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Re: low coolant light always on
Low coolant means just that, find out if the system is really low or the light is receiving a false signal from the low coolant sensor, just check the level in the coolant recovery tank and the make sure the radiator tank is full, if you are low on coolant then check out why, a leak is probable, most likely a water pump or hose related issue, and no a bad thermostat will not in itself turn on the low coolant light unless the engine boils over and the system becomes low. Remember never ever open a radiator cap on a hot engine, you would be surprised how many professional mechanics get burned this way, be careful..
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use a termo laser to check temp of coolant at filler cap ,with cap off run vehicle till you have hot heat coming out of your heater then check with laser. if it reads above 140 then you know 2 things . either the therm sensor is going bad or the temp gauge is bad , make sure the radiator fans come on ,if they do and you have good heat then you have bad gauge.
Yes, the temperature gauge should normally stop in the middle, between the cold and hot points on the gauge. When the engine is cold the thermostat will be closed and will keep recirculating the coolant in the engine block until it warms up sufficiently. Then the temperature of the warm coolant will cause the thermostat to open the channel to the radiator to get rid of excess heat, which should stop the coolant from over heating. So the effect of the thermostat keeps the coolant at a fairly stable temperature. When the coolant runs low, it can't transfer enough heat to the radiator and the coolant and engine then over heats. Watch for radiator leaks under your car after you have been driving it. If the coolant goes low again fairly quickly you could have a leak in a hose or the radiator itself.
REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP.IF CAR OVER HEATING WHILE IN MOTION.MORE LIKELY ITS THE THERMOSTAT,LOW COOLANT IN RADIATOR OR COOLANT SYSTEM,BAD WATER PUMP,WATER PUMP WEEP HOLE IS LEAKING, WATER PUMP NEEDS REPLACING.CHECK ENGINE OIL,IF OIL LOOKS LIKE MILK SHAKE YOU HAVE LEAKING HEAD GASKET.IF CAR IN PARK AND OVER HEATS WHILE IN A LONG TRAFFIC LINE OR.BANK DRIVE THROUGH COOLANT FAN NOT TURNING ON, BECAUSE THE ENGINE COOLANT TEMPERATURE SENSOR FAULTY.CODE SCAN CAR FOR FAULTY COOLANT FAN RELAY OR FAULTY PCM. CHECK COOLANT FAN FUSE, AND HOT WIRE THE COOLANT FAN TO MAKE SURE ITS WORKING.IF COOLANT FAN DONT WORK WHEN HOT WIRED. COOLANT FAN NEEDS REPLACING. REPLACE BOTH RADIATOR HOSES, REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP.BUY NEW COOLANT ADD 50/50 WATER AND COOLANT.IF ENGINE OIL HAS ANTIFREEZE IN IT.REPLACE ENGINE OIL AND OIL FILTER TO KEEP FROM LOCKING UP THE ENGINE.GET CAR FIX.DONT KEEP DRIVING IF IT KEEP OVER HEATING,ENGINE DAMAGE WILL OCCUR.I HOPE INFORMATION I GAVE YOU WILL FIX PROBLEM.PROBLEM COULD BE LEAKING RADIATOR HOSES BUT CHANGE THERMOSTAT THATS FIRST THING I WOULD CHANGE BECAUSE IF IT CLOSED, ENGINE WILL OVER HEAT AND CRACK CYLINDER HEAD OR CRACK PISTON, COOLANT NEED TO CIRCULATE THROUGH THE ENGINE TO TAKE AWAY THE HEAT FROM ENGINE.
There may be a thermostat problem, but your symtoms indicate low coolant level. When coolant is too low, it will not circulate, so you get no heat in car, and the coolant remaining in engine block overheats because no cool fluid coming in.
You need to fill the system up properly then look for leaks.
With cold engine, open radiator cap. Fill with antifreeze directly in radiator. Start engine, top up rad if level drops. Put heat control on Hot. Fan on low, heat on high. Gently rev engine and top up rad as needed. IF as engine heats up, it starts kicking fuild violently out of radiator, then the thermostat is bad. if not, then recap radiator, top up overflow bottle and you're done. Look under car for any sign of leaks. Steady dripping indicates a leak, then address that.
If the motor over heats it may be the water pump. A motor will not run very far with a bad water pump or stuck thermostat. Most of the time a water pump won't quit pumping water they leak. If the motor won't get hot enough it is the thermostat.
The most common problems are low coolant level, stuck thermostat, fans not working and plugged radiator. If your coolant level is good and the fan turns on when the engine gets hot, then change the thermostat and flush the radiator at the same time because the thermostat needs to come out to do a proper flush. Hope this helps.
Many times no heat is the result of low coolant which means there isn't enough to properly flow through the heat core. Check the coolant level. If you're running hot it could also be from low coolant. If the coolant level is normal you may very well have a stuck thermostat. If you do have low coolant the next step is to find the reason why it's low.
flush your radiator first.with the thermostat out you should see the water moving if not bad water pump.this engine needs the thermostat to function properly and either a 50/50 coolant or straight coolant so it does not boil over.also make sure your fans are coming on
This is serious, as it sounds like your engine coolant is not circulating and you may already have a damaged head gasket. It's probably not a bad thermostat, because that wouldn't kill the heater. Here are some things to check, ranked from least to most serious:
1. Check for low coolant level and add if needed. Check for leaks.
2. Check for kinked radiator hoses.
3. Check for airlock. Remove bleed screw from thermostat housing. Crank engine. When no air or bubbles come out with the coolant, put the bleed screw back in. Be sure and clean up any spilled coolant so your pets can't drink it.
4. Check for bad water pump and/or deteriorated belt.
5. Check for bad head gasket, possibly damaged by overheating.