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post #1 of (permalink) Old 01-24-2001, 06:35 PM
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Temp gauge up+down G16A 8V

I have a minor (hopefully!) problem with my little Escudo (Vitara etc).
This is a 1600cc 8 valve motor version...single point injection.

The thermostat failed last week (fortunately open) so we had to
drive a few 100km with the engine cold. I replaced the thermostat
the next day and went for a run keeping a close eye on the guage.
I noticed 2 things:

Firstly the indicated temp is now lower (was 1/2 way, now 1/4-1/3),
and secondly I see the needle slowly rising then rapidly falling from 1/4
back to 1/3. This happens at constant cruise at about once a minute. I
guess that as the water in the manafold heats then the thermostat opens
and a pulse of cold water flows thru and the thermostat closes again. Now
I've never seen that happen before on any car and I'm worried that it will
damage the head. I did further sluething:

I tried another new thermostat and even resurrected the old one
(same results). I tested the gauge by using a fixed resistor (stable) and
measured the resistance of the sender when operating (I see it fluctuate
as did the gauge).

All thermostats had 82deg stamped on them although I understand
88 is not uncommon for this model, perhaps my original was mis-

Heater works well.

I checked the flow thru the radiator (fine) and checked that the
pump is working well (good flow when warm).

My concern is that I may damage the head if indeed this fluctuation
is not normal. Any ideas appreciated.

Many thanks

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post #2 of (permalink) Old 01-24-2001, 08:20 PM
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Re: Temp gauge up+down G16A 8V

usualy when guages change rapidly-suspect a ground problem
i don't know on your car,but on sammi's there is a ground
wire on the thermostat housing from the same part of the
wiring harness that the temp is hooked to. might look at that--oldzuki

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post #3 of (permalink) Old 01-24-2001, 11:17 PM
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Re: Temp gauge up+down G16A 8V

If the ohms readings from the temperature sending unit are going up and down then I would have to believe that it is water flow. Don’t know your engine at all but, I know that some engines can get an air pocket in the system after service. Good luck and let us know what you find.

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