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Chrysler 300 Automatic Transmission Oil Cooler Hoses

Chrysler 300 Automatic transmission oil cooler hoses

Starting at $12.95, AutoBuffy stocks 7 automatic transmission oil cooler hoses from Mopar and Four Seasons. This hose carries hot transmission fluid between the transmission and the cooler, keeping operating temperatures in a safe range. A cracked or leaking hose starves the transmission of fluid and causes heat buildup that leads to costly internal damage if ignored.

Signs your Chrysler 300 needs a new automatic transmission oil cooler hose

  • Red or brown fluid puddles forming under the front of the vehicle, near the radiator or cooler lines
  • Transmission fluid level drops repeatedly despite no visible external leak at the pan or cooler itself
  • Burnt or sweet smell coming from the engine bay while the transmission is under load
  • Transmission slipping, hesitating on shifts, or hunting between gears due to low fluid volume
  • Overheating warning or transmission temperature gauge climbing higher than normal, especially in stop-and-go traffic
  • Visible cracking, swelling, hardening, or wet residue along the length of the hose or at the crimped end fittings

Which automatic transmission oil cooler hose should you buy for your Chrysler 300?

The main decision is whether to use a direct-fit OE-style hose or a universal rubber/steel braided replacement. Beyond material, pay attention to whether the hose serves the pressure (feed) side or the return side, because wall thickness and fitting style differ. Matching the correct position and connector type ensures a leak-free seal without modification.

Direct-fit OE-style hose
Best for
Owners who want a drop-in replacement with no cutting or adapters
What you get
Molded or pre-formed hose with factory-matched end fittings, correct length, and routed shape for your specific application
Universal rubber cooler hose (cut-to-fit)
Best for
Budget repairs or hard-to-find applications where a direct fit is unavailable
What you get
ATF-rated rubber hose sold by the foot; requires hose clamps and compatible fittings, lower upfront cost but more labor
Stainless steel braided hose
Best for
Performance builds, towing applications, or engines with high under-hood heat
What you get
Reinforced outer braid resists abrasion and heat better than plain rubber; typically comes with swaged or AN-style fittings for a secure seal
Pre-formed hard-line with rubber ends
Best for
Applications where part of the original line is metal tubing with rubber sections at each end
What you get
Hybrid design that matches OE routing exactly; the rigid section resists kinking while the rubber ends allow slight movement and vibration absorption

Automatic transmission oil cooler hoses brands we stock for your Chrysler 300

Mopar
6 options · from $84.95
Four Seasons
1 option · from $12.95

Replacing automatic transmission oil cooler hoses on a Chrysler 300

Moderate⏱ 1–2 hoursDrain pan (transmission fluid safe)Line disconnect tool or flathead screwdriver (for quick-connect fittings)Hose clamp pliers or screwdriverCombination wrench setFunnel and correct ATF fluid for top-off

Place a drain pan under the cooler lines before loosening any fittings, as residual fluid will spill when the hose is disconnected. Slide or release the retaining clip at each end fitting, remove the old hose, and route the new hose to match the original path, avoiding contact with exhaust and sharp edges. After securing all fittings, refill to the correct fluid level, run the engine through the gear ranges, and check for leaks before returning the vehicle to service.

Frequently asked questions

How much does it cost to replace automatic transmission oil cooler hoses on a Chrysler 300?
Parts start at $12.95 on AutoBuffy. A direct-fit hose is typically a straightforward swap, so shop labor is generally low compared to other transmission jobs. Total cost depends on whether one or both lines need replacement and whether fluid needs to be topped off or flushed after the repair.
Can I drive my Chrysler 300 with a leaking transmission oil cooler hose?
No. Even a slow leak reduces fluid volume quickly under driving conditions. Low fluid causes the transmission to overheat and shift erratically, and prolonged operation without adequate fluid causes internal clutch and bearing wear that can total the transmission. Pull over safely and have the vehicle towed or repaired before driving.
How long do automatic transmission oil cooler hoses last on a Chrysler 300?
Most OE rubber cooler hoses last many years under normal conditions, but heat cycling, ATF exposure, and road vibration cause the rubber to harden or crack over time. Hoses routed near exhaust components or in high-heat engine bays tend to deteriorate faster. Inspect them any time the transmission fluid is serviced.
Do I need to flush the transmission fluid when I replace the cooler hose on my Chrysler 300?
Not always, but it is a good opportunity to check fluid condition. If the old hose failed because it overheated or collapsed internally, debris or degraded fluid may be present and a flush is worthwhile. If the hose simply cracked at a fitting and fluid is otherwise clean, top off with the correct ATF type and monitor closely.
Are both transmission cooler hoses the same on a Chrysler 300?
Usually not. One line is the high-pressure feed from the transmission to the cooler and the other is the lower-pressure return. They often differ in inner diameter, wall thickness, or fitting size. Always confirm which line you are replacing — inlet or outlet — and match the replacement to that specific position to avoid leaks or flow restrictions.
What type of ATF should I use when refilling after replacing the cooler hose on a Chrysler 300?
Use only the fluid specification listed in your owner's manual or on the transmission dipstick. ATF formulations vary significantly between manufacturers and mixing incompatible types degrades friction modifiers and seal conditioners. Adding the correct spec fluid after a hose replacement protects seals and ensures the transmission shifts as designed.

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