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Re: 2003 CR-V; Hot temperature gauge
When the engine overheats it could be for several reasons but most likely a problem with the cooling system, it's never a good idea to drive a vehicle that is over heating, you could start by checking the drive belt to make sure it's not wore or lose, here's a list of other things it could be.
bad water pump
coolant level is low
faulty temperature sensor
cap on coolant reservoir not maintaining proper pressure.
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Check the coolant level! You may be so low that it isn't able to circulate between the engine block and radiator. Add water / coolant mixture to the radiator when the engine is *cold* and then start the engine. Continue topping off the radiator as the engine reaches normal operating temperature. Finally, add water / coolant to the warm / hot level indicator on the coolant reservoir.
The A/C causes the engine to work harder (that's why fuel economy suffers when it is run).
If your car has an electric fan - make sure it runs when the engine is hot. If it does not - you may have trouble w/o the A/C running if is gets warmer outside. Look for fail fuses, disconnected plugs, etc.
You may also have flaky thermostat that is not opening fully when needed to exchange hot water in the engine block with cooler water in the radiator.
First, check the coolant level. You should find a semi-transparent reservoir / tank located under the hood that has a cap marked "Coolant". The side of the tank should have two indicator lines - one for HOT and one for COLD. If the engine has been run up to normal temperature (so that it can provide heat in the car), you should see the coolant level at or slightly above the HOT line. If the engine is cold - first thing in the morning or after sitting for several hours - the coolant should be at or slightly above the COLD line. View these levels while the engine is off and the car is parked on a flat, level surface. If there is not enough coolant - you will need to add the CORRECT type for your car.
(1) With the engine hot, add enough coolant to the tank to bring the level to the HOT line. You may have to check the tank several times after driving if the coolant level in the radiator is down a great deal. NEVER open the radiator cap when the engine is warm or hot!
(2) With the engine cold, add enough coolant to the tank to bring the level to reach COLD line. Additionally - with the engine cold - you can add coolant directly to the radiator by removing the cap. Start the engine, set heat in car to HOT and add coolant mixture to radiator until level comes up to the bottom of the filler neck. Once the engine is HOT (getting heat in the car) check and top off radiator as needed and put cap back on radiator.
Check the levels in the TANK several times over the next few days when cold. If the tank ever empties -you'll need to have this looked at by a mechanic.
Sounds like vapor lock. This is when the fuel turns into a vapor before reaching the engine (it needs to be in a liquid form). This is usually due to high temperature from the engine and environment. I would have someone check it out.
The thermostat "seals" the cool coolant giving up (rejecting) heat in the radiator & heater core from the hot coolant absorbing heat in the running engine "block".
When the coolant in the engine reaches a specific temperature (180 ~ 195 degrees) as determined by the value selected by manufacturer or when replaced, it opens and allows the hot coolant in the engine block to be pumped out to the radiatot & heater core for cooling and the cool coolant in the radiator / heater core is pumped into the engine block - replacing the hot coolant. The thermostat senses cool coolant in the engine block and seals shut until the temperature of the coolant in the engine block rises to 180 ~ 195 degrees again. This process continues over and over for as long as needed.
You should check to make sure that the coolant level in the reservoir / radiator is sufficient by checking when cold. Do NOT remove a radiator cap when it is hot! With the cap off, start the engine and add additional coolant as the engine warms up to normal operating temperature. If coolant levels are ok, the trouble could be related to the thermostat or possibly a faulty temperature sending switch. This means that the temperature of the coolant is fine - but the switch or sensor that converts the temperature to a voltage for the gauge on yur dashboard is the problem.
If the temperature is fluctuating up and down, you should have it fixed. Good luck!
Sounds to me like you've got to open your heater control to full hot and allow the coolant to circulate. You may have some trapped air in the system. In the past, I've even "bounced" the car a little to help speed the process. Check coolant level before and after. Let me know how this works out.
It could be a plugged heater core or heater control problem. I assume the blower is working, but the air is cold. The first thing to check is the coolant level, make sure there is coolant in the resivoir. Next see if the temerature gauge reaches the normal operating temperature range. If the gauge reads cold most of the time, it would tell you that the thermsotat is faulty and not allowing the engine to reach full operating temperature. If your car doesn't have a temp gauge, the blue cold engine light might stay on for an extended period of time. The thermostat is supposed to not allow coolant flow in the radiator until the engine reaches operating temperature. If you drive the car for a couple of minutes, from cold start, the radiator or upper hose should be cool until the engine reaches operating temp.
If the gauge shows hot within the first 30 seconds of starting your car in the morning, you probably have an electrical short in your temperature sensor. This may be located on the engine block or on the radiator. If you can locate it, you might try to disconnect the electrical connector to it and see if the gauge stops indicating hot. If so, you might just buy and install a new temperature gauge sensor (you will need to drain the antifreeze from the radiator (and later replace/reuse it) using the finger-turned draincock at the bottom of the radiator, and should only do this when the engine is actually cold - check the temperature of the radiator cap and squeeze the radiator hoses to see that they are not pressurized, then if cold, remove the radiator cap, place a container below the drain and open the drain). Use teflon tape to wrap the threads of the sensor (in the opposite direction you would screw it in) before installing. Be aware that radiator fluid is toxic if injested by pets or people.
Hi Code P 0217 does point to the thermostat but it also points to the wiring, cooling system, and the temperature sensor, to check the thermostat start engine then once the temperature gauge in the car reaches normal the thermostat should open and the top hose that goes into the radiator will warm up quickly as the thermostat opens, if the thermostat is stuck in it's open position the top hose will start warming up before the engine reaches it's working temperature, hopefully i have explained it clearly,