Skip the auto shop - Our mechanics make house calls

Q: Overheating issue with my 1994 Honda Accord

asked by on

I had a bad headgasket and put in stop leak...Ended up getting a new headgasket..head was milled and cleaned..car is overheating and i took out spark plugs and checked for moisture..there was none..put n new radiator and new thermostat and car still runs hot.. cooling fans work when the temp gets 3/4 up to hot..any ideas what could be making my car run hot??
My car has an automatic transmission.

Stop leak products will plug up cooling passageways, particularly in the radiator, and consequently OEM manufacturers such as Honda discourage use of these products. In any vehicle, if there is a "leak", of anything (oil, refrigerant, coolant, etc.) the leak has to be repaired using standard, OEM approved professional techniques and stop leak products simply do not qualify as such. In your circumstance, you have a new radiator which hopefully does not have any residue from previously applied stop leak products.

Overheating can be due to lean engine operation. That possibility can be diagnosed by YourMechanic. Trapped air in a cooling system can cause overheating, so you want to rule that out, too. Typically, there are air purge ports that are opened when refilling the cooling system. A defective radiator cap can cause overheating if the cap is unable to withstand normal system operating pressure.

If all these are ruled out, one approach you can try is use an infrared thermometer to determine the actual operating temperatures, particularly at entrance and exit of radiator and with those measurements determine whether the cooling system fan(s) are coming on at the right (factory specified) threshold. If fan operation is delayed, or the fan motor is not running at the required speed, that could be causing or contributing to the problem. There are timers, relays, and sensors involved in the cooling fan(s) systems, not to mention the condition of the fan motor and bearings.

If you want a professional to evaluate the overheating issue, and identify the causes of the problem, feel free to schedule an overheating diagnostic with a certified professional from YourMechanic.

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!
  1. Home
  2. Questions
  3. Overheating issue with my 1994 Honda Accord

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: Trucks starts up but have to give gas to keep running then dies starts up a second time then it will stay running.

It sounds like you may have a dirty or failing idle air control valve. The idle air control valve monitors the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and...

Q: Car will blow cold air but will not blow heat

The heater not working in some cases may be related to the overheating problem you are also having. This may be due to a faulty heater blower motor or potentially a bad heater core. As you may know, the heater...

Q: Gas is coming out from under the hood

You didn't say whether you got the car to run, but if you did, do not drive it. It can be very dangerous in this condition. The fuel pumped up to the engine is under pressure, so when it leaks...

Related articles

What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.