Q: needle on temp gage keeps raising

asked by on

Just recently had my radiator replaced but the temp gage will go up to h and then drop back down to the half way point on the temp gage. There are no antifreeze leaks, and engine coolant light does not come on. However, there is a smell of antifreeze when the AC or heater when turned on.

My car has 191000 miles.
My car has an automatic transmission.

If you detect the odor of engine coolant, there is likely to be a leak. The leak could be really tiny, as the sense of smell is very good in most people. The heater core, in the dash, can leak (thus potentially accounting for the odor you detect in the car) but if the leak is under the hood, the odor can also travel into the passenger compartment. If the heater core (or any cooling system component for that matter) is leaking, don’t wait to fix that because if the small leak suddenly enlarges, you’ll have a huge mess in the interior of the vehicle, plus you could be stranded due to loss of coolant and subsequent overheating. As far as the engine overheating, a gauge malfunction should be ruled out first, that is you have to distinguish between "real" overheating versus just a faulty gauge indication. If the overheating is confirmed to be real, common causes of overheating, apart from a plugged or leaking radiator which you already dealt with, include low coolant level (including that due to leaks), a faulty thermostat, a faulty radiator pressure cap, collapsed hoses, non functioning cooling fans, and a faulty water pump or drive belt. Certain engine faults, such as a leaking head gasket, poor engine running condition or exhaust blockages can also cause overheating. An important thing to keep in mind is once an engine has overheated, you should replace your engine cooling thermostat because episodes of overheating can damage the thermostat. If the thermostat is damaged, and left in place, that can set the stage for future overheating. If you desire that this overheating problem, as well as the potential coolant leak, 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 all of 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.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. needle on temp gage keeps raising

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Why would my brake light bulb not come out of a 2008 Toyota Sienna? It's stuck..

If you are having problems with the light socket not coming out of the light housing then you must have a melted connector and it has basically welted itself in to the husing. If you cannot get out the socket...

Q: I have a p3449 code which reads mds solenoid 7. Can I just replace the solenoid? Also, tank will not shut pump off after fillup

Hello, thank you for writing in. The code may set the check engine light for several reasons. One of which is low oil pressure. This should be one of the first things that you check. The solenoid you are referring...

Q: Q: Car problem

Your car has a small purge valve that controls the venting of fumes from the fuel tank as these fumes build up inside, particularly when you are refueling the car with gas. The EVAP system prevents fuel vapors from the...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.