jp7 Posted November 10, 2002 Share Posted November 10, 2002 Hi all, a couple of times recently the temperature on my 1.8k has suddenly jumped up to just below the red and the fan seems reluctant to come on. The first was climbing the long hill by junction 8 m25; the second coming off a motorway, where i'd been doing a constant 4500rpm, to a standstill at traffic lights. Engine is standard, and there's no air locks. Anybody got any ideas? Cheers Andy Link to comment Share on other sites More sharing options...
John Howe Posted November 10, 2002 Share Posted November 10, 2002 Andy, are you really sure about "there are no air locks". JH Deliveries by Saffron, the 222bhp yellow Sausage delivery machine Link to comment Share on other sites More sharing options...
jp7 Posted November 10, 2002 Author Share Posted November 10, 2002 Hi John, great sausages. I've had it bled with the front of the car in the air, and the heater on. The water level is up to the expansion hole in the top of the radiator, and the expansion bottle is up to the mark. I cant see where an airlock could be. Cheers Andy Edited by - andy perry on 10 Nov 2002 13:49:55 Link to comment Share on other sites More sharing options...
alicat Posted November 10, 2002 Share Posted November 10, 2002 Mine had similar symptoms - running warm, and no fan cutting in. The airlock was in the top of the rad - no water around the fan sensor, so it didn't cut in. Have you shorted out the sensor to see if the fan functions 🤔 Link to comment Share on other sites More sharing options...
V7 SLR Posted November 10, 2002 Share Posted November 10, 2002 Radiator fan switch is a known point of failure. Mine's never given up, but plenty have on the Se7ens Tours each year. Many people who suffer repeated problems of this type ("repeated", as in change the damn switch and it still fails) end up fixing a temporary manual override switch under the dash until they can get a replacement. Some have made that a permanent feature and fixed it into the dash. Although I've never had this problem I've decided I've chanced it long enough and I've wired my fan to the Emerald M3DK which can control the fan. You can alter the switch on/off settings at your choice in the software. Worcs L7 club joint AO.//Membership No. 4379//Azure Blue SLR No. 0077//Se7ens List Tours Link to comment Share on other sites More sharing options...
scooby dooby doo Posted November 11, 2002 Share Posted November 11, 2002 it can take several attempts and a few miles to get all the air out. It often seems to collect at the top of the rad. So its worth bleeding it from there again. HOOPY 500 kg R706KGU Link to comment Share on other sites More sharing options...
WindyMiller Posted November 11, 2002 Share Posted November 11, 2002 Andy, Had a similar problem, did the same as you, tried the switch shorted and it went, so the switch is a possible as mentioned above. Still waiting for the replacement though! Andy Link to comment Share on other sites More sharing options...
jp7 Posted November 12, 2002 Author Share Posted November 12, 2002 Hi all, definately no air in there. I was chatting to Mick Smith who said it may be a function of the radiator over cooling the water ( It's only happened recently when the air temps have dropped ). It goes like this. The thermostat closes, water heats up in the engine, thermostat opens and allows cold water in, thermostat closes abruptly as water temp to low, hence the water in the engine gets hotter and hotter. This he says is a problem with the caterham setup of thermostat on the inlet and temp sensor on the outlet. His solution is to blank off the radiator a bit in winter to cut down its efficency. Sounds plausable to me. Cheers Andy Link to comment Share on other sites More sharing options...
Alex Birtwisle Posted November 13, 2002 Share Posted November 13, 2002 I am suffering the same symptoms as you Andy ☹️ Did the reduced airflow/heat transfer through the radiator work 🤔 Cheers Alex B S713UMY 1.8K Viper Blue Link to comment Share on other sites More sharing options...
jp7 Posted November 14, 2002 Author Share Posted November 14, 2002 Hi Alex, haven't tried it to tell the truth as i'm now into winter upgrade mode! But Mick says it cured his problem. He used a bit of cardboard across the lower half of the rad. cheers Andy Link to comment Share on other sites More sharing options...
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