This one is a doozie. Once in a while my truck turns the heat on by itself. I can have it be set on full cold with AC, but it would shift to full hot. To correct this I would have to move the slider to hot and back to cold.
Any ideas before start digging in it?
97 FZJ80, heater control/heater bypass valve is only a year old (OEM)
I just posted under another thread on this, but it's an easy thing to check to see if the Heater Control Valve cable sheath isn't captured by the clamp properly. If its arranged as shown in this pic, the outer cable sheath can slide around with vibration and possibly allow the Heater Control Valve to open.
This one is a doozie. Once in a while my truck turns the heat on by itself. I can have it be set on full cold with AC, but it would shift to full hot. To correct this I would have to move the slider to hot and back to cold.
Any ideas before start digging in it?
97 FZJ80, heater control/heater bypass valve is only a year old (OEM)
Are you sure it goes to full hot? In my mind that means air is coming out of the vents close to 200f. If the AC just stops cooling and you flip back to ambient you may have an issue within the AC system versus the heating system.
Are you sure it goes to full hot? In my mind that means air is coming out of the vents close to 200f. If the AC just stops cooling and you flip back to ambient you may have an issue within the AC system versus the heating system.
I had a similar problem and it turneed out to be the "temperature control switch". This is the slider at the bottom of the control panel.
I ended up cleaning the internals with electrical contact cleaner and blowing gently with compressed air.
Another item mentioned is the system temperature sensor/thermocouple. It is behind the 4 little slots to the left of the slider. The system gently pulls air into the sensor through a hose the check the cabin temperature. Some have knocked off the hose behinid that (maybe while installing a new head unit).
Some peopl have toggled the "AUTO" function and had success.
The Temperature / Climate Control slider on my 1997 Lexus LX-450 does not work properly. It functions more like an on-off switch. I get AC from 64 Degrees or below and it blasts hot air from 65 degrees and above. Is this typical or is there something wrong? Any ideas on what may be causing...
forum.ih8mud.com
Others have found water damage/corrosion on the "AC Amplifier"
My ac/heater system died earlier this summer after a windshield replacement that is leaking. Heres my symptoms on a 97' Lx450 -No blower motor function -lights on the AC - AUTO and inside/recirculate air buttons would not light up (essentially the middle row on the climate control) -Lights on...
