Engine jerks going up a steep and temeperature is high.
Engine runs normal in the morning but starts jerking once it heats up. When this happens the temperature fluctuates between 30 and 90 degrees Celcius. When the egine is stopped until its cooled, the problem going away, only to recur once its hot again. I has replaced the petrol filter which was thought to be the cause but the problem persists.
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-No not to worry about it if your car never over head.
-No you can't get any reading if the temperature is at your thermostat's setting or below.
-It connect or (Works) ONLY when the temperature at that area reach above the thermostat setting or up to 200 degree or higher.
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!
What you describe is quite normal. While the engine is running and the coolant is circulating the thermostat maintains the engine within its operating temperature range. When the engine is switched off there is still considerable heat within the engine and the coolant will continue to absorb this heat. With no coolant circulation, the coolant inside the engine will register a temperature rise to the extent your gauge measures. This temperature rise may persist for up to 15 minutes until the natural thermo-syphon of the cooling system starts to dissipate this heat build up and the engine starts to cool down. Because the cooling system is pressurised, the coolant is prevented from boiling off at this temperature above boiling point. Once the engine is restarted the coolant flow is re-established taking this excess heat from the engine and the system temperature returns to normal.
These vehicles, when equipped with the 3.1L engine are very prone to head gasket failure. A local garage should be able to preform a block check to tell wether combustion gasses are entering the coolant. Because you said the coolant pushed out the overflow this is definately where i would start. The normal operation of that vehicle is for the fans to turn on around 106 degrees celcius. If you can, take a temperature reading of the coolant to ensure they are coming on at the right temp. Other possibilities are an inefficient radiator, coolant temp switch/sensor causing inproper fan on temperature,
If this happens only when the engine is cold or cool, I would suspect a coolant temperature senor that has lost its calibration. One way to check would be to have the engine controller scanned when the engine is cool then cold. The coolant temperature should be the same as the intake air temperature. If the readings are not close to one another, change the coolant sensor. The coolant temp sensor controls the fuel mixture when the engine is cold, normal or hot. Good luck, let me know. Regards,
sounds like you may be low on antifreeze. ck and top off as nec. then run vehicle again if was low. if engine is running at normal temp (around 195-200 degrees) and not fluctuating, then a possible restricted heater core is suspect. you can flush these cores out fairly easily at firewall under hood. (do this before replacing core, pressure washer works well). if engine temp is not normal(reads low) or fluctuates, replace thermostat.
If you smell coolant , there is a leak. I'm leaning towards a leak in the heater core if no fluid is visable and you smell it. Pull the blower motor off and look inside to see if it is wet. Have you had any issues with the radiator in the recent past? Maybe tried to correct it with stop-leak and didn't open the heater to full on hot? (maybe clogged the heater core up?)