Q: Overheating issue with my 1994 Honda Accord

asked by on November 07, 2016

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.

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

What others are asking

I’ve been told the crankshaft bolt on my 2012 Honda Accord is stuck (trying to change timing belt).

You are correct in that if the crankshaft bolt does break, this may cause some serious engine damage, even beyond the damage related to the timing components as there are other accessories that are driven by the crankshaft pulley as...

I have a leak between engine and transmission.

It is possible you have a leak either at the engine rear main seal or a front seal on the transmission. It may be difficult to tell the difference between used engine oil and used gear oil in this area...

I went to auto zone to do diagnostic on my car because in the middle of traffic my car was overheating auto zone did the test and

The vehicle should not have been driven home with the engine overheating. It's possible that you may have now blown a head gasket and damaged the engine. The fan relay connection, if it is melted, would be due to the...

Check Engine light on, air conditioner not working, and car stalls

If your vehicle is stalling and shaking, and the Check Engine light has come on I would recommend having a knowledgable technician, such one from YourMechanic, scan the vehicle for trouble codes. Check Engine lights and engine performance issues may...

Overheating - 1995 Honda Accord

Hey there. This can be caused by a number of things such as low coolant levels, a faulty thermostat, or a failing coolant fan switch. As you may know the [coolant fan switch] https://www.yourmechanic.com/services/cooling-fan-relay-replacement helps to maintain the proper coolant...

I recently replaced the radiator and thermostat and bled the lines now my car is overheating and I'm trying to find out if it's th

You should be able see the fluid circulating with the cap off. Begin with a cool engine, take the cap off and allow the engine to warm up to normal temperature. When the thermostat opens, you should be able to...

Can I disable Bluetooth on a 2017 Honda Civic Hatchback 2017

Hi there - yes, Bluetooth can be disabled on this vehicle if you happen to purchase a model with that feature. It is part of the infotainment system (integrated radio, navigation, etc.). And yes, you can still buy models of...

how to delete the bluetooth paired devices on the honda ridgeline 2014?

Hello, and thank you for writing in. To delete paired phones from your vehicle, access the phone settings and enter the setup option. From there go to the connection section, and select the delete option. Then select the phone to...

How do I use the automatic lighting control?

The automatic lighting control is a feature that will automatically turn your headlights on when it is dark out. To use the automatic lighting control, locate the light switch, which is located on the turn signal lever (the turn signal...

Related articles

How Often Does an AC System Need to Get Recharged?
Your car’s air conditioning system is a lot like your home’s central heating and air, and even more closely resembles the system that keeps...
How to Replace a Fan Clutch
A fan clutch controls the car engine cooling fan and operates on temperature. It's mounted to the water pump and can cause overheating if it's broken.
What Is the Difference Between Climate Control and Air Conditioning
It’s It’s important to be able to control the temperature inside your car’s cabin. During the summer, you need air conditioning to ensure comfort and safety, and during the winter, you’ll need heat for the same reason. However, different cars...