Engine overheats with new radiator, new thermostat and fan relay

ANSWER : Check the wiring to the coolant temperature sensor and see if there is power to the sensor switch. If there is no power, then check the cooling fan relay and see if its clicking on. If there is no clicking motion, then remove the relay and check for power to the relay. If there is power to the relay, then the cooling fan relay needs replaced. If there is no power to the relay, then check the fuse. If the fuse is burned, replace the fuse. If the fuse is good, then check power from the fuse to the main circuit on the fuse box. If there is no power, then the fuse box needs replaced. If the fan comes on with the air conditioning system switch turned on, that is because the switch overrides the cooling switch to make the condenser cool down to make the air conditioning system work properly.

If you need further assistance with your cooling fans not coming on when the engine gets hot, then seek out a professional, such as one from Your Mechanic, to help you.

ANSWER : Hi there:

Before you decide to purchase a new radiator and have a new radiator installed on your 2005 Nissan Murano, I’d recommend having a professional mechanic complete a car is leaking coolant inspection first. This will allow them to determine why your radiator is spilling coolant, and also what’s causing your check engine light to occur. It could be a faulty coolant line or other cooling system component is damaged. It might even be caused by an air bubble.

ANSWER : A broken wire can generally fixed, but if the break is too close to the connector, you may want to replace the connector itself. If there is any corrosion inside the connector, then definitely replace the entire connector and the component it connects to for the best result. Consider having an experienced technician, such as one from YourMechanic, come out and take a closer look to offer a more personal diagnosis on the radiator fan.

ANSWER : Hi there. It’s likely that the radiator is the actual problem. Over time, the interior of older radiators will corrode and cause rust and other materials to break off and cause obstructions inside the coolant system. This can impede the water pumps ability to efficiently flow coolant through the system. It’s also possible that your heater core is clogged up with debris, causing this issue. Here is a quick test to confirm this. Start your Jeep and turn the heater on full blast. Wait about five minutes, if you don’t feel heat coming from the heater vents, your issue is with the heater core. If you need help diagnosing your problem, please feel free to set up an engine is overheating inspection.

ANSWER : Hi there, it sounds like you’re on the right path; it’s overheating because the fans aren’t turning on. We know your thermostat and water pump are both operating, otherwise it would most likely be overheating all the time. You said you replaced the relays, but what about the fuse? The power supply to the relays will be fused, and if that fuse is blown the fans will never turn on.

Check for power on both sides of the fuse with the key on. If the fuse is ok and you have power, check for power at the relay box. If you have power there and jumped the circuit with a wire before, and the fans still didn’t come on, then there is an open circuit somewhere, you just need to find it. If there is power at the relay and the fans work when you jump the relay, then you might have a failed engine coolant temperature sensor, which is what powers up the relay when the engine gets to a certain temperature. There could be another issue, though it’s hard to say without being able to see the car. To get a thorough, accurate diagnosis, I recommend contacting a professional to diagnose why your vehicle is overheating.

ANSWER : Hello there, many different faults will cause the fans on your 1995 Chevrolet Camaro to not turn on. You have replaced many of the common failure points, but there are a few other potential causes. The most likely is the fans themselves, a wiring harness fault, coolant temperature sensor, or a ECM.

With so many parts replace your cooling fans need diagnosed before any more repairs are made. A qualified technician, such as one from YourMechanic, will be able to diagnose the cooling fan fault and make any repairs required.

ANSWER : Well, you have a couple of questions here and not a lot to go on, so I’ll address them as best I can. Your Check Engine light indicates that a trouble code from a sensor has been registered in the engine’s computer. You’ll need to have a certified technician, like one from YourMechanic, connect a scanner/code reader to the car’s diagnostic connector to inspect what trouble codes have been stored. Trouble codes are a starting point for any technician; in most cases, simply replacing the sensor that sent the code will not remedy the problem and it’s necessary to "look past" the code to get to the root cause.

If your oil pressure lamp is coming on after washing the engine but you haven’t previously noticed problems like knocking or valve noise, or haven’t seen the oil lamp come on before, there’s a good chance that the engine wash caused a short in your oil pressure sending unit or its associated wiring or connectors.

As for whether the Jeep is worth more investment, Kelly Blue Book puts the resale value of an ’04 Jeep Liberty at about $3,500. You’ve replaced a lot of parts, including a new transmission, so if the vehicle is reliable and solid right now it may be worth holding onto it for awhile longer. If you have to keep replacing parts at this point, though, you may be reaching the point of diminishing returns.

If you need assistance with this, consider YourMechanic as one of our mobile technicians can diagnose your car’s Check Engine and Oil Pressure Light firsthand to avoid any unnecessary repairs. Best of luck to you!

ANSWER : Hi There,
Depending on how severe the engine overheating before was, this may have resulted in a blown head gasket or a head gasket that may have partially caused a cylinder leak. When this happens, this can cause the compression in any given cylinder to drop as a result of the cylinder head gasket being damaged. As the gasket leaks and cylinder pressure (or compression) drops, this will result in a loss of power. A blown head gasket may cause a number of different symptoms. A head gasket that fails between cylinders will generally cause a misfire and potentially compression leaks from one cylinder into another. Low compression will eventually result in a rough idling engine. When the head gasket fails between a cylinder and the coolant port, coolant may leak into the cylinder causing it to be burnt with the fuel charge in the combustion chamber. This often results in misfires on startup, especially after the engine is run, turned off and restarted. I would suggest having a professional from YourMechanic come to your location to diagnose and inspect your vehicle to determine what the proper diagnosis may be.