[ROVERNET - UK] 3500S Questions

peter king peter at king-co.com
Fri Dec 17 15:06:19 GMT 2004

Hi Randy.

I've just replaced the heater valve on my 3500s, and on mine the outlet pipe
leads to the valve, then back to the radiator. I wonder if this is correct,
as the A/C unit has been removed and the fitting leading to the top right
side of the heater unit is not connected. There is a small vacuum line at
the back of the heater valve, and a capillary temperature sensor which
apparently leads to the A/C control unit, although I haven't been able to
confirm that. The replacement unit I found has no fitting for the capillary.
If the valve serves as a thermostat to regulate the temp of the coolant
entering the heater, then it would make some sense that the outlet would
lead to the heater unit.

The mystery is that I get heat (not very strong) with it connected as it is
now, leading me to also wonder what the valve is designed to do?

I look forward to more informed responses than mine...


 12/17/04 7:29 AM, NOBLIOUS at aol.com at NOBLIOUS at aol.com wrote:

> I tried sending this a few days ago but I didn't get it back, so let me try
> again. 
> I have a couple of questions:
> - does the coolant from the outlet pipe at the back of the intake manifold go
> through the heater valve? It seems like the valve has a bypass pipe that leads
> to the heater core. How does that valve work?
> - where does the vacuum pipe for the "auto park" on the wiper motor connect?
> Is it to the vacuum port on the rear of the intake manifold?
> - the ROM states that "all air is cooled and dehumidified by the AC system",
> even when the heater is on. Is that true? Sounds very inefficient to me.
> Thanks much.
> Randy - Miami, FL, USA
> 1970 3500S
> 1973 Stag
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