A 1988 Lincoln Town Car, traded in as part of the federal government’s “cash for clunkers” program, is crushed Wednesday at Pearl Road Auto Parts in Cleveland. Pressing colleagues to replenish the program, Senate Majority Leader Harry Reid warned lawmakers they might miss their August vacation takeoff plans Friday if they don’t quickly pass the billion measure. The Senate came through on Wednesday with a bill to extend the program.

Washington ? The Senate reached a deal on saving the dwindling “cash for clunkers” program late Wednesday, agreeing to vote on a plan that would add $2 billion to the popular rebate program and give car shoppers until Labor Day to trade in their gas-guzzlers for a new ride.

Following lengthy negotiations, Senate Majority Leader Harry Reid said Democrats and Republicans had agreed to vote on the plan today, along with a series of potential changes to the bill, which was passed by the House last week. Reid has said Democrats have enough votes to approve the measure and reject any changes that would cause an interruption in the rebates of up to $4,500.

Reid said the agreement “accomplishes what we need to accomplish.”

Late Wednesday, it was not clear that any of the proposed amendments stood a chance of passing. Some of them included placing an income limit on those benefiting from the vouchers and requiring the government to sell off its stakes in General Motors Co. and Chrysler Group LLC.

Any Senate changes to the bill would require another vote in the House, something that couldn’t take place until the House returns in September from a monthlong recess.

The government said Wednesday that more than $775 million of the $1 billion fund had been spent, accounting for nearly 185,000 new vehicles sold. President Barack Obama has said the program would go broke by Friday if not replenished by Congress.

Administration officials have estimated the additional $2 billion could fund another 500,000 vehicle sales and last into Labor Day.

That’s the same day the Senate was to follow the House into the August recess, a looming break that Senate leaders often use to prod their colleagues past standoffs.

“We all acknowledge there’s a significant majority that want to move forward with this legislation,” Reid, D-Nev., said earlier in the day, adding that he has the votes to approve the House-passed version as is.

His Republican counterpart, Sen. Mitch McConnell of Kentucky, concurred that the matter would be settled soon. And objectors conceded they do not have the votes to force all of the changes they want, or to block the House version of the bill.

“My guess is, at the end of the day, it will pass,” said Sen. John Thune, R-S.D., who called it an example of “Congress choosing winners and losers among industries.”

The program offers car buyers rebates of between $3,500 and $4,500 for trading in their gas-guzzlers for new, higher-mileage models.

The new funding would triple the cost of $1 billion rebate program and give as many as a half-million more Americans the chance to grab the new car incentives through September.

Car companies have credited the clunkers program with driving up sales in late July. Most consumers are buying smaller, more fuel-efficient vehicles under the program, according to a list of the top-10 selling cars released Wednesday by the National Highway Traffic Safety Administration.

Among manufacturers, General Motors Co. had the largest share, accounting for 18.7 percent of new sales, followed by Toyota Motor Corp. with 17.9 percent. Ford Motor Co. was third with 16 percent of the sales. Detroit automakers represented 45.3 percent of the total sales while Japan’s Toyota, Honda Motor Co. and Nissan Motor Co. accounted for 36.5 percent.

The Toyota Corolla is the top-selling vehicle on the list, followed by the Ford Focus, Honda Civic, Toyota Prius and the Toyota Camry. There is one SUV on the list, the Ford Escape, which also comes in a hybrid model that can get up to 32 miles per gallon. Six of the top-10 selling vehicles are built by foreign manufacturers, but most are built in North America.

If the Senate approves the additional money, it’s likely to lead automakers to increase production and bring back laid-off workers. Many automakers reported low inventories because of increased sales from the program at the end of July. Already Hyundai Motor Co. has added a day of production to its Montgomery, Ala., plant, and Ford is considering increases.