so the job fits the board without a rush.
After the install
Look under the front of the vehicle after the first few drives and check the fittings again after your first tow. Keep the cooler face clear of bugs and debris. Fluid still ages with towing, so ask us about a service interval that matches how you use the truck.
Frequently asked questions
Will a transmission cooler void my warranty?
We cannot speak for your warranty provider. Read your warranty terms or ask the dealer. We will give you an itemized invoice that shows exactly what was installed.
Does a cooler help if I do not tow?
It can help in heavy stop-and-go traffic or with frequent heavy loads. If you rarely tow or haul, keeping the fluid fresh usually matters more.
Can you install a cooler before my U-Haul trip?
Yes, if the board has room. Call a few days ahead. Remember to confirm current towing requirements on uhaul.com for the trailer you reserve.