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4Runner

The reason the heat was working intermittently is once the coolant starts boiling within the cooling system, the boiling action creates an impediment to normal coolant circulation to and through the heater core. So, ironically, even as the engine is...

There is a way to manually close the sunroof in your vehicle. There should be cover next to the sunroof button, that when removed, has a button for manually closing the sunroof. The details of how to do this can...

Hi. A malfunctioning belt tensioner is likely, as well as other component along the belt drive system, to cause failure with the belt. Have a technician remove the belt and make sure all of the other components spin freely at...

Oxygen sensors don't work in that voltage range. Oxygen sensors range from .1 to .9 volts. When the vehicle is running normal the sensor ranges between .4 to .6 volts. The O2 voltage should change constantly going above and below...

Hello. Unfortunately, there is not really anyway to tell whether or not a genuine head gasket was replaced or sealer used. I would recommend having an expert from YourMechanic come to your home to take a look at the car...

The skipping you are feeling is the engine misfiring. Your engine coils, plugs and plug boots may need replaced. The valve covers may also be leaking oil into the spark plug holes and the cause of the miss fire. I...

Hi there, thanks for writing in. I'd be happy to provide my insight. There is a possibility that they may have overfilled the brake reservoir with brake fluid. Start by checking that it has the proper amount. Secondly, it is...

In order to properly test the system you will need to hook up gauges and check the pressures to see if the low side is getting low enough psi to cycle the compressor. Check if it is getting bellow about...

Anytime you replace the pump you will get air in the fluid and will need to let the engine idle for a few minutes and then let it sit with engine off for 5 minutes and repeat process until all...

Claimed by Kevin Gainer

The transmission may be slipping internally from a bad clutch servo or it has an internal seal leak. Have the transmission tested for proper pressures to see if it is a solenoid issue or the seals are leaking causing it...

Your engines timing belt is recommended to be replaced every 90,000 miles. If you cannot find proof that the timing belt was replaced at 90,000 miles then I would recommend timing belt be replaced. (https://www.yourmechanic.com/services/timing-chain-replacement) This engine is an interference...

If your power steering pump is leaking, that would be the cause of the noise you are hearing. Since a leak exists in the system, the fluid level is likely low. Hydraulic systems depend on an exact amount of fluid...

A knocking sound within the engine is likely caused by low oil. I would first start by checking the oil level to ensure it is full. If the oil is low, you can top it off and see if anything...

First off, spark plugs are not going to affect fuel mileage. Also, how are you checking fuel mileage? If you are using the indicator on your dashboard or overhead console, this isn't perfectly accurate. The only accurate way is to...

Hello! It sounds like you may have a clogged catalytic converter or potentially a faulty Oxygen sensor. The catalytic converter converts toxic exhaust gases into less harmful pollutants that are suitable to be expelled into the atmosphere. When this is...

Quite often, issues with maintaining cold air flow (https://www.yourmechanic.com/article/why-won-t-my-ac-blow-cold-air) with an air conditioner are due to a commonly overlooked issue - charging AC refrigerant. Although most vehicles (like your Toyota 4-Runner) have a closed-loop AC, when a leak occurs and...

Among common possibilities for the loss of power you are describing are throttle body faults (electronic throttle controls, throttle position sensor, mass airflow sensor, torn air intake hose), worn out spark plugs, faulty fuel pump or restricted fuel system, plugged...

You may have blown a head gasket. This would be the loss of compression and even a noise from engine.

Hi Mary. Thanks for contacting us tonight. In most cases, when your heater blows cold air and the engine temperature is hotter than normal, it usually indicates an obstruction of debris inside the heater core. Sometimes, having the coolant system...