Yearly Archives: 2020

Radiator Fans

CHICO residents who are old enough have probably heard the term “fan belt”. Back in the day the radiator fan in your vehicle was turned by a belt driven by the engine. There are still belt driven fans, although most are now driven by the serpentine belt. But most CHICO vehicles now have electric fans that draw fresh air across the radiator to cool it. As coolant/antifreeze circulates in the cooling system it captures heat from the engine and flows into the radiator. Air cools the radiator and the coolant in it before it sends it back into the engine to pick up some more heat. Now your engine has an ideal temperature range in which it is most efficient: it shouldn't be too hot or too cool. The electric radiator fans help maintain the ideal temperature. A switch mounted in a cooling system passage checks the temperature of the coolant. If the coolant is at the low end of the range, the switch turns off the fan motor. When the coolant rises to a certain temperature ... read more



Simple Answers from D AND E AUTO REPAIR for CHICO: Water Pump

Question: My water pump went out and it costs much more to replace than ones I've had replaced in the past. My CHICO technician said it's because of where it's located. Why is that? D AND E AUTO REPAIR Answer: Some water pumps are driven by the serpentine belt and are bolted on out in the open with the alternator and air compressor and such.  Other water pumps are driven by the timing belt.  These water pumps take a lot of labor to access and replace.  I suspect your current vehicle has a water pump that is driven by the timing belt. Water pumps are fairly simple devices that circulate engine coolant/antifreeze around the engine and out to the radiator.  Like any mechanical device, they eventually wear out.  Although having a cooling system service done on schedule at D AND E AUTO REPAIR will extend the life of your water pump and its seals and gaskets, it will eventually fail and need to be replaced. Those wate ... read more

Diesel Exhaust Fluid

Diesel engines are appearing in more and more vehicles in nearly every category from compact cars to pick-up trucks to high-performance luxury vehicles.  In much of the world, 40% or more of passenger vehicles are equipped with diesels.  North American is beginning to appreciate the power and fuel economy benefits of diesel engines. Many maintenance items for diesel engines are similar to gasoline engines.  One notable difference is the requirement of Diesel Exhaust Fluid, or DEF.  Modern clean-diesel engines burn very lean to reduce soot and other pollutants.  A side effect is the production of nitrogen oxides which are harmful to the environment.  DEF is added to the exhaust and reacts with nitrogen oxide to produce harmless water and nitrogen. Diesel vehicles have a tank to hold the DEF.  A small amount of DEF is metered into the exhaust as the engine runs. When the DEF starts to run low, the DEF tank must be refilled. Because DEF is so importan ... read more

CHICO: Have You Considered Synthetic Oil?

I recently saw an ad for synthetic oil.  I really hadn’t heard about it before, so I asked by service advisor for some background.  Basically, the inside of your engine gets hot because of friction from the moving parts and from burning fuel.  Oil lubricates the moving parts to keep them from getting too hot.  The problem comes when oil turns to sludge, which is kind of a thick jelly.  Sludge clogs up little passages so that the oil can’t protect parts of the engine.  So, the two best ways to prevent sludge build-up is to always change your oil on schedule; and to use synthetic oil. Synthetic oil’s much more resistant to becoming sludge than conventional oil.  My technician says it has the added benefit of lasting longer than conventional oil, so the recommended change interval Can be longer. The thing I think is cool is that synthetic oil is slipperier than conventional oil.  Regular oil molecules are long chains where synth ... read more

Service Intervals 2

Question: I'm really confused about auto service intervals for various items on my car. Help! D AND E AUTO REPAIR Answer: The simple answer for CHICO residents is to follow the vehicle's recommended service intervals listed in your owner's manual or in your service center's database. But the team at D AND E AUTO REPAIR in CHICO sympathizes with CHICO residents because of the confusing intervals for modern vehicles. The days of simple rules of thumb that applied to most vehicles are long gone. For example, let's look at an oil change: manufacturers' recommendations run anywhere from every 3,000 miles (5,000 kilometers) to 15,000 miles (24,000 kilometers). This big range comes from engine design and recommended types of oil - so CHICO residents really do need to read and follow the recommendations for their specific vehicle. Your owner's ... read more



Simple Answers from D AND E AUTO REPAIR for CHICO: Exhaust Service

Question:My car failed its emissions test – what do I need to do? D AND E AUTO REPAIR Answer: Let's get this out of the way: a leak in your exhaust system could be deadly. If CHICO drivers smell exhaust in the passenger cabin or hear an unusual exhaust sound, they should get their exhaust system checked and repaired. Talk to your friendly and knowledgeable service advisor at D AND E AUTO REPAIR. Carbon monoxide in your exhaust is odorless, colorless and tasteless can be fatal to you and your passengers, so don't delay if you suspect an exhaust leak. There could be a number of reasons for a failed CA emissions test so some diagnostic work is in order. A common reason is that the catalytic converter has failed. The catalytic converter removes some of the harmful elements in exhaust. When a catalytic converter fails it must be replaced, which isn ... read more

D AND E AUTO REPAIR Fuel Saving Tip: Myths

With high fuel prices comes lots of gas saving advice.  Some of it, like what you hear on AutoNetTV, is great.  Some is myth.  And some is just designed to prey on people desperate to save some money on gas. When you get one of those e-mails that’s going around telling you how to save gas, try to think it through.  Does it really make sense?  Does it defy the laws of physics?  Do some research on the internet or ask your service advisor. There aren’t any magic pills you can drop in your gas tank and the government hasn’t suppressed a device you can clamp on your fuel line to make your car run on air. So next time you get one of those e-mails, check it out with an automotive professional.  You’ll get more bang for your buck with an oil change or an engine air filter replacement. Give us a call D AND E AUTO REPAIR 3328 D ESPLANADE CHICO, CA 95973 (530)




Steering is one of the things we take for granted in our vehicles.  Let’s break it down into two areas: first, the power assist and second the actual parts that steer the vehicle. Most people under 40 have never driven a car or truck without power steering.  Most vehicles today have a hydraulic power steering pump that provides boost to help you steer.  The pump is usually driven by the serpentine belt, but some newer vehicles have an electric pump.  Some vehicles even have an electric motor that directly powers the steering. The important thing to keep in mind is that these pumps and motors will eventually wear out and the hoses will start to leak.  You can postpone that day by having a power steering service from time to time.  We will drain the old fluid and replace it with fresh fluid.  This removes water and contaminants that can corrode power steering parts.  Ask your service advisor for the recommended change interval. What about ... read more



The 20.9 Percent Factor (Oxygen Sensor)

Do you know what gas makes up 20.9% of the air we breathe? It's oxygen.   Oxygen is an important part of the combustion process that enables your engine to make power.  The amount of oxygen in the exhaust provides clues as to how well your engine is running.  Your vehicle has oxygen sensors that provide the engine computer with the information it needs to adjust the combustion process. Many vehicles have more than one oxygen sensor.  They are positioned in the exhaust system, one between the engine and the catalytic converter, and another after the catalytic converter.  An onboard computer compares the oxygen levels before and after the catalytic converter to determine if the converter is working properly. An oxygen sensor may fail for many reasons.  You could have bad fuel that contaminated it.  Your sensor may have simply worn out.  Your engine may be burning oil, and that soot can ruin the sensor.  Road contaminants, like salt ... read more

Supplemental Restraint System – Airbags

After they’ve had an accident, some people wonder why their airbags didn't go off. Movies and television lead us to believe that airbags go off with the slightest bump. The reality is much more complicated. First, airbags come out with great force and speed. Now getting hit in the face with an airbag is way better than getting hit in the face with a windshield – but if the accident impact isn't hard enough that you would be severely injured, the airbags may not be triggered at all because they could do more harm than good. So how does your vehicle know when an accident is likely to result in life threatening injuries that would merit deploying the airbags? Well, there are sensors all around your vehicle that send information to the Supplemental Restraint System (SRS) computer that decides which airbags should be deployed and when. There are impact sensors that measure the direction and intensity of an impact in the front, rear and sides of the vehicle. There are se ... read more