Question about 2005 GMC Sierra 2500HD 4WD

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Antifreeze low level alarm when towing. even with thermostats out.

When towing the temp comes up and the antifreeze is alarming on a low coolant level. Took both thermosttats out and it is still doing ther same thing. Is it a head gasket?

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  • Dar
    Dar May 11, 2010

    Are you adding antifreeze often?

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  • 102 Answers

For 1 put the theromsata back in, next check clutch fan

Posted on May 25, 2009

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My heating isn't working, it sometimes works but majority of the time it blows cold. Also when the engine is running, there seems to be a noise coming from the engine, could these be related? Engine temp...


No heat or low heat in a water cooled engine is worthy of an immediate check as major damage to engine could be the result of continuing to drive it. Things to check:

These two things may cause no heat and possible not ever show as a problem on the temp gauge or temp warning light until far to late:
Low coolant/antifreeze level
Frozen coolant/antifreeze
Stuck thermostat

Other possibilities that may/may not show other signs of trouble as well:
Failing water pump (this would also explain some noise, typically like a grinding, scraping or bad bearing noise)
Slipping belt (Typically associated with the famous belt squealing or chirping noise)
Clogged radiator and/or heater core
Non-operating temperature control valve
Stuck thermostat

Hope this helps!

Nov 24, 2013 | Ford PUMA Cars & Trucks

1 Answer

Overheating


Have you checked to see if the cooling fans are coming on? Is the coolant level low? Could also be a weak water pump. Does the temperature gauge appear to work normally or do you go from low temp to high temp and then back to low rather quickly? If so, it could be a bad thermostat.

May 27, 2013 | 2005 GMC Sierra

1 Answer

2000 vw beetle 2.0 L, low level coolant light...engine mil code 1256


not the pump but air in the system or a broken wire to the coolant level sensor
that sensor at the top of the radiator tank has to be completely immersed in coolant or the circuit is broken and the light comes on
same effect id the wire to that sensor is broken in the insulation

Jun 16, 2017 | Cars & Trucks

1 Answer

Vw jetta iv, temperature alarm sounds and flash with no aparent reason. temperature dial indiator is ok.


I WOULD CHECK BOTH RADIATOR HOSES TO MAKE SURE THEY ARE HOT. THERMOSTAT COULD BE STICKING SLIGHTLY CLOSED.CHECK COOLANT LEVEL MAKE SURE COOLANT NOT LOW.IF COOLING NOT BOILING OUT OF THE EXPANSION TANK. I WOULD HAVE CAR HOOKED UP TO A DIAGNOTIC SCANNER AND CHECK COOLANT TEMPERATURE SEE IF TEMP. OVER 230 DEGREES IF SO RADIATOR COOLING FANS NOT WORKING.COOLANT THERMO SWITCH BAD BOTH FANS SHOULD BE RUNNING AT LOW SPEED.IF ALL LOOKS GOOD YOU COULD HAVE FAULTY LOW COOLANT SENSOR IN EXPANSION TANK.MAKE SURE COOLANT IS IN THE EXPANSION TANK BECAUSE COOLANT LEVEL COULD BE LOW.ADD COOLANT IN THE EXPANSION TANK UNTIL YOU AT MAX LEVEL LINE ON THE EXPANSION TANK.DONT OVER FILL THE EXPANSION KEEP ADDING COOLANT UNTIL COOLANT LEVEL STAYS AT THE MAX LEVEL LINE ON THE EXPANSION TANK.

Jun 27, 2011 | 2003 Volkswagen Jetta TDI

1 Answer

LOW COOLANT LIGHT COMES ON SOMETIMES AND TEMP GUAGE SHOWS ENGINE GOING TO OVERHEAT. HEATER GETS COLD. IS IT THE THERMOSTAT?


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.

Feb 27, 2011 | 1998 Chevrolet Monte Carlo

2 Answers

New water pump, thermostat. Heater blowing tepid to cool air since replaced.


sounds to be a faulty thermostat did your car over heat my vehicle does the same thing its the thermostat when its cold out your vehicle loses all its engine temperature and blows cold air make sure you use 50/50 antifreeze

Nov 29, 2010 | 1996 Chevrolet Camaro

3 Answers

My 2000 Pontiac Grand am GT is overheating and im getting no heat from my heater. I've tried just adding coolant but it hasnt helped. I took it in to the mechanic and he thought i needed a new thermostat...


PAST BY THE LOCAL AUTO PART STORE AND GET NEW COOLANT RESERVIOR CAB MAKE SURE CLOSE NICE EVEN AND DONT FORGET THE CHECK COOLANT LEVEL. RUN THE CAR AND WAIT TILL REACH THE NORMAL OPERATION TEMP. TURN THE HEAT ON HIGHEST LEVEL GO TO ENGINE DEPARTMENT ON PASSENGER SIDE NEXT TO WATER PUMP TOP OF THE COOLANT BY PASS METAL PIPE HAS BLEED VALVE USE NUMBER 8 WRENCH MAKE IT LOSE LITTLE BE BECARE FULL WILL BE HOT. WAIT TILL COOLANT START COME OUT WITH OUT AIR MAKE THIS STEP 3-4 TIME CHECK EYE ON TEMP. GAUGE AND HEATER TEMP. USE ONLY DEXCOOL.

Jan 12, 2010 | 2000 Pontiac Grand Am GT

2 Answers

My 2003 dodge ram 1500 truck stopped heating. Cool air is all that comes out.


low radiator coolant level OR bad thermostat and Lord I hope not,a leaky heater core.Check fluid level first the look at thermostat replacement only after the level check. Good luck and bless you in advance if you should catch a cold...from the cold!

Nov 02, 2009 | 2003 Dodge Ram Maxi

2 Answers

Were are the sensors for the engine fans in a nissaan sentra gxe


One of the common things that gets missed at times is the radiator is down in cooling antifreeze. The car will act as normal during the warm up cycle and then the temperature guage will rise and then it will slowly come back down as the thermostat opens and/or the electric cooling fans come on. In actuality the engine is overheating, but it is not boiling over. The level of abtifreeze is at just the right level of lowness that you experience this phenomenon. After the engine cools off , (DO NOT REMOVE WHEN HOT - YOU CAN GET SCALDED WITH BOILING WATER/ANTIFREEZE)), remove the radiator cap and check the level within the radiator and also the antifreeze reservoir level. You can buy a 50-50 mix of antifreeze and water that is ready to put into the radiator. If the level in both the radiator and reservoir are correct, you may have a bad thermostat or some other problem.
Bob - 2003 Nissan Sentra SE-R SPEC V

Nov 25, 2008 | 2003 Nissan Sentra

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