Skip the auto shop - Our mechanics make house calls

Q: Overheat but gauge is not on H

asked by on

December 2014, my car started overheating. We( bf and I ) and helped from Kim Auto and Tap's Auto repair put in new timing belt, new radiator, new water pump ( 2 didn't work ), new spark plugs by me, new battery by me, new coolant fan switch, oil drain plug, fix power steering pump, alternator, air filter, that plastic mold for air filter, dist rotor, fuses by me, radiator cap, coolant temperature sensor gauge by me, and replaced the port vacuum switch and this is the last part I added. I turn on the car. No overheat. I thought I solved the problem. 2 hours later, I had to go to work. As I was driving the car, the gauge slowly moved up not to H but to the line just before H. I feel like I am losing my mind. They checked the engine cap to see if there is any white smoke for head gasket. Nope. What else should I look for? Please and Thank you.

My car has 277785 miles.
My car has an automatic transmission.

A: You did not mention the thermostat being re...

You did not mention the thermostat being replaced. If you did not replace it, then it may be sticking or not opening. The next thing to check is to see if the fans are coming on before the temperature gets too hot. Sometimes the fan motor has a dead spot and will not come on without moving it by hand or driving above about 45 mph. I recommend checking the temperature at the thermostat housing to see if the thermostat is opening as it should. Check the upper and lower radiator hoses when the engine starts getting hot to see if the upper and lower hoses are both hot, but the lower hose may be a little cooler due to the radiator cooling it down. If the radiator is defective, it may not be cooling the engine enough due to clogged passages.

Have a mechanic, like one from YourMechanic, check for proper flow of the radiator, thermostat, and then see if engine has a bad head gasket. They will be able to come to your home or office to properly diagnose your car’s overheating issue so that you can quickly have this problem resolved.

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

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: I belive its my alternator put 3brand new batteries in the car and still want start

Hey thanks for writing in about your 1990 Lexus LS400. A no crank condition such as this will not be the alternator. You either have a bad starter or a bad connection. The most effective tool to diagnose this condition...

Q: Car won't go into reverse.

The manual transmission on these vehicles had a bad reverse gear design and was very prone to failure after getting worn. The transmission reverse gears do not engage enough in these transmissions and after the gear wears will not engage...

Q: Replaced brake light switch but still no lights when pressing on brakes

Hi there. Check the fuses/relays and replace as necessary. If the fuse is blown and blows again we'll need to investigate what is causing the circuit to overload. If the fuse checks ok, then check for supply voltage at the...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...