2 Answers. 2010 Ford F150, Radiator fan seems to be running on high more than it should. One-Pipe Steam Radiators. In hot water boiler systems, the radiators will always have two pipes attached at opposite ends of the radiator. Close the valves on the radiator, remove it and then clean out the inside with a hose until the water runs clear. Even kicks on when its a cooler day. Two-pipe steam systems usually have the steam entering through a pipe at the top of the radiator. For house heating, it should always be on its lowest possible setting. Generally, one radiator should be left without a TRV and left permanently switched on, unless the boiler is fitted with a flow meter to detect when all the radiator valves are closed. When the steam enters the bottom of a radiator (as it always will in a one-pipe steam radiator), it flows upward into the sections, displacing the air as it goes. Fan kicks on about 30 seconds after vehicle is started and is extremely loud. My dominant radiator(the one that is always on) is at the bottom of the stairs, between the kitchen and room. No doubt the cause of the overheating is the clogged radiator, but the mystery is why is it always clogged? A section is like an individual slice in a loaf of bread. [1] Dan is right again. Also stays on when driving down the highway. One pipe delivers hot water to the radiator from the boiler, and the other pipe carries cooled water back to the boiler for reheating. Always remember to check the lockshield valve on the radiator is open and that the TRV pin is not stuck down. Toyota Camry 2004 radiator cooling fan only runs a few seconds while AC is on. This is one of those frequently asked questions, I have put the answer in FAQ at top of this page. I think it has a radiator cooling fan issue. I don't really spend much time in the kitchen because I don't do much cooking. If the radiator gets hot, fan one runs at full speed due to the closed contacts of K1, as the condenser fan, as K2 will also deenergized putting a full 12 volts acrossed it. This appears to put the condenser fan in series with fan number one if the radiator temperature is low and the AC is kicked on. One of them has, I assume, a sticky valve, as every so often the radiator bangs like a bugger (it sounds like a badly-balanced washing machine on spin cycle). One-pipe steam radiator sections often are connected only across their bottoms. I had a plumber come round who told me the valves are working. Can I change that, so my living room radiator is always on? As I type this, I don't have any heating on, but my preference would be to heat my living room first. It`s the right-side radiator that is clogged. One of the radiators even gets warm when hot water on and radiator thermstat is turned off (tested with heat on and hot water off--radiator stays cold, so valves are working and hot water is somehow getting into this radiator). If the radiator is cold at the bottom it could be sludge in the radiator. 3 different mechanics from John Deere came over to try to figure it out. This special radiator may be a bathroom towel rail (where the heat is always likely to be useful), or … It's toyota camry 2004 XLE 4 cylinder. Kind of like half speed operation. Thought the fan was supposed to kick on when it reached a certain temperature then goes off once the temp drops. As the title implies, one of them is pristine clean, and the other one is completely clogged up. mind you I cant find it so here it is. 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