I'm planning to trade in my car on a newer model. My decision to go ahead and do it soon was based on the fact that I had several expenses and maintenance tasks coming up soon: registration, tires, flaky AC. For a trade-in, what kinds of maintenance and repairs generally make economic sense? Is it worth my trouble to remove my political bumper stickers? To get the interior professionally cleaned? To replace the tires or fix the AC? We're talking about a 2010 Honda Fit with a bluebook value of about $3-4k.

  • I would say don't do anything extra, the dealer will likely undervalue it anyway. Commented Jul 10, 2018 at 4:36
  • 1
    Most of the things you list are normal consumable items and you can add wipers, lights, additional floor mats - if you keep them in good condition then they do help the value of the car when you trade it in - if the mats are knackered, tires well-worn etc then that is why the dealer gives you the lowest price possible... But why run around on nerly bald tires - it is putting your safety in jeopardy and others as well...
    – Solar Mike
    Commented Jul 10, 2018 at 18:58
  • For the flaky AC thing you can do a simple check yourself: with engine turned off and keys in your pocket, reach the compressor's clutch hub with your hands and turn it. You'll immediately know if your compressor is still good (smooth and uniform resistance across one whole turn).
    – Al_
    Commented Jul 11, 2018 at 18:38
  • @Al_ that assumes that the clutch is engaged. The pulley can spin quite nicely when disengaged from the compressor, even if the compressor is completely seized.
    – 3Dave
    Commented Jul 14, 2018 at 19:50
  • @3Dave You're wrong. The clutch hub (the plate in front of the pulley) is always mated to the compressor shaft, be the clutch engaged or not. If you're rotating the hub with your hands, you're rotating the compressor shaft. You need to rotate the pulley only if you want to check the pulley bearing. We're not talking about a clutch assembly for very large displacement bus AC compressors, where the pulley is often located in the front, and therefore you can only rotate the pulley with your hands (and never the "rotor" behind and thus the compressor's shaft), unless the coil is being powered.
    – Al_
    Commented Jul 15, 2018 at 11:50

3 Answers 3


Honestly, don't do it. The ROI on doing maintenance before a trade in is negligible. Most dealers don't car about the tires on the car as long as there are tires on the car and they are not dangerously bald. Things like making the car look nice might add some additional value, but again the ROI would be low.

If you really wanted to see if you can negotiate a better deal for the car, bring it in as it and ask how much they would give you for it. Then ask how much would the give you for it if you did such and such. This would give you an idea which maintenance items are worth it.


The only time it's worth putting money into a car to trade it is if the money you get is more than the money your spend. If you have a car that's not running then getting it running makes the trade in value much higher, so can be worth it depending on how much it costs. Other than that, cleaning a car so it's not filthy makes sense but not paying for it to be professionally detailed. Putting new tires on costs you lots money but won't get you anything more on the trade in price, because the dealer can do it cheaper than you.

The most important thing is to know what your car is worth as a trade-in and be prepared to negotiate for it. Dealers will often give you a trade in far below value to maximize their profits, so know your stuff and be willing to stick to your guns.


Among everything you said, i would personally fix (and also tweak: things such as AC line soundproofing so you don't hear the compressor inside too much, and condenser external cleanup+radiator/condenser gap sealing with foam, things i've successfully done on my car myself) the AC, then show the compressor working correctly and then the cold and heat the AC system can provide inside at request. You don't know how many cars get sold with the "AC just needs regassing" trick that then turns out to be a serious leak (such as a leaking evaporator), a seized compressor or an inoperational compressor clutch, so keeping AC in top shape and then showing that to the buyer might definitely be added value.

Yes, your "flaky AC" might range from a simple cabin air filter replacement & regas to a seized compressor or evaporator leak, but in my own opinion it's definitely worth looking at.

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