Overheating Engine

[smartypants10101]

my suzuki ignis overheated on motorway, i had radiator changed and coolant put in thne its doing same again any suggestions the fan and waterpump are all working

[waterboatman]

Check the coolant level in the radiator header tank. There may well be an airlock.

[waterboatman]

Make sure the heater is on full. That's where airlocks usually happen. Having the heater on will help to shift it.

[TWR]

With the heater on & showing the Red ( Heat logo ) does the heater give out "Hot>>Cold>>Hot>>Cold? if so, air in the System, is the Electric fan working? this can be checked by leaving the car running, you should hear the fan coming in.

[bhg481]

I'm not convinced that the fan would be in use on a motorway - enough ram air to cool the engine.
Worth checking the thermostat.

[Khandro]

Check the thermostat is functioning, it has to open when the engine reaches the working temperature, if it doesn't open fully, you're not getting sufficient coolant circulating in the block.

[bhg481]

Further to my last post - how do you know it's overheating? If it's boiling, fine, it is overheating. If the temperature gauge says so the sender screwed into the thermostat housing could be faulty.