Low coolant

Asked by Mar 19, 2016 at 09:00 PM about the 2005 Chevrolet Silverado 2500HD Extended Cab LB RWD

Question type: General

I just replaced the head gasket and water pump
and thermostat and I'm still getting a low coolant
light come on and I noticed that the temperature
isn't getting above 160 this is on a 05 duramax

4 Answers


With all the work done, did you burp the system to make sure all the air is out of the system? Are the sensor connections good? If you are around or under 160 degrees the warring lights should not be coming on. I'm sure you know that. So a sensor is bad, or the area the sensor is at is not getting the proper cooling flow. When you replaced the head gaskets, did you check to make sure all the water openings are not blocked by the new gaskets? Replacement head gaskets are universal on some gaskets, and may not have openings to all the water jacket holes. You may have more that a gas engine since it is a diesel engine. Ask whomever put the gaskets on if they checked to make sure all the openings were opened. It has happened more than once. I'd start with a new sensor first. faster and cheaper. Also make sure the connections are good.

1 people found this helpful.

They have burped it 2 times now. It might be more like 140. Call the owner of the shop and gonna have them go back over it all. Its sucks they have had my truck for over a month now.

Someone else told me they might have put the thermostats in wrong. Said that their different. Does that make any since. I dont know much but I know it's getting expensive.


Thermostats open to allow coolant past when the coolant gets hot against the thermostat. Put it in upside down and it acts as a blockage and you have serious overheating. Forget a thermostat or one that is stuck open, the water flows too fast to cool properly in the radiator. That may give a hot signal on the sensor. They should use a heat gun to find out where the hot spots are. Have the radiator hoses been changes over the 11 years of the cars life? Old and tired radiator hoses can expand or collapse slowing the flow of coolant, then pop open and send a rush for coolant through the system. That gives strange readings also.

Your Answer:

Silverado 2500HD

Looking for a Used Silverado 2500HD in your area?

CarGurus has 29,396 nationwide Silverado 2500HD listings starting at $2,795.


Chevrolet Silverado 2500HD Experts

  • #1
    Steven Loeffler
  • #2
    Tom Demyan
  • #3
View All

Related Models For Sale

Used GMC Sierra 2500HD
158 Great Deals out of 17,885 listings starting at $2,999
Used Ford F-250 Super Duty
456 Great Deals out of 38,177 listings starting at $1,999
Used Chevrolet Silverado 1500
1,765 Great Deals out of 155,976 listings starting at $1,700
Used Dodge Ram 2500
135 Great Deals out of 4,790 listings starting at $1,999
Used GMC Sierra 1500
807 Great Deals out of 60,793 listings starting at $1,500
Used Ford F-150
2,319 Great Deals out of 189,659 listings starting at $1,300
Used Ford F-350 Super Duty
333 Great Deals out of 22,160 listings starting at $2,995
Used Chevrolet Silverado 2500
124 listings starting at $5,995
Used Chevrolet Silverado 1500HD
15 Great Deals out of 252 listings starting at $2,400
Used Toyota Tundra
477 Great Deals out of 38,192 listings starting at $2,050

Used Cars For Sale

2018 Chevrolet Silverado 2500HD For Sale
14 Great Deals out of 17,601 listings starting at $24,737
2017 Chevrolet Silverado 2500HD For Sale
13 Great Deals out of 1,366 listings starting at $24,369
2016 Chevrolet Silverado 2500HD For Sale
42 Great Deals out of 1,577 listings starting at $22,900
2015 Chevrolet Silverado 2500HD For Sale
58 Great Deals out of 2,011 listings starting at $14,900
2014 Chevrolet Silverado 2500HD For Sale
25 Great Deals out of 522 listings starting at $8,861

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.