Q: 2013 Ford Fiesta overheating when ac is on? The air coolant has a peanut butter consistency & color?

asked by on

My 2013 Ford Fiesta is over heating only when I turn on my A/C. I also noticed that the place where the antifreeze goes is clogged up with some brown stuff that looks exactly like peanut butter, same color & consistency. I tried draining that out but there's still a lot more in there & I don't know how to drain it all out completely so I can put new antifreeze on there. No engine lights are on. But it does need a new oil change. What could the problem be?

My car has 666654 miles.
My car has an automatic transmission.

Hi There, Overheating with the AC on is generally caused by a couple of possibilities. When the AC compressor is beginning to fail, this may incur an increased load on the motor as it works harder than usual to turn a bad compressor. This increased load causes the motor to work harder than it otherwise normally would, resulting in the motor overheating. The other possibility may be a cooling system that is not working efficiently. This may be caused by a clogged radiator, blocked or clogged radiator condenser fins, a water pump that is not pumping correctly or potentially cooling fans that are not working properly.

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. 2013 Ford Fiesta overheating when ac is on? The air coolant has a peanut butter consistency & color?

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: 2010 Ford Taurus w/190K miles stalling when idle. Told it needs new timing chain and cam phaser. Is this true?

The diagnosis seems to be what may be causing the many different codes since a timing chain and phasers can cause the stalling. The cost quotes is not out of line.

Q: Problem with shifting positions

It may very well be that your vehicle has a problem that is causing reduced power output. Some such things could be: Faulty fuel pump Faulty oxygen sensor Vacuum leak When any of these occur, the...

Q: Q: Does my car have a timing belt or timing chain?

Hello there, thanks for your question. Your vehicle has a timing belt, not a chain. The recommended replacement mileage for the belt is 150,000 at which time related (nearby) components such as the water pump, thermostat, timing pulley bearings(s) and...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...