Used Guide: 2005-2014 Ford Mustang Convertible

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The Michigan-built fifth-generation Ford Mustang debuted in 2004 for the 2005 model year, and was available in both coupe and convertible body styles, straight out of the gate.

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Though updates and enhancements were applied to its looks and powertrains across this generation, the 2005-2014 Mustang stayed true to the machine’s roots, offering both automatic and manual transmission options, coupe and convertible body styles, and a variety of 6- and 8-cylinder powertrain configurations to suit a wide range of needs and tastes.

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Various high-performing and special-edition models like the Boss 302 and Shelby GT500 were also available, helping add selection to the lineup.

When considering a used Mustang Convertible from this generation, shoppers can take a few steps to help bolster confidence in their purchase decision. We’ll highlight those steps below.

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Set Yourself Up

The long-term reliability and dependability of a used car can often be accurately predicted based on how that vehicle was maintained and cared for throughout its life. This becomes especially important when considering buying a vehicle that’s, at minimum, 7 years old.

The most reliable and dependable used Mustang Convertibles will tend to be the ones that have been religiously maintained and inspected by their servicing dealer, and not subjected to aftermarket modifications — which can be a cause of problems and headaches in some situations.

When shopping for a used Mustang Convertible, seeking out a unit with a clear service history and full maintenance records is ideal. A single-owner model that’s been regularly serviced by a Ford dealer is typically best. For maximum peace of mind, you want to buy a used Mustang Convertible with as few ‘question marks’ about its history as possible.

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Many shoppers of second-hand performance models will preemptively opt for a full tune up, fluid change, and filter change at the time of purchase if the vehicle’s service history is unclear. In this way, these owners take confidence in starting their experience from a ‘fresh slate’ when it comes to fluids and maintenance.

Make Some Assumptions

Making a few assumptions about the used Mustang Convertible you’re considering can help prevent headaches and save you money.

For instance, approach any used Mustang Convertible you’re considering assuming that it’s in need of a new clutch (if applicable), tires and brakes, until you confirm otherwise. As a performance car, these parts are always suspect when shopping second-hand.

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Most sellers aren’t hoping to stick you with the upcoming cost of replacing tires, brakes or a clutch, but some are — so a careful inspection before you buy can save you money. If you’re not sure how to assess the condition of a vehicle’s tires, brakes or clutch, be sure to ask for assistance from a friend or relative familiar with the car, or, from a technician during a Pre-Purchase Inspection (PPI).

Transmission Trouble

Some owners have reported transmission trouble from this generation Mustang. Many have not.

Earlier units from this generation, and especially those units with V8 power, should be carefully scrutinized for proper operation of the manual transmission. Some owners report a gearbox whine, difficulty shifting smoothly, or a shifter that likes to ‘pop’ out of gear, as possible warning signs of trouble.

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If the manual transmission grinds, slams, clunks or ‘bites back’ during a shift, proceed with caution, plan a professional inspection of the transmission, or move to another unit.

Convertible Checkup

Convertible Mustangs run a motorized soft top that opens and closes in seconds, at the touch of a button. On your test drive, be sure to open and close the roof, several times. Be on the lookout for any sudden reversal in direction, any unexpected stopping of the roof’s motion, or any signs or sounds of binding, straining or slamming in the process. These can indicate trouble.

Stop the convertible roof part-way open, and then exit the vehicle and inspect it carefully. You’ll notice a series of rubber weather seals on the roof, as well as the vehicle body. These rubber seals should be plump, fresh, and intact—not dried, cracking, or missing. With the roof fully exposed, it’s also easy to check for signs of rips or tears in the fabric top.

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Abrasion to the top material may also indicate some unwanted rubbing of one or more components against the roof fabric while the top is in motion. This can indicate the need to have a dealer technician make some adjustment to the convertible top mechanism.

Convertible top seals may require occasional lubrication and conditioning to ensure a long life, and to help reduce friction between moving parts which helps make for a better seal and longer convertible top life. The owner’s manual has the full scoop.  

Convertibles also use a network of drainage channels and tubes to help direct rainwater away from the roof, allowing it to drain through special pathways built into the vehicle body without entering the cabin. These channels and tubes may require periodic maintenance to clear away dust and debris that can clog the body drainage system over time. Failing to keep this drainage system clear can cause problematic water leaks into the vehicle cabin.

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Ask the seller when they last cleaned the convertible drainage system, and plan to do this about once a year during ownership, to help mitigate the chances of a water leak. Some owners use compressed air or a length of weed-whacker wire to clear debris and dust from within the drainage tubes.

In summation: ensuring the Mustang Convertible’s roof drainage system and weather seals are in good shape are key ways to fend off water leaks and expensive trouble.

Signs of an existing water leak include a musty or mouldy smell inside of the vehicle, wet or mouldy-smelling footwell carpeting, or signs of moisture or standing water beneath the Mustang’s trunk. Buying a used Mustang Convertible with any signs of an existing water leak is not advised.

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Battery Care

A fresh battery in your second-hand Mustang can go a long way towards fending off headaches.

First, weak or dying batteries can cause irritating issues with convertible top operation, even if the battery starts your Mustang’s engine just fine. A weak battery can also cause a multitude of problems with other vehicle systems that rely on consistent power to do their jobs properly. 

Cars like the Mustang Convertible are often parked for extended periods when not in use, which can shorten the useful lifespan of their battery as well. 

Consider having the battery in the Mustang Convertible you’re considering inspected at the time of your purchase, and replace it with a fresh unit if needed. Note that regular use of a trickle charger while your Mustang Convertible is parked for extended periods can help prolong battery life and prevent irritating malfunctions. 

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Make some New Friends

The Ford Mustang is one of the most popular sports cars in the world, and the Ford Mustang online owner’s community is a vast one. 

Shoppers considering their first Mustang Convertible can consider joining an online Mustang forum or Facebook group to connect with existing owners. These groups can be a wealth of information for potential shoppers looking for more information, with many members happy to share their experiences and advice with potential new owners. 

Final Thought

These tips are designed to help test-driving shoppers more easily identify possible trouble areas reported by some Ford Mustang Convertible owners. An attentive test-drive and shopping process that focuses on the areas above can help you find a first-class example of a second-hand Mustang.