headlights on my 1989 convertible “stick” when I open or close them

Q. The headlights on my 1989 convertible “stick” when I open or close them. Is there a point where they should be lubricated? I checked the obvious wiring connections to make sure that they are not loose. Could the “sticking” be the result of a bad relay? How can I tell if the motors are bad? I appreciate all help/advise that I can get. Read More

69 427 tri-power extremely weak ignition circuit

Q. I have a 69 427 tri-power. I just changed the accelerator cable and then had an extremely weak ignition circuit. I installed a new battery…was due anyway and still weak. I have juice to the alternator, horn relay, starter, and terminal relay on the firewall checked with a test light. Is there a ground wire attached to the gas pedal bracket/linkage I did not connect. Thanks for the help.

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65 327/350 A/C Convertible terrible shudder when the clutch is let out

Q. I have a 65 327/350 A/C Convertible that I’ve had and babied for 25 years. A stunning show car. I finally had the engine out for a rebuild last year and had the transmission rebuilt too with a new clutch. I’ve been through 3 clutches in less than 200 miles. Each one with the same problem. A terrible shudder when the clutch is let out. When I have to slip the clutch to get up the incline of my driveway and slowly go into my garage, it vibrates like it’s going to shake itself apart. After the third clutch was put in, the transmission guy told me it just needs to break in. This does not seem normal. I did not have that problem previously. The brand of clutch that was installed was Luk. I was told that the flywheel was machined. And an engine mount replaced. Anyone have any ideas?

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2002 Z06 had to do a rolling jump start

Q. I have a 2002 Z06 had to do a rolling jump start. Right after got warning lights for check traction control, check stability control (which I don’t have) and check ABS. What is the problem here? Read More

2005 C6 the mirrors do not return to the original position

Q. When I drive my 2005 C6 and put it in reverse, the side mirrors go down for backing. When I put it back in gear to move forward, the mirrors do not return to the original position. Any ideas? Can I fix myself? Thanks Jack Read More

1989 Corvette with a heater problem

Q. I own a 1989 Corvette with a heater problem that I can’t figure out. I changed the thermostat, and ran the car till it got hot. I then checked the heater hoses and the radiator hoses and they are both hot. I did get heat a couple of times and am thinking that a heater door is not opening. Is there a vacuum that operates this door and is there more than one ie; one under the hood and one under the dash? Is there anything else that can be causing this problem besides a plugged heater core which I do not think it is as all the hoses are hot? Thanks, Roger

A. Roger: That depends on which style of HVAC it has. If it is auto temp then it uses vacuum to control the motors that open and close the blend doors. But if it is manual AC then it uses basic cables.

But that presumes the coolant is hot enough and that it is flowing through the hoses and heater core with enough force. You say the hoses are hot but how hot is hot? We would use an infrared thermometer to measure actual temperature and be looking for a minimum of about 160 degrees on the hot hose (you will not be able to touch a hose that hot) and about 15% to 20% less on the return hose. The return hose is cooler because it drops heat into the air circulating through the heater core.

Another item that can upset some of the automatic HVAC systems is the outside temperature sensor. If the outside temperature reading is wrong you may not have heat or you may not have AC. In your case I wouldn’t be surprised if you find a clogged heater core that needs to be flushed.

Originally posted on National Corvette Owner’s Association newsletter http://www.nationalcorvetteowners.com/