JCB 310s heater

[pbg somerset]

I find I need the air con on to demist the glass as soon as heater is on , full time on this machine , even when machine is fully warm and has been used for a while , as soon as the air con is turned off the windows start to mist up . Is this normal for these machines or is something else causing it ?

 

[Lincs Lass]

Any wet floor mating or coats behind the seat ,,could be drawing damp air in

 

[davidroberts30]

Drain tube from the evaporator blocked
I bet the matrix is very dirty

 

[milkloss]

Also check the ducting (u shaped plastic bolted to bottom of cab) hasn’t come detached and become a gutter for water. Roughly rebolted ours and filled all the voids with silibubble.

 

[milkloss]

Drain tube from the evaporator blocked
I bet the matrix is very dirty

We wrote the manual on solving that problem didn’t we?

 

[Mursal]

As above if your not loosing coolant?

 

[Richard Smyth]

Just leave the aircon on and adjust temperature to suit. Not going to hurt it.

 

[davidroberts30]

Just leave the aircon on and adjust temperature to suit. Not going to hurt it.

i bet the airflow is severely restricted due to a dirty evaporator

We wrote the manual on solving that problem didn’t we?

small multi tool and off you go

 

[Richard Smyth]

i bet the airflow is severely restricted due to a dirty evaporator
small multi tool and off you go

Entirely possible. I still wouldn’t turn the aircon off though. Never have in anything I drive

 

[milkloss]

Entirely possible. I still wouldn’t turn the aircon off though. Never have in anything I drive

In a well designed machine yes but in the jcb there is no filter for the air con unit. As the evaporator is damp all it does is collect more and more lint and rubbish until it’s blocked.