[s-cars] radiator fan works without relays!?
kbogach at comcast.net
Wed Mar 30 00:31:27 EST 2005
Thank you very much for your response. I don't know how I managed not
to find this info on SJM site. I have tried. SJM also explains why I
am so puzzled after seeing electric diagrams on Bentley CD -- after run
system is missing from it. I will look at the sensor and relay
tomorrow. Thanks again.
Paul Gailus wrote:
>It's possible that your after-run relay is bad. This relay turns on the
>auxiliary water pump and also turns on the fan (at low speed)
>when the after-run temperature switch closes.
>You can scroll down on the page from SJM at the link below
>and see a picture of this brown colored after-run relay.
>Try pulling this relay to see if the fan stops. If it stops, then the relay
>may be bad. I have heard of others who've had this relay go bad.
>But before you buy a new relay, you should also try pulling the
>wires off of the after-run temp sensor at the bottom of the coolant
>manifold (under the intake manifold). If the fan stops running, then
>this temp sensor is shorted. One of the 2 wires to this sensor goes
>to 12V, so be careful not to short it to the engine ground.
>If the relay is working properly, the fan should turn on when you
>short these two wires together (but be off when they're not shorted).
>----- Original Message -----
>From: Konstantine Bogach <kbogach at comcast.net>
>To: <s-car-list at audifans.com>
>Sent: Sunday, March 27, 2005 10:52 PM
>Subject: [s-cars] radiator fan works without relays!?
>>My S4 '98 developed a problem - radiator fan works non-stop. Today I
>>finally found time to look into it (I drive 200tqa '89 last 3 month).
>>Hooked up battery charger - it runs, unplugged radiator temp switch - it
>>runs. Left it unplugged. Removed relay 2 - it runs, plugged it
>>back. Removed relay 3 - it runs !!!! Looking at the electric schema
>>on the Bentley CD I am totallly puzzled. It shows two motors
>>actually. Is it 2 stators in one case? Anyway, they both are powered
>>through relays 2 and 3. I did not try to remove both relay at the same
>>time, but all sensors except radiator switch can close either one or
>>another relay and the rad. switch was unplugged. So, sequential removal
>>should be sufficient, according to the schema. Can it be that my car
>>has different wiring than CD?
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