Re: '92 SW8 Intermittent Heat
From: jsgrubbs2001 (jsgrubbs@hotmail.com)
Date: Sat 23 Feb 2002 - 21:08:35 EST
The HVAC ECU controls all that stuff--located behind glove box (to
the right of the injection ECU). For reference, I think there's a
relay bolted down to one of the ECU's mounting bolts.
The HVAC ECU has measures the temperature of the heater core,
evaporator, outside air (cowl), and passenger cabin. It uses this
plethora of data to control the coolant valve and A/C compressor.
By federal law, the "default" mode must be full heat and windshield
defrost... I would think that disconnecting the coolant valve would
result in full heat.
-Joe G
--- In peugeot-L@y..., "fwbillb" <fwbillb@a...> wrote:
> Hello,
> My wagon has been getting intermittent heat, particularly when the
> weather isn't that cold. The valve is open (heat is on) with no
> voltage to the switch (wire disconnected). I was told that in case
of
> a malfunction, the default setting is heat on, but what's happening
> now disproves that.
> I switched the dashboard control: no effect. Is there a heater ECU?
> Somehow the valve is getting voltage. Could it be the ambient
> temperature sensor on the dash?
> Naturally, thanks for any suggestions or further info.
> Bill
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