Yes to keeping the weep holes under the doors and the rocker panels too etc. Ultra important! The same goes for all makes of vehicles. If the holes become plugged for any reason or covered by debris either on the inside or the outside surfaces, water and/or condensation, pollutants, salt, etc WILL collect inside and rusting will result until rust thru occurs. Then it's too late!
Of note is that so many before or after purchase new vehicles undercoater operators do not re-open the weep holes after spraying the undercoating material on and rusting happens from the inside out.
Rusted thru vehicles have very poor resale value no mater the age or fine powertrain condition. It's your money rusting away and lost and so easily preventable! Takes about 10 minutes time at least once a year to be sure they are open.
