Low coolant temperature, thermostat issue thermostats 200...

Q: Low coolant temperature, thermostat issue

asked by on September 19, 2016

The dash in my car was showing the check engine light illuminated. After having done the codes read, this indicated the problem with a low coolant temperature. I was also told that the thermostat might be stuck open. So, I had the thermostat replaced with a new one. I had the hoses and bolts reconnected. After adding coolant, I ran the engine. I made sure there was no air in the system. After the engine ran for about half an hour, I checked the heater. To my surprise, there was no warmth whatsoever. The thermostat seemed to be defective. The car gotten somewhat heated with the last thermostat. What could be the problem now?

Hey there. If a new thermostat has been installed, I believe one of two things could be your issue. Either the thermostat you purchased is somehow faulty even as a brand new part or the cooling fan on your vehicle may be running at all times not allowing the engine to reach operating temperature. I would recommend taking the thermostat back and trying the repair again if your cooling fan is not running all the time. If the cooling fan is running all the time, you may have a short of some kind that is causing this to happen. In this case, the electrical system of your vehicle would need to be thoroughly inspected to determine where the source of the short is located. Due to the fact that thermostats are relatively inexpensive, the quality control on such a part is likely not very good. Therefore, a brand new thermostat may not be brand new quality. As long as the thermostat is not too difficult to access, I would recommend trying the thermostat replacement again. If you would like to have another mechanic take a look at this situation, a certified technician from YourMechanic can come to your home or office to inspect the cooling system and have this issue corrected.

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

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

Door lock cylinder - 2004 Honda Accord

Hello. You should be able to replace the original key without an issue. The problem would be getting it programmed to work with your car. It would be better to get the lock fixed just in case the remote stops...

car starts only when held in cranking position.

Hi Juan. Thanks for contacting us tonight. Typically this issue happens because the electrical circuit from the ignition switch, to the starter is not completed, so when you let go of the key in the forward position, power will stop...

While highway driving, car stopped accelerating & became inoperative

This message indicates there is a problem in the anti-lock braking and/or electronic stability program system. If the problem is severe enough, the vehicle will go into limp mode, as you experienced. The root cause could be anything from a...

Related articles

What Do Hose Clamps Do?
Hoses Hoses are used throughout the engine, any time there’s a need to transport fluid from one point to another. Your radiator uses hoses, your heater uses hoses (it’s technically part of the coolant system). Your power steering system uses...
P0156 OBD-II Trouble Code: 02 Sensor Circuit Malfunction (Bank 2 Sensor 2)
P0156 P0156 trouble code definition Oxygen Sensor Circuit Malfunction (Bank 2 Sensor 2) What the P0156 code means The purpose of the oxygen sensor is to monitor the amount of oxygen present in the exhaust and relay this information to...
P0236 OBD-II Trouble Code: Turbocharger Boost Sensor A Circuit Range/Performance
P0236 code definition Turbocharger Boost Sensor A Circuit Range/Performance What the P0236 code means P0236 is an OBD-II generic code that is...