Rick's Free Auto Repair Advice

Blower motor resistor keeps failing

Why does blower motor resistor keep failing? What is a blower motor resistor? Many car makers use a blower motor resistor in conjunction with a multiple speed switch to provide three or four blower motor speeds. The blower motor resistor is really a pack of resistors wired in series. See the image below. To run on the slowest speed, the power runs through all three resistors. For each higher speed, power flows through one less resistor. Some car makers run blower motor power through the fan speed switch first, then … Read More

Extend motor oil change intervals with synthetic oil?

Can you really extend motor oil change intervals with synthetic oil? Self-proclaimed oil experts insist that you can automatically extend motor oil change intervals up to 10,000 miles simply by switching to a full synthetic oil. Do they have any proof to back up their claims? Well, some do. Those are the people who have taken oil samples and sent them to a lab for analysis. But can you extrapolate their results to cover your particular engine? NOPE. Want to know the difference between conventional and synthetic oil? Read this … Read More

Diagnose compressor clutch coil

Test compressor clutch coil If your car’s AC compressor clutch won’t engage and low side and high side pressures are within specifications, test compressor clutch coil. Using a DVOM set to the ohms scale, disconnect the electrical connector to the clutch coil. Touch the probes to the clutch coil terminals. Normal clutch coil resistance is 3Ω to 5Ω. Readings less than 2Ω or greater than 5Ω mean the clutch coil is bad. Check operational voltage With the engine running and AC in MAX position, set your DVOM to DC volts … Read More

Brake light on after brake job

Why is the brake light on after brake job? You did your own brake job and now you’ve got a brake light on after brake job. Ok, here’s what you did wrong: The last step in any disc brake job is to return the caliper pistons to a position where they’re contacting the brake pad backing plate. To do that, you compress the brake pedal 2-3 times with the ENGINE OFF until you get a firm pedal. Skip that part and you’ll have lousy braking and a brake light on. … Read More

Jeep AC blows warm

How to diagnose and fix Jeep AC blows warm condition Jeep service bulletin may fix your Jeep AC blows warm problem Chrysler has issued a service bulletin 24-006-10 to address a Jeep AC blows warm condition on 2011 Jeep Grand Cherokee vehicles. This bulletin applies to 2011 Jeep Grand Cherokee vehicles. The A/C system may be inoperative or may lose charge. This may be caused by a weld issue inside the service port on the liquid side. This condition is difficult to diagnose since the A/C gauge set (when connected) … Read More

Heater core failure

What are the symptoms of heater core failure? A heater core is a small radiator heat exchanger that sits under your dash and heats cabin air. If you neglect proper cooling system maintenance you can experience heater core failure. A heater core can fail in several ways: • The tiny passages become plugged with corrosive materials that prevent the flow of coolant and the transfer of heat • The tubes corrode and leak coolant into the heater box assembly under your dash. When that happens you’ll can see an oily … Read More

B0084 service airbag message

Fix B0084 service airbag message What is a B0084 trouble code? The two basic codes are: B0084 Front End Sensor 1 B0085 Front End Sensor 2 But you may have additional digits after the basic trouble code. Here’s what those additional numbers mean: B0084 39 Electronic Front End Sensor 2 Internal Electronic Failure (Right) B0084 3A Electronic Front End Sensor 2 Incorrect Component Installed (Right) B0084 71 Electronic Front End Sensor 2 Invalid Serial Data Received (Right) B0085 00 LF Side Impact Sensor No Additional Information B0085 0F LF Side … Read More

Car AC is charged, not cold

Car AC is charged, not cold If your car AC is charged but not cold, here are the items to check Did you add refrigerant from a DIY kit? If your AC is charged but not cold, read this. Over time, most car AC systems develop leaks and lose a small amount of refrigerant. This happens most often in the winter when the seals and tubes contract. Then, when summer arrives and the tubes and seals expand, it’s hard to find the leak. Most DIYers think they can just top … Read More

Abnormal AC manifold gauge readings

What does abnormal AC manifold gauge readings mean? How to diagnose car AC with manifold gauges Low side low/high side low: system low on charge Low side reads 15-30-psi and high side reads 110-150 Low cooling Low side is low. High side normal to slightly low Causes: Low on refrigerant charge Restriction in the low side of the system causing evaporator starvation. Restricted or plugged orifice tube Problem with expansion valve Moisture in the system. Moisture collects and freezes on the expansion valve or orifice tube, cutting off flow of … Read More

Diagnose car AC with gauges

How to diagnose your car AC with gauges Using a manifold gauge set to diagnose car AC issues You’ll need manifold gauge set if you want to properly diagnose your car AC with gauges. You can’t really diagnose with just a low pressure gauge. You’ll also need temperature probes and a multimeter that accepts K-style fittings. For more information about conducting tests using temperature probes, see this post. However, in this post I’ll concentrate on understanding pressure readings to diagnose car AC issues. You can’t really diagnose charge level in … Read More

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