Entire cooling system was dry for > 1 month. This did not happen before the major engine work earlier this fall, but I'll be danged if I can find a link. Is there another temp sensor somewhere that I am overlooking? I've looked, but don't see one. FLASHING RED temperature light means that engine is above operating temperature and you should pull over soon, 4. NO temperature light means things are normal, 3. The flashing/illumination condition of the high engine coolant temperature warning light (red) is as shown in the figure. BLUE temperature light means that your engine is below normal operating temperature, 2. The high engine coolant temperature warning light flashes at 0.5 s intervals when the engine coolant temperature exceeds the set value, and illuminates if the temperature increases further. There is no temp sensor in the top hose, so that suggestion won't work. Basically, there are 4 temperature indications. I will do so again in the morning, just in case. New coolant at that time.ĥ) Cleaned all cooling sytem electrical connectors with DeOxit.ĥ) All underhood grounds have been cleaned in the last 3 months when I installed the grounding kit. No effectģ) Confirmed proper operation of water pump.Ĥ) Replaced coolant reservoir without effect. This is the most urgent warning light because it means that your coolant and thus your engine is overheating. VAG-COM says the coolant temp is 86.4 C when cruising in 5th at highway speed.ġ) Topped the coolant reservoir to the full line, no joyĢ) Replaced the yellow/black coolant temp sensor in the front coolant flange. Coolant level seems OK.before and after driving. It wont happen if the car sits at work for 8 hours +. Its pretty cold here still (in the 20s), but only in the morning this happens until the car warms up. The coolant gauge reads normal temperature. I can count on it flashing everytime I start the car in the morning. The temperature gauge goes up to the normal position when the engine. The coolant level is good and it is not losing coolant. If I turn the engine off and on again after driving for a few minutes the light and beeping does not happen. The flashing light will continue until the engine is switched off. Usually when the car is fully warmed up, but occasionally when it is cool. The engine is cold so it is not over heating. Intermittent flashing coolant temp light. This is worth checking bad fans and other electrical problems, (like the direct power wire hack), damage, killing power to the cooling fan, are common as well.OK, I'm at my wits end. Repair involves repair of the damaged harness, extend wire length and eliminate the issue, from occurring again. You might be able to see, hear of even smell this. A coolant loss could be caused by a leak somewhere in the system, such as a split hose or a hole in the radiator. This causes the wires to be stretched, get damaged and kill power to the fan. What causes the engine coolant warning light to come on The light could be caused by several factors, but the most likely is either a loss of coolant or a fault with the sensor. This no fan power on, is known issue has been discussed quite a bit here and a vw tech bulletin, narrowed down a issue to the original wiring harness to the power plug the cooling fan, being too short. Any wiring hacks, will need to be repaired and brought back to stock temp controlled functionality. If the fan isn’t kicking on and this is the 2.5L one large fan setup, this is a known problem. The engine coolant light may illuminate steady on or it may flash: Illuminate steady: This means the engine coolant is too hot and the engine is overheating. So, is the fan power hacked and not controlled by the fcm or fan switch? What scan tool, are you using and is it vw specific? Give us the basics of the car you are working with:,year, model, type if, engine and trans. The engine temperature warning light, also known as the coolant temperature warning light, can appear on your gauge cluster for several reasons.
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