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posted on July 9, 2006, 12:54 pm
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Hi,
I have a saab 1999 93 2.0 injection non turbo, non air
conditioned, which recently burst the main coolant pipe which was
weathered. I've replaced this and have since been worried that the
radiator fan may not coming on when it should.
When should the radiator fan come on. Normal operating temperature is
halfway up the temperture gauge. So I guess it should not come on as
long as it stays around this. How far up does the temperture needle
need to go before the fan should kick in?
I've checked the fuses and relays and all seem fine. I've cleaned and
dried the connector going to the radiator fan. After a drive i noticed
the fan was not on so i opened the bonnet and moved the wires about a
little. I left it for a few seconds and the fan then came on, for
about 1 minute, but i wasn't sure if it just kicked in or if it was a
loose connection. This is one of the few times i have ever seen the
fan on. So the fan itself does function.
Does it sound like a problem?
I'm quite concerned in case the engine overheats and screws up the head
gasket.
I'm trying to rule things out - There is some sort of sensor mounted on
the front of the car just below the grill and in front of the radiator?
It's made by siemens and about the size of a 50 cent (euro) coin, What
is this? Is it related to the fan functionig?
Hope somebody can help - Thanks for the help in advance.
Re: Radiator Fan - help/question
timmy wrote:
The radiator fan should go on and off even at normal operating
temperature, especially in summer or urban traffic. I had a similar
problem on an old 9000 quite some time ago. AFAIR it was some
malfunctioning relay, but I don't know anything more specific. Take a
look at the relays, maybe you notice something suspicious.
--
Marco Senft
http://www.t2g.ch /
Re: Radiator Fan - help/question
I confirmed that the relay was working correctly by changing it with
the relay for the full beams, which is of the same type. Both seemed
to be working fine.
So as far as I can determine it doesn't appear to be the fault of the
relay.
Any other suggestions welcome from people who have had a similar
experience.
Marco Senft wrote:
Re: Radiator Fan - help/question
timmy wrote:
That isn't the fan temp sensor, it might be an external air temp sensor.
A thermo switch controls the fan. They get old and work intermittently or
not at all. Trace the fan motor wire back to it. The thermo switch screws
into the radiator tank (where it senses the water temperature).
Re: Radiator Fan - help/question
There is a sensor in the expansion bottle which holds the water. do
you think that this sounds like it. There doesn't seem to be any other
sensor in the radiator.
Is this the same sensor that sends the temperature to the temperature
gauge in the cabin?
As the temperature gauge in the car seems to be working fine.
ShazWozza wrote:
Re: Radiator Fan - help/question
timmy wrote:
The sensor in the water bottle senses low coolant level. It is not the
thermo switch.
In my car (an '89 turbo) , the thermoswitch is on the left hand side of the
radiator (when you are standing facing the front of the car). It screws
into the black plastic not into the metal part of the radiator.
As it should.
I think it is best if you visit one of the Saab enthusiast sites on the web,
you'll probably find a picture of it there. Then the penny will drop.
Re: Radiator Fan - help/question
I live in very hot area and my experience has been that
the fan rarely operates. The only time I've noticed it
operating for many years is occasionally when coming
into the garage on an especially hot day and then only
for a minute or less. In a cooler climate you could
possibly go for years without the fan ever operating.
Re: Radiator Fan - help/question
mojaveg@iwvisp.com (Everett M. Greene) writes:
I'm in Australia and in my classic 900's, the radiator fan(s) operates often
and regularly during 'normal' driving, but of course out on an open freeway
there's much more airflow so it won't come on as often or at all.
Craig.
--
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