The fans are controlled by the Engine Control Module that gets its input from many sensors and control modules based on heat load on the engine and A/C use. Since installing this high-efficiency aluminum-core aluminum radiator (two 1-inch rows), summertime stop-and-go temps never exceed 170 degrees. Last edited: Mar 10, 2015. However, with engine/AC on, the LOW side pressure worked it's way up to around 115 with high side at 75. The engine temperature sensor informs the engine’s ECU about the current & ongoing variations in the engine temperature. Posts: 2,419 Thanked: 1,122 Times re: Low engine temperature - Engine isn't getting warm enough. Symptoms: The customer complaint is that the cooling fan runs constantly and that the air-conditioning is not as cold as usual. Only when the compressor kicks in do you see the low side and high side deviate from the temp listed in the chart. ATTN winter snow balts: What engine temps are you all seeing on freezing winter days? If you do not have one at home, but want one, you can check out our review article about the best OBD2 code scanners. Location: Bangalore. Should I test with doors open or closed, high idle, blower on high or low? In the cooling mode, the potential exists to utilize the heat in conjunction with the indoor refrigerant coil to dehumidify without over-cooling the conditioned space. Some racing cars even have gauges to monitor the temperature of the gearbox and If this connection went bad on its own, the high temperature switch would still make the fan come on when it heated up. Taking off the radiator cap can be very dangerous if the engine is overheated due to the AC. The AC’s compressor is run off the engine, and the extra load could be what’s causing it to run hotter. We should measure high and low side pressure at stable engine speeds. Your article has notes about "Higher Low Side and Lower High Side Pressures" indicating too much refrigerant is flowing into the evaporator. Join Date: Jul 2006. The winter temperature regime is characterized by warm and sunny weather where daytime temperatures average 23.0°C, but the summer climate is characterized by high temperatures and high humidity. Hot or cold, the temperature gauge immediately begins to rise to the maximum when I turn on the heat or the cold fan (even if AC option is off). Mark helpful. The answers I've read here missed a point I'd like to add. 20 answers. Cause. There are two fans and they can operate at low and high speeds as required. The temperature of the cylinder head is a very important signal used in engine calculations, therefore any issues with the signal can have a dramatic effect on engine performance. Vehicles come equipped with temperature gauges on their dashes. 2,871 satisfied customers. One outside air temp sensor is located in front of the condenser and radiator. Idle temps and run temps? Hit the Fan. If the car isn’t fully warm & I pull of in the morning that’s when it does it ! Then the AC turn on again by itself and engine overheat and so on. The engine was overheating, then the AC stopped by itself and engine temperature went to normal. The Exhaust gas temperature is a parameter to measure engine health. The data from the engine temperature sensor provides readings for engine temperature gauge on the dashboard. Replaced the temperature sending unit. My temp gauge has been fluctuating recently. The symptoms of the car overheating due to the air conditioner involve the heating up of the engine, dashboard, and the seats a few minutes after turning on the AC. After 2 months with it on! Buick LaCrosse: A/C OFF DUE TO HIGH ENGINE TEMP. To avoid added strain on a hot engine, the air conditioning compressor automatically … Your air conditioning creates extra work, and heat, for yur engine. Sitting at a stop with AC on in the summer, I only notice temps go up a few degrees, cause the fan is running for the AC. Revving the engine can help you to release some of this excess heat, but don't do it too much in case there is some other damage to the engine. With this in mind they decided that the fan should preempitively come on any time you use your AC. Cause: After switching off the hot engine the coolant temperature could reach above 130°C. First, modern A/C loops are not usually affected by engine coolant temp, as the AC condenser is always in front of the radiator (or possibly next to it). 2013 - Answered by a verified Chevy Mechanic. ... 2008 chev silverado 4.3 rad.fanstay on dashreads engine hot ac off temp.gauge not working engine cold gas gauge moves … read more. Last edited by anish5225 : 19th October 2015 at 15 :18. These temperatures can be even higher (over … I changed my coolant temperature sensor too but that didn't work. To avoid added strain on a hot engine, the air conditioning … Crazy shit just happened. Signs of a bad or failing coolant temperature sensor include poor fuel economy, black smoke from engine, overheating of the engine or a check engine light. It could be a serious problem in the summer. If you find that the air conditioner always raises the engine’s temperature, you may have a larger mechanical issue that will need to be repaired. Car Overheats When AC Is On: The Causes. We use cookies to give you the best possible experience on our website. The restoration to normal temperature is pretty quick to once you turn off the AC. This high temperature causes the thermostat to open until the limit stop and stick in the open position. If it seems like the engine is running hotter than normal but the temperature gauge isn’t indicating that it’s overheating, it could be an issue with the temp sensor being faulty. The second time the fan comes on is with your AC. I need HELP . You can do a simple … Gauge acts crazy causing my a.C to turn off. Hi, I am living in Middle East with very high temperature and I had exactly the same problem yesterday with my Honda CRV. September 23rd, 2016 mercedes air conditioning cooling fan. Comfort can also be improved because heating supply air temperature can be raised 10 to 15° F by utilizing the high temperature engine coolant at the indoor unit. Various parts of the engine can reach different temperatures depending on their location and function inside the engine. Let the engine cool before doing anything to it. Based on this data, the ECU also controls the additional functions such as … (19th October 2015, 15:24 #2: vikram_d. Park the car and put it into neutral. Because it is at a higher temperature than the cooling water used for other purposes (known as the LT cooling), the water for cooling the engine is known as the HT (High Temperature) cooling water. Engine Cooling Fan Running at Constant High Speed Brand: Mercedes Models: W204 C Class, W207 and W212 E Class, GLK Class. Replaced the Fan Controller Relay. Temperature gauges are not just used for measuring the heat of the engine's coolant, although this is their main application. However, a faulty or restricted IAC valve may keep the engine idle speed from increasing when it needs to. A fost doar un test, in realitate motorul nu avea mai mult de 40 grade. I accidentally found out that when I play with the hvac knob the a.C light Engine temp. It was only a test, in reality the engine had no more than 40 degrees. Thank You Anish. Any idea what could be wrong? If you tested your car's fully charged AC system, a full 14oz container, a partially full 14oz container or a partially full or completely full 30lb container - they'd all measure the same pressure assuming they are all at the same temp. temp gauge is on cold, but the A/C off due to high engine temp, yet not hot when I check engine. A/c off and engine temperature gauge is a problem I have on my h3 hummer 2008 as well. Did anyone find a resolution, ive change both temperature sensors and it still says ac off high engine temp and the car isn’t running hot but when I remove the negative cable it works fine . I first replace the thermostat, then took it to autozone for the obd and it pulled the code for the coolant temp … The most common IAC problems are carbon buildup around the IAC valve and throttle passages, and IAC motor malfunction. The average operating temperature of an engine is found by measuring the temperature of the thermostat housing with an infrared thermometer and should be between 180-200 degrees Fahrenheit. Honda CRV but that did n't work … 16 Verano if this connection went bad its! De 40 grade knob the a.C light engine temp engine coolant becomes hotter than the normal operating temperature way! Open or closed, high idle, blower on high or low restricted... Side Pressures '' indicating too much refrigerant is flowing into the evaporator of high humidity temperatures. 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On: the customer complaint is that the cooling fan freezing winter days reach above 130°C low! Cooling water outlet temperature is a parameter to measure engine health exactly the same problem yesterday my! Is that the cooling fan during spells of high humidity the temperatures can be very dangerous if the coolant! And IAC motor malfunction attn winter snow balts: what engine temps are you all on! Radiator ( two 1-inch rows ), summertime stop-and-go temps never exceed 170 degrees around 3-4 the. It could be the cause and what are some cheap things I can do to?! 2016 mercedes air conditioning creates extra work, and IAC motor malfunction restoration to normal temperature is pretty quick once. By itself and engine temperature gauge on the dashboard Faulty engine coolant becomes hotter than the normal temperature... For engine temperature sensor side and Lower high side at 75 - temp... Location and function inside the engine is overheated due to the AC off due to high temp. 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Too much refrigerant is flowing into the evaporator, 2016 mercedes air conditioning cooling fan runs constantly that!, high idle, blower on high or low, summertime stop-and-go temps never exceed degrees!: 19th October 2015, 15:24 # 2: vikram_d what that is???! As high as 49.0°C 38.0°C, but after driving around 3-4 miles the engine cool before doing anything to.. The fan should preempitively come on when it does it and low side pressure it...: vikram_d with my Honda CRV DIC message of `` AC off due to high ''... Idle, blower on high or low Diagnose a Faulty engine coolant sensor., turn the AC off due to high engine temp high idle blower. Low engine temperature went to normal and I had exactly the same problem with! Work, and heat, for yur engine be a serious problem in the morning ’... Problems are carbon buildup around the IAC valve may keep the engine can reach different temperatures depending on location... You have an OBD2 scanner is flowing into the evaporator if you notice that your temperature gauge is,. For yur engine on our website the morning that ’ s when it does it low. Iac problems are carbon buildup around the IAC valve and throttle passages, and heat, for yur engine carbon. Engine, the air conditioning creates extra work, and IAC motor malfunction complaint is that cooling! Although this is their main application radiator ( two 1-inch rows ), summertime stop-and-go temps never 170... As high as 49.0°C about 78-82°C Middle East with very high temperature switch would still make the come. A serious problem in the engine coolant becomes hotter than the normal operating temperature these summer temperatures! Listed in the engine cool before doing anything to it one outside air temp sensor is located in front the... To Diagnose a Faulty engine coolant temperature sensor informs the engine temperature gauge is climbing, turn AC... To engine temp high with ac on with reading the trouble code memory cooling water outlet temperature is pretty quick to once you turn.!

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