Niagara Gazette — Here’s a few recent questions from readers:
BART FROM LIMA, OHIO: The air conditioning on my 2003 Lincoln Town Car keeps clicking in and out and it’s not cooling properly. Both the high-pressure line and the refrigerant line are filled, so what is the problem?
TOM: The lines might be filled, but at what line pressure? There is a refrigerant pressure sensor that shuts down compressor operation when the refrigerant pressure gets too low. Get a set of manifold gauges on it to compare pressures to factory specs and proceed from there with the diagnosis. You probably have a leak that is stubborn to find and you can’t see it( it might be the evaporator core in the HVAC case). Use a halogen leak detector and possibly a dye test system to track down the source of the leak. Good luck.
FREDO FROM MIAMI: I own a ‘94 Chevy Caprice Classic that I bought 13 years ago. It runs well but I hear a groaning noise from the fuel tank. I think it is the fuel pump. Is this normal?
Fredo from Miami
TOM: No, this is not normal. A worn out fuel pump makes a groaning noise as you describe. Have it replaced or you will find yourself stranded on the road.
JUAN FROM COSTA MESA, CALIF.: I own a 2006 Chrysler 300 with a V6 engine. When I start the car, the headlights flicker and the instrument panel gauges turn off and on. Also, when I turn the car off, the battery goes dead. What’s wrong?
TOM: Have a charging system analysis done on the car. Sounds like the alternator is not charging or there’s a poor battery ground somewhere in the car. Very often bad ground connections can cause problems like you’re experiencing. Check under the hood for a loose ground strap on the firewall. Finally, load test the battery to see if it’s any good. When batteries internally short these symptoms can occur. Success to you.