The Jeep is in Puerto Rico, and never stops running.
If you mean the truck in Loch Ness, click the left side, then click and hold the valve stem. Letting air out of the tires will lower the trailer so it can fit under the bridge.
you ask the man for permission and then you click on the jeep
You have to go back to where you started - the farm, which is the bottom right star. Then you go left and you will find your helicopter.
The farmer at Puerto Rico lets you use it when you arrive there.
There are several. The main one is the farmer that lends you his jeep.
say you need to borrow it.
Talk to the farmer who rescues the balloonist at Puerto Rico. He lets you use the jeep whenever you are there.
It is still there, at the owner's house, if you leave. You may have to fly the helicopter to the Mews house and back to regain the jeep.
Get out of the jeep and join the farmer, who has already set up the trap.
Once you herd the 3 spotted goats into the area at Snaggletooth Rock, get out of the jeep and join the farmer who has prepared a trap.
Cut the lock at New Jersey with the bolt cutters from Puerto Rico (they are at the upper left star on the jeep map).
There is no wrench on Cryptids Island. At Loch Ness, click on the left tire, then click and hold the valve stem to let the air out of the trailer tires. At New Jersey, you can cut the lock from the dumpster with bolt cutters from Puerto Rico (upper left star on the jeep map).
Go to Porto Rico. Talk to the man with the moustache by the jeep. Ask him where you can find the chupacabra. Then say your not scared. he will let you borrow his jeep. Go to the city north of the city you started at. Deliver the seeds. Walk left until you see a red tuff of fur on a fence. Click it. Go to Mews.