Coolant go to workshop, needle jumps and AC blowing hot air
Thread Starter
Newbie
Joined: Sep 2017
Posts: 6
Likes: 0
From: Oaxaca Mexico
C280 W203
Coolant go to workshop, needle jumps and AC blowing hot air
I have an w203 C280 luxury, and sometimes in the dashboard appears an indicator "Coolant, go to workshop", immediately my temperature needle jumps from 84 to 90 or above (it will increase to 120), and when this happens, my AC blows only hot air. No codes thrown!!!! What should i do??
Thread Starter
Newbie
Joined: Sep 2017
Posts: 6
Likes: 0
From: Oaxaca Mexico
C280 W203
Super Member
Joined: Feb 2007
Posts: 809
Likes: 74
From: Dallas, TX
2008 E63 wagon (1 of 62)
have you actually scanned the car for fault codes or are you just not seeing any check engine light warnings on in the cluster? The fact that the needle is bouncing around like you say would lead me to believe there is an air pocket in the engine cooling passages or possibly the coolant is not moving through the engine properly and is boiling inside the engine. You can always try to warm the engine up from cold and check the radiator hoses at the top and bottom and see whether they are about the same temperatures or whether they are cold on one side and hot on the other after the car is warmed up.
Any other guesses would include a faulty water pump or a sticking thermostat.
Any other guesses would include a faulty water pump or a sticking thermostat.
Thread Starter
Newbie
Joined: Sep 2017
Posts: 6
Likes: 0
From: Oaxaca Mexico
C280 W203
have you actually scanned the car for fault codes or are you just not seeing any check engine light warnings on in the cluster? The fact that the needle is bouncing around like you say would lead me to believe there is an air pocket in the engine cooling passages or possibly the coolant is not moving through the engine properly and is boiling inside the engine. You can always try to warm the engine up from cold and check the radiator hoses at the top and bottom and see whether they are about the same temperatures or whether they are cold on one side and hot on the other after the car is warmed up.
Any other guesses would include a faulty water pump or a sticking thermostat.
Any other guesses would include a faulty water pump or a sticking thermostat.
Senior Member
Joined: Jul 2011
Posts: 408
Likes: 40
From: Hawaii
2017 GLA 250, 2011 C63 P31 (p30 w/ lsd) (in repair), 2005 C230 Sport Eurocharged, 2003 C320~sold
check your radiator cooling fan when this is happening; it usually would have stopped working and can be many things causing it--anywhere from just a fan that went bad to shorted wiring to the fan; the control unit for the fan is in the housing itself
