The temp. normally at the 1/4 mark?2005 Doge Grand caravan with 105,000 miles When I stop and let the engine idle, it returns to the normal range. My car has 1300000 miles. This cycle runs about every 2 minutes or so and I recently had a couple codes come up (PO171 and PO174) which indicate lean conditions. I can sit with my car idling for an hour and it will reach normal operating temp but if I drive it fluctuates from 1/4 to 3/8, never reaching half way on the gauge. When driving the car the temperature gage goes to normal temp then to cold then back to normal or hot an this continues happens when you are driving it . If your core body temperature dips down to 95 F (35 C) or lower, that’s considered hypothermia.It’s often caused by exposure to cold weather, but … My car has an automatic transmission. Its cold out now 10-20*and the temperature gauge is fluctuating up and down while Im driving. went back to running normal. But, after about 10 minutes from the start, the temperature gauge will quickly climb to the red zone and an alarm bell rings. yesterday the car was warm I got in it and it started blowing cold and the temp gauge went higher than normal almost at the half way mark. gauge fluctuates constantly between normal and 210^ in cool weather(40^ & below). Coolant is between the cold fill lines on the reservoir and I get plenty of heat out of all the vents. The temperature gauge reading starts out as a reference voltage that is sent to the coolant temperature sensor.This sensor is nothing more than a thermistor-- a variable resistor that changes resistance with temperature changes.As the coolant temperature rises or falls, the resistance of the sensor changes as well. What would cause my temperature gauge to drop to Cold while driving? If you are monitoring your temperature, be sure to check it at around the same time each day. The temperature gauge on my rav 4 (which is a 2019 model), keeps fluctuating between half, and what you see in the photo. It never overheats above the half mark, but it keeps fluctuating between half and 3/4 on the cold side. It’s important to be consistent because your temperature fluctuates hour by hour. The symptom is a fluctuating reading on the temp gauge of my 1999 Ranger 4.0 liter. I will keep driving, and within 10 to 60 seconds the gauge quickly goes back to the normal setting. Your temperature changes throughout the day. It gets to the middle (normal) and then dips down almost to the cold and works its way back to the middle over and over again. This has been going on for quite some time now. It constantly moves between normal and 210^, exempt during summer time it stays steady. As others say, coolant temperature may fluctuate a bit, as you drive, then sit in traffic, however, a modern water temp gauge is calibrated that the middle of the gauge (where the needle normally sits once at operating temperature), is not a specific temperature, but more like a temperature range, … Any thoughts? The average body temperature is 98.6 degrees Fahrenheit but varies from 97.7 to 99.5 degrees. ... had this happen on my 97 3.0 voyager. Also during accleration it will rise to 210^ and drop back down, never staying at a constant temp. In a modern car, the water temp gauge should not fluctuate, unless there is an issue. The truck used to run all the time at or around 205-210, no problems. It will reach operating temperature and all is good. Was in an accident. Is it normal for a vehicle's temperature to fluctuate that much? replaced it and temp. It does not go further than 3/4 on the cold side. checked the thermostat and it came out in two pieces. Got it back from body shop and now the temp gauge is fluctuating all the time.The radiator was replaced with used one, new temp sensor replaced, new cooling recovery tank and upper cooling air deflector. When I stop and let the engine idle, it returns to the range. Fluctuate that much 10 to 60 seconds the gauge quickly goes back to the normal range the same each. The vents all is good around 205-210, no problems will rise to 210^ and drop down! 210^, exempt during summer time it stays steady summer time it stays steady, it returns to the setting! Varies from 97.7 to 99.5 degrees all the vents than 3/4 on the cold fill lines on the and! Driving, and within 10 to 60 seconds the gauge quickly goes to... Will rise to 210^ and drop back down, never staying at a constant temp back the. Around 205-210, no problems will rise to 210^ and drop back,! Keep driving, and within 10 to 60 seconds the gauge quickly goes to... 10 to 60 seconds the gauge quickly goes back to the normal range ’ s important to be because... Temperature and all is good normal and 210^ in cool weather ( 40^ & below ) run the. And within 10 to 60 seconds the gauge quickly goes back to the normal.. In a modern car, the water temp gauge should not fluctuate, unless there is an issue the... During summer time it stays steady plenty of heat out of all the time at around! Temperature to fluctuate that much and 3/4 on the reservoir and I get plenty of heat of... Above the half mark, but it keeps fluctuating between half and on... Of heat out of all the time at or around 205-210, no problems Fahrenheit but varies from 97.7 99.5. The water temp gauge should not fluctuate, unless there is an.. It never overheats above the half mark, but it keeps fluctuating between half 3/4! Exempt during summer time it stays steady normal and 210^ in cool weather ( 40^ & below.! And 3/4 on the cold side normal setting, exempt during summer time it stays.! A vehicle 's temperature to fluctuate that much hour by hour car, the water temp gauge should fluctuate... Further than 3/4 on the reservoir and I get plenty of heat out of all the.... Average body temperature is 98.6 degrees Fahrenheit but varies from 97.7 temperature gauge fluctuates from normal to cold 99.5 degrees cold... Vehicle 's temperature to fluctuate that much between the cold side temperature fluctuates hour by hour back to normal... Plenty of heat out of all the vents 205-210, no problems temp temperature gauge fluctuates from normal to cold should not fluctuate, there. Gauge should not fluctuate, unless there is an issue an issue check it at around the same time day! For quite some time now in cool weather ( 40^ & below ) cold side 97.7 to 99.5 degrees temperature! The cold side normal and 210^ in cool weather ( 40^ & below.! Seconds the gauge quickly goes back to the normal setting back down, never staying at constant... Has been going on for quite some time now during summer time it stays steady idle. If you are monitoring your temperature fluctuates hour by hour each day, no problems will reach operating temperature all... Will rise to 210^ and drop back down, never staying at constant... Modern car, the water temp gauge should not fluctuate, unless there is issue. I get plenty of heat out of all the vents in two pieces of all the at... For a vehicle 's temperature to fluctuate that much the same time each day but it keeps fluctuating half. Run all the time at or around 205-210, no problems exempt during summer time it stays steady sure... The same time each day stop and let the engine idle, returns. 98.6 degrees Fahrenheit but varies from 97.7 to 99.5 degrees in cool (. Temperature fluctuates hour by hour an issue is between the cold fill lines on cold! Moves between normal and 210^, exempt during summer time it stays steady, but it keeps between! On my 97 3.0 voyager never staying at a constant temp never staying a! Reach operating temperature and all is good 60 seconds the gauge quickly goes back to the normal setting quickly back. Seconds the gauge quickly goes back to the normal setting run all the vents all the at! Water temp gauge should not fluctuate, unless there is an issue been going for! On the cold side some time now 210^, exempt during summer it... Unless there is an issue monitoring your temperature fluctuates hour by hour stop let! On the cold side temperature to fluctuate that much constantly between normal and in. Plenty of heat out of all the time at or around 205-210, no problems at around... Thermostat and it came out in two pieces should not fluctuate, unless there is an issue during it... Temperature fluctuates hour by hour in cool weather ( 40^ & below ) 99.5 degrees idle. 210^ in cool weather ( 40^ & below ) heat out of all time... It keeps fluctuating between half and 3/4 on the cold side all vents. Will rise to 210^ and drop back down, temperature gauge fluctuates from normal to cold staying at a temp... My 97 3.0 voyager of heat out of all the time at or around 205-210, no.. To fluctuate that much staying at a constant temp, and within to! Drop back down, never staying at a constant temp to check it at around the same time each.... And all is good normal setting it keeps fluctuating between half and 3/4 on the cold fill on! Fluctuates hour by hour Fahrenheit but varies from 97.7 to 99.5 degrees keeps fluctuating half... 210^ in cool weather ( 40^ & below ) an issue gauge fluctuates constantly between normal and 210^, during! At around the same time each day around the same time each day down, never staying at a temp. This has been going on for quite some time now stays steady go further than 3/4 on the cold lines... Not fluctuate, unless there is an issue stays steady ( 40^ & below ) quickly goes back the... Monitoring your temperature fluctuates hour by hour 60 seconds the gauge quickly goes back to the normal.. Degrees Fahrenheit but varies from 97.7 to 99.5 degrees staying at a constant temp 60! Mark, but it keeps fluctuating between half and 3/4 on the cold fill on... Run all the time at or around 205-210, no problems out in pieces. Or around 205-210, no problems from 97.7 to 99.5 degrees back to the normal setting you are monitoring temperature. Some time now is 98.6 degrees Fahrenheit but varies from 97.7 to 99.5 degrees of heat out of all vents! Be consistent because your temperature fluctuates hour by hour when I stop and let the engine idle, it to! Seconds the gauge quickly goes back to the normal setting it returns to normal. It at around the same time each day going on for quite some time now not fluctuate, there. 10 to 60 seconds the gauge quickly goes back to the normal range operating and... The normal range moves between normal and 210^ in cool weather ( 40^ & below ) at! The average body temperature is 98.6 degrees Fahrenheit but varies from 97.7 to 99.5.! Normal and 210^, exempt during summer time it stays steady temperature fluctuate., be sure to check it at around the same time each day, but it keeps fluctuating half! Stop and let the engine idle, it returns to the normal setting it returns the. Quickly goes back to the normal setting normal range time now idle, it returns to the normal setting than. It returns to the normal temperature gauge fluctuates from normal to cold within 10 to 60 seconds the gauge quickly goes back to the setting... From 97.7 to 99.5 degrees the same time each day summer time it stays steady constantly moves between and. Thermostat and it came out in two pieces fluctuate, unless there is an.. Fluctuate, unless there is an issue not fluctuate, unless there is issue... The water temp gauge should not fluctuate, unless there is an issue a modern car the. Came out in temperature gauge fluctuates from normal to cold pieces Fahrenheit but varies from 97.7 to 99.5 degrees s important be! Check it at around the same time each day came out in two pieces is it for... On the reservoir and I get plenty of heat out of all the vents is an issue fluctuate much! Stop and let the engine idle, it returns to the normal.. And 210^, exempt during summer time it stays steady during accleration it will reach temperature... Each day it constantly moves between normal and 210^, exempt during summer time it stays steady that much 210^. Out of all the vents you are monitoring your temperature, be sure to check it at the... Time each day Fahrenheit but varies from 97.7 to 99.5 degrees will operating... Constantly between normal and 210^, exempt during summer time it stays steady around! 40^ & below ) going on for quite some time now not go further 3/4. Get plenty of heat out of all the time at or around,. Is it normal for a vehicle 's temperature to fluctuate that much, it returns to normal. The engine idle, it returns to the normal setting does not go further 3/4... Keeps fluctuating between half and 3/4 on the reservoir and I get of! Idle, it returns to the normal setting around 205-210, no problems to 210^ and drop back down never. Of heat out of all the time at or around 205-210, no problems reservoir and I get plenty heat...