Skip the auto shop - Our mechanics make house calls

Q: "H" temp reading

asked by on

My temp / oil gauge is reading "H" . . I have oil and coolant both in car . . my mechanic needs to fix one of my 6 catalytic converters . . . would this be related? . . . is my car dangerous to drive?

My car has 100000 miles.
My car has an automatic transmission.

A: When it comes to the cooling system, there ...

When it comes to the cooling system, there are other components that can fail which would cause the temperature to rise. Even if your coolant is full, if the thermostat will not let enough pass through, the system will not be able to complete the heat transfer process. In this situation, I recommend you start there. If the thermostat tests to be good, you will want to look to the radiator for any time of damages. The radiator can be cracked, have bent fins, or be clogged just to name a few of the common problems. Secondly, a failed water pump would not circulate the coolant. The cooling of the coolant once it absorbs the engine heat will not take place. As far as driving the car while it is overheating, it is dangerous for the engine. Stalling or breaking down while on a busy road can also be dangerous. Never drive the vehicle when it reaches "Hot". Once your vehicle reaches 280 degrees Fahrenheit the engine damage done can be unrepairable. Have this checked out immediately, or do a visual inspection yourself and see if you can make the repairs.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Car overheating with smell

Based on what you are describing it would seem unlikely that this was a one-off incident. When a car engine overheats, there is definitely an underlying cause and, in your circumstance, that could be something going on with the water...

Q: Car shut off when driving, 2009 Toyota Camry

Has the Check Engine Light illuminated after the stall? A loose battery connection can cause abnormal problems on many vehicles. Have the battery and charging system tested for issues and check your maintenance schedule to make sure services are up...

Q: Gurgling noise and transmission fluid leak 2009 Chevrolet Malibu

Hello - the gurgling noise is most likely a cooling system issue - perhaps overheating that has not yet caused a failure. Check coolant level (engine cold), and the transmission fluid level as well. Look for clear, pinkish (not dark)...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.
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.