Q: Coolant does not return to radiator after cool down

asked by on

Original problem: Temp would rise sitting at stop light but would return to normal when moving. I figured the coolant was at its limit and had it "flushed" and filled at sears. New Problem: coolant will not return to radiator after cool down. Car does not overheat unless i do not drain reservoir back into radiator manually. I drive 1 1/2 hours to work everyday and the reservoir will be almost full everyday. I had a suspicion sears did not "flush" the system so i did it myself and back flushed a golfball size gelatin goober out of the system and it did pretty good for 3 months or so with very little filling of reservoir and now the problem is back again. Brought it to a mechanic and he said he sees nothing wrong except my tranny was starting in 2nd and getting to 4k rpm (which is what it does when u put the CVT into manual shifting) so i told him he was a moron and should learn how to drive the car before trying to work on them and am now looking to find answers. Thanks

My car has 155000 miles.
My car has an automatic transmission.

Hi there. Coolant is circulated through your engine block, heater core and back to the radiator thanks to the water pump. If the coolant does not circulate back to the radiator to be cooled, it is either due to an obstruction within the coolant system (typically the heater core - especially if your heater is not working) or the water pump is not working. An overheating problem is very serious, so I would recommend having a professional mechanic come to your location and complete a car is overheating inspection.

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
  1. Home
  2. Questions
  3. Coolant does not return to radiator after cool down

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: Throttle position sensor - loose connection? 2012 Ford Fusion

Hello - yes, it is possible that the electrical connector for the throttle position sensor has a loose or poor connection. It is more likely that the throttle position sensor is failing. It has redundant circuitry, which accounts for some...

Q: Car remote unlocks doors but doesn't disable alarm. 2011 Mitsubishi Endeavor

Hi there. In many cases, when an aftermarket device is added to your security system, it can trigger an error code that is stored in the ECU which can cause the issues you're experiencing. However, even removing the system will...

Q: Q: Exhaust manifold

Hello. Thank you for writing in. This procedure can be difficult to accomplish for several reasons. One, if you are not set up correctly, then you could be working against yourself. Make sure you have the exhaust manifold propped up...

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...
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 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...