Car is overheating and building pressure in top water hose

ANSWER : Coolant leaks can occur because of cracked hoses, leaking gaskets, faulty water pumps, or damaged radiators. When the coolant level goes low, the engine will start to overheat due to the low coolant level. I would first recommend giving the cooling system a visual look over. If it is not obvious where the coolant leak is coming from, I would recommed having the cooling system pressure tested in order to determine the leak source. If you would like to have your cooling system pressure testedcoolant is leaking inspection, consider YourMechanic, as a certified technician can come to your home or office to inspect your cooling system.

ANSWER : Hi, thanks for writing in about the concern with the BMW 320i. If the battery was submerged in water then it’s completely possible for the battery to short out and die. Your friend will need to have the battery replaced. Also be sure to get all of the water out of the trunk. Have a certified technician, like one from YourMechanic, help you guys out if you need assistance with replacing the battery. Good luck.

ANSWER : Other possible causes of overheating include failed head gaskets that allow exhaust gases to leak into the cooling system, a major blockage in a cooling passageway, a failed radiator pressure cap, non functioning radiator cooling fans and poor engine running condition. There are tests that can detect exhaust in the coolant to rule that possibility in or out. If you desire that the root cause of the engine overheating be diagnosed by a certified Mechanic, dispatched by YourMechanic right to your location, please request an engine overheating diagnostic and the responding certified mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

ANSWER : Hi there – you may have 2 related events here, a coolant leak, and a problem with the heater system. The current issue may be air inside the cooling system, which can cause overheating, and a lack of heater function. The lack of heater function could have 5 causes: the engine is not getting up to correct temperature (center of the gauge) due to a malfunctioning thermostat, the heater control valve is not letting hot coolant into the heater core, there is a restriction in the heater system that is preventing adequate hot coolant flow through the heater core, the heater fan is not working to transfer heat from the heater core to warm air for the passenger compartment, or the air blend doors inside the heater are not working properly to route warm air to the desired vents. I would recommend a heater system inspection](https://www.yourmechanic.com/services/heater-is-not-working-inspection) by a mobile, professional mechanic, such as one from YourMechanic, who will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

ANSWER : Hello. If you wanted to diagnose these other parts, then you would need to use an infrared thermometer to see if the coolant hoses are getting hot and that the radiator is getting hot indicating that the coolant is flowing. If not, then you may have an issue.

Most of the time, if the engine overheats and did not get too hot then it is the thermostat. It can also be caused by a bad water pump if the turbine is failing.

If the engine got really hot, then I would do a block test. This would tell me if there is an internal engine issue such as a head gasket. This test should really be done first before changing any other parts.

If you want to have this looked at, consider YourMechanic, as a certified mechanic can come to your home or office to diagnose the overheating issue and replace the water pump or thermostat if necessary.

ANSWER : Hey there, thanks for writing in about your 2004 Buick Rendezvous. When the engine is cold, the thermostat will remain closed and keep coolant circulating through the engine to be warmed up faster. Once the coolant inside reaches operating temperature, the thermostat will open and allow coolant to flow to the radiator. If you are getting no flow at all, even with the engine getting hot, then the water pump may be faulty. If you need help having this looked at, a certified technician can inspect the system and replace your water pump if necessary.

ANSWER : You should replace the timing belt if it got wet with coolant or it will fail prematurely. The timing marks shown here will align only every two revolutions of the crankshaft.

ANSWER : Hello. You do likely have a major boost leak or vacuum leak present. Volkswagen’s are very sensitive to any type of vacuum leak. On Volkswagen’s, even if the oil dipstick is is removed it will produce a vacuum leak cause the engine to idle erratically. I suggest that a smoke test is performed on your vehicle by a shop or technician which well help find the leak(s). A different way to test it is to spray starting fluid around your areas where a vacuum leak might be. The RPM’s increasing when spraying starter fluid would indicate that there is a vacuum leak present nearby the area being sprayed.

Please keep in mind that the technicians here at YourMechanic can perform such diagnostics.

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