Dave222 Posted June 27, 2008 Share Posted June 27, 2008 I am having overheating problems that seem to be getting worse by the day. I have changed the stat tonight and the symptoms are the same, the car is fited with a Greddy water temp gauge with the sensor fitted in the top radiator hose. The problem is this, when driving at speed the temp seems OK around 90 but as soon as I slow down or stop the temp creeps up and just keeps going untill you start moving at speed and then it now takes ages for the temp to come down a few degrees, I have not let it get above 110 on the gauge but I am sure it would just keep going. The car is fitted with a fluidyne rad with new cap, new stat and I don't think its air locked. I have run the car on idle with the rad cap off and there doesn't seem to be any flow (that I can see) in the top of the rad My questions are could it be the water pump not pumping ? is there any way of testing it. Any help much appreciated Cheers Dave Quote Link to comment Share on other sites More sharing options...
Billy Posted June 27, 2008 Share Posted June 27, 2008 (edited) what is the standard temp gauge showing i run twin electric fans that cut in at 92 first fan 97 second fan on a sensor in the bottom hose so my top hose is over 100 not had any problems with this set up in the last 2 years i also have an electric water pump if i disconect it so it does not circulate the gauge goes throw the roof in a matter of seconds Edited June 27, 2008 by Billy (see edit history) Quote Link to comment Share on other sites More sharing options...
Nic Posted June 28, 2008 Share Posted June 28, 2008 (edited) Is it actually boiling over though? Is the standard temp gauge going into the red? If not, it sounds quite normal, at speed the temps will be lower as the rad has a lot of airflow through it, when you slow down/stop the airflow is reduced so temps will rise. When you take the cap off and raise the revs (just manually push on the throttle pulley), you should be able to see the fluid circulating. Edited June 28, 2008 by Nic (see edit history) Quote Link to comment Share on other sites More sharing options...
Dave222 Posted June 28, 2008 Author Share Posted June 28, 2008 Thanks for the comments guys but, this issue seems to be getting worse, that is the fluid temp is up to 100 and rising after only a couple of miles journey and then waiting at a couple of sets of traffic lights, surely at some point the viscious fan should get this rise under control and start to bring it down as at idle the heat input into the coolant must be far less than when under power. I have tried revving car with rad cap removed and even after the stat is open there seems to be very little flow evident in the rad, I would have thought you would get a serious flow with the engine at 2500-3000 rpm?. Any comments Quote Link to comment Share on other sites More sharing options...
creative Posted June 28, 2008 Share Posted June 28, 2008 the overheating in traffic sounds like the viscous is on its way out. as a quick test, once its upto temp get a rolled up newspaper and try to stop the fan. If it lunches the paper, its fine. If you can stop it spinning fairly easily odds are its on its way Quote Link to comment Share on other sites More sharing options...
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