If astronauts return to the Moon and visited an Apollo site, could they restart a lunar rover?

No, for several reasons.

Firstly, the rovers have been exposed to radiation from the Sun for nearly 40 years. Any electronics have been thoroughly fried, and would have to be replaced, and they weren't designed for this.

Secondly, metal parts in vacuum are subject to vacuum welding especially if they've been repeatedly heated up like the rovers have, so the wheels will be stuck, and any fastenings will have to be cut open.

And thirdly, you'd have to replace any plastic parts, since they'll be too brittle to be used by this time. We know that the flags they put up are likely only small piles of dust, and I doubt other plastics fare much better.

The rovers were designed to be as light-weight as possible, and to last for a few days on the surface. We may be able to scavenge some spare parts, but that's all

Finally, to reuse the rovers, the astronauts would have to land at a previous landing site. We have the data we need from those sites, and there are thousands of other sites that have higher priority. It would also take considerable time to get a rover working, and the astronauts' time is better spent exploring.

Bring along new batteries for the rover and put them in. Unless micro-meteorites or thermal contraction and expansion has completely compromised a particular system, even if it had, there's no reason why a rover could not be repaired and used again.

The cycling of the temperatures as it sat in the sunlight, and then in the lunar night for two weeks at a time for decades will have disabled all of the functions.

i think the guy above me missed something. the guy who had all those reasons. he missed the most crucial detail... the moon landings never happend. cmon, take it at face value, ur government lies to u all the time.

normally, when i tell ppl this, they tell me tht it dont make no difference. n it dont. cept when citizens who are innocent believe lies lies weapons of mass destruction, moon landing, 9/11 and stuff.

stupid bankers. jews... (i was referring to some site called jesus-is-saviour.com or somthing)

go google moon landing hoax. i dont want to go into it now. like why are half the pictures doctored? how come radio waves travelled from the moon to earth in less than 2 seconds when the president replies n stuff? what happened to the van allen radiation belt? why did the flag stay stiff upright, as if wind was being blown on it (impossible on moon, wind blown would diffuse very fast, not reaching flag), doesnt the moon have gravity too? and the multiple light sources? dont make me continue. use man's best friend. the new dog, google...

In any case, that would be a microscopic saving given the cost of the project over years.

yeah, just like a Pontiac.