I have 1999 4.6 and I have recently been experiencing some major fluctuations in the stability of the interior heaters. If I set the blower temp on 'low' on the screen for instance, I will get some cold air on one side but the other side of the screen is blowing hot (engine warm of course). Even when I set all the vents to cold, one will blow hot somehow.
It tends to run cool until I set the control to HI. The aircon os set to OFF with the light on. The problem is constant.
The expansion tank need a little top up the other day and I was thinking 'head gasket' but have not checked for oil i the water etc yet. But, the engine temp is totally stable.
Does anyone have any ideas what might be causing this please?
It tends to run cool until I set the control to HI. The aircon os set to OFF with the light on. The problem is constant.
The expansion tank need a little top up the other day and I was thinking 'head gasket' but have not checked for oil i the water etc yet. But, the engine temp is totally stable.
Does anyone have any ideas what might be causing this please?
