Duramax low coolant warning

Duramax low coolant warning

A Low Coolant message may be displayed on the Driver Information Center of some Silverado and Sierra models equipped with the 6. An inspection of the radiator surge tank may appear to show a low coolant condition. The low coolant level in the radiator surge tank may be due to the fill process at the assembly plant, which cannot purge all of the air from the cooling system and the surge tank. After the engine has been thermally cycled, air rises and causes the coolant to become lower than when initially filled.

During PDI, coolant should be added to fill the upper chamber of the radiator surge tank. A coolant level that is low enough to turn on the Low Coolant message will be below the horizontal line across the radiator surge tank.

A full coolant level will show the coolant at the bottom of the radiator surge tank fill neck. If a low coolant level is found, add one quart 0. The fill cap used to fill the system is located on top of the tank. It is a non-pressurized radiator surge tank cap with left hand threads. Your email address will not be published. Your Website. Save my name, email, and website in this browser for the next time I comment.

The Canadian application launches on April To access the site, […]. Enter a few keywords in the Search box of the Service Information SIclick the Search button, and all related results are shown. GM models feature a variety of technology and new systems that may be unfamiliar to technicians and service consultants in GM dealerships.

Following are several videos highlighting new features to […]. Proper Coolant Level on the 6. Refer to Bulletin NA for additional information. Leave a Reply Cancel Your email address will not be published. Leave this field empty. Generic selectors. Exact matches only.

Search in title. Search in content. Search in excerpt. Search in posts.I have this Duramax that I have no heat at idle in the cab and the engine temp gauge drops to cold after you run it down the road and had it at operating temp.

I've installed a clear hose in place of the heater hose to check for flow and idling there is no flow at all. I have a Tee with a valve on it to bleed out air and I can bleed all the air out of the hose so it is full of coolant but there is no movement of the coolant and soon the hose fills up with air again. I have a pressure tester in place of the Rad cap and the system was running around 12 psi. I've bleed the air out a dozen times to have the hose completely full of coolant but it doesn't take long and the coolant is gone.

When you speed the engine up to RPM it take a little but soon you see a the coolant gushing through the hose but it looks like it is well mixed with air bubbles and while revving the engine the temp gauge comes back up, let off to go to idle and eventually the temp is down close to the cold mark and heater hose is all full of air. This truck has been losing coolant and spewing coolant out for the customer but has always run fine but he keeps coming back with this low coolant and spewing out problem.

I've checked over the system and can't find any leaks but I'm wonder if the water pump is bad. But were is all this air coming from? Good afternoon Corey, Sounds like you've done a fair bit but I do have some questions. How are you going about bleeding the air? There's an air bleed on top of the thermostat housing but I find the best way to fill these is with an airlift tool.

Does the pressure ever spike on the gauge when you have the tester hooked up to the expansion tank? I assume the coolant is spewing out of the…. Yes I have bleed it out at the thermostat housing and not sure if I've mentioned it I even replaced both thermostats also. I also pressurized the system some and opened my valve in my clear hose to bleed the air out there and then let all the pressure out before starting the engine.

I never saw a spike in the pressure gauge and yes it would spew out the expansion tank for the customer. No I…. I agree about the block tester. There is a different fluid for diesels but even still. It's one of those things that if it says it's bad it's bad but if it says it's good it could still be bad.

Kind of like an ohmmeter. Your best bet would be a five gas analyzer if you have one or can borrow one. Checking the impeller on the water pump would be labor-intensive as those are gear driven and a long…. I decided to see if I can scare up a gas analyzer around this town to use before I dig into the water pump and thanks for the info on that.

I figured it wasn't going to be easy from what I was seeing and I haven't done a lot of work on these engines other than fuel injectors and EGR so I'm not so knowledgeable on these engines. I have a handful of customers with these engines so I don't see them…. No problem at all sir.Forums New posts Search forums.

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2004 chevrolet duramax coolant resevoir reading low coolant level

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Post your own topics and reply to existing threads to help others out! NO ADS! The site is fully functional and ad free! Problems registering? Click here to contact us! JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. Thread starter vegtech Start date Sep 14, Just got the truck a few weeks ago. Got a low coolant warning and opened the hood to check. Is this normal? The left side of the coolant bottle is empty but the right side is full I started to fill it, it is painstakingly slow getting the left side to fill.

Never seen that before. Will L. Well-Known Member. That's not right. Well, the right is right but the left is wrong.

duramax low coolant warning

Messages 15, Reaction score 8, Location alaska. I don't have that style. My 97 is on firewall. I'll assume it has some baffle inside or some type of screen at the bottom of the fill opening that is suppose to limit the blow out of hot coolant if you open it under pressure.

Duramax Coolant Drain And Fill

It probably has an air hole at the top of chamber to allow fluid to push into the other side and air to escape. Something along those lines. I think if you take it off, empty the reservoir, and clean out the fill chamber you'll see some crust or gum build up stopping an air vent hole or something.

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Rear Axle.Do you often get confused as to what that low coolant warning sign fluctuations indicate? For starters, there may be several reasons associated with it. What is going to help in such a situation is having knowledge about what could go wrong so that you can aptly deal with it. So for your convenience, we have listed out a few reasons that could be the reason behind such signal variations.

Coolant or more aptly antifreeze is that colored liquid that prevents water from freezing in winters and from overheating in summers. But when the low coolant sensor turns on and off no matter what the season is, you may have several questions in mind.

The first step towards addressing the issue starts with inspecting the coolant levels. If that is not the case, then the following reasons could help you know better. A malfunctioned coolant sensor may lead to a diminution in fuel efficiency or it may even lead to improper emission readings.

Coolant Drain and Fill 2014 - 2018 Chevy Silverado or GMC Sierra

The reason behind such defective sensor would be a probable loose connection. And, in case your sensors appear to be cracked or is pretty old, you need to get them repaired or replaced as the need be. If you have a leaky radiator cap, the coolant gets eliminated from the overflow tube when the coolant expands due to car heat-up.

On the other hand, a gasket leak may lead to exemption of coolant from the system but you may not notice it as this is a slow leak process. However, the third reason for a leaky coolant could be a physical puncture in the radiator, which is easiest to diagnose. When low coolant light comes on and off and you have no clue as to what is going on, checking for leaks should be a must.

When you park your cars in cold or freezing temperatures, the coolant fluid tends to contract.

duramax low coolant warning

This tightening of coolant leads to lighting up of low coolant sensors. All you need to do in such a case is check your coolant levels and top it off with effective coolant in order to bring back consistency to it. You could either top it off by yourself or let your mechanic do the job for you.

Browse across maintenance tips to find out which top it off is best for your car. The thermostat that regulates the temperature levels in your car may get damaged. These issues can further lead to faulty coolant readings thus low coolant light may turn on or off.About a month ago my duramax started losing coolant, check radiator, water pump area and all hoses I also checked for traces of coolant in the oil.

I am running out of ideas. Any help or advice will be greatly appreciated! Thanks in advance! Ryan answered 8 years ago. Andrew answered 7 years ago. Jeremy answered 7 years ago.

This model year is notorious with coolant leaks. Its the heads of your truck.

duramax low coolant warning

If it has a blown gasket, it will leak coolant. Just read it in Diesel Power Magazine last month. They did an article about it.

I haven't noticed any white smoke. I have a diagnostic reader and nothing comes up. My Chevy HD won't start.

Engine won't turn over with key at all. Batteries are hot. You can take a power probe and shoot 12v to starter solenoid wire and it will crank and run fine. Every days my low coolant light comes on and there's not a visible coolant leak although you can smell it after its ran for awhile probably burning off.

All pressure gauges in the truck have read I have a different car. 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.Forums New posts Search forums. What's new New posts New profile posts Latest activity. Members Current visitors New profile posts Search profile posts. Log in Register.

Search titles only. Search Advanced search…. New posts. Search forums. Log in. For a better experience, please enable JavaScript in your browser before proceeding. Thread starter Wayne Start date Apr 9, Wayne Administrator Staff member.

Does anyone have this issue with their Duramax? When starting cold, the low coolant light comes on almost every time. The reservoir is on the full line and I've never added a drop on 26, miles. I'm not sure with the newer Dmax engines, Wayne, but the older ones used to have TWO thermostats and they were prone to air pockets if not properly bled for air upon filling.

2005 Duramax losing coolant... no apparent reasons...

I know that you have a much newer truck than my old Dmax, and I'm not nearly as familiar with the new engines as the older model Dmax engines. But it might be worth a try looking around to see if there's a bleed port somewhere high up in the coolant loop or t-stat housing.

There are several videos on this very topic on YT; probably can find out more there. Not unheard of at a cold start; apparently you're not alone. I looked at my old diesel Dmax website I used to frequent; there are a lot of complaints about false low coolant warning for the L5P.

The sensor is in the recovery tank and apparently has been known to be bad from the get-go. I'd first try filling it a bit above the line. If that does not stop the error light, then it's a trip to the dealer. Last edited: May 7, The truck needs to go in for an emissions recall, so I'm going to ask them to check the cooling system and I'll report back what they find.


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