Q: I own a 2007 Ford Explorer with the Sirius Satellite radio. I’m having trouble with the Satellite radio reception. It keeps saying that it doesn’t have a signal. The AM/FM reception is fine. I’ve had it back to the dealer twice and they haven’t been able to solve this problem. Can you please help? -- R. C., Tinley Park

A: R.C., a separate antenna is used for Satellite radio reception. There could be a problem with this antenna or its electrical connection to the radio. It also could be problem with your Explorer’s radio. If the dealer is unable to remedy the situation, call Ford’s Customer Assistance Center at 1-800-392-3673.

Q: I own a 2004 Buick Rendezvous and I accidentally put windshield wiper solvent into the overflow reservoir for the radiator. I took it back to the Buick dealer and they told me I had to have the radiator and overflow reservoir flushed out. What do you think? -- R.W., Tinley Park

A: R.W., if you hadn’t driven or operated the engine in your Rendezvous, only the overflow reservoir would need to be flushed out. But it sounds as though you drove your Rendezvous to the dealer. If that were the case, I’d confer with the dealer and suggest that the cooling system and overflow reservoir be flushed.

Q: My 2001 Chrysler Town & Country has a problem with the dome lights flicking on an off. Also, the door locks are clicking. Do you know what could be wrong? -- R.P., Homer Glen

A: R.P., the likely culprit is with one of your Town & Country’s 'Door Ajar' switches. There’s one inside each door attached to the door latch mechanism. Take your vehicle to the dealer or a shop that employs ASE-certified technicians in electrical repair for a proper diagnosis.

Q: The heater core in my 2002 Chevrolet Impala has started leaking. A friend of mine told me this is a very expensive repair (around $1,000) and usually requires the entire dashboard to be removed. I’m on a tight budget and can’t afford an expensive repair. Could you please tell me about how much the job should cost? -- J.M., Chicago

A: J.M., not all vehicles require dashboard removal to access the heater core. Lucky for you, your Impala has an access cover that allows heater core replacement without disturbing too much. You can expect to pay around $400 for parts and labor to replace your Impala’s heater core.

Q: I’m the second owner of a 2004 Honda Accord (3.0-liter V6) with almost 100,000 miles. I don’t have a maintenance guide and was wondering at what mileage the timing belt should be replaced. Can you help? -- B.R., Niles

A: B.R., Honda recommends it be serviced at 105,000 miles.

AutoAdviser: Ira Siegel is an Automotive Instructor and ASE Certified Master Auto Technician. If you have auto-related questions for Ira Siegel you can call and leave your questions at the Auto Adviser Hotline at 708-633-6839 or e-mail a question to Autoadvisr@aol.com.