Why is my trailblazer overheating

While there are a variety of reasons your Chevrolet Trailblazer is overheating , the most common 3 are a coolant leak water pump, radiator, hose etc. Jim Slieter Professional. How do I know when my water pump is bad? Here are some common symptoms that hint towards having a bad water pump:. Coolant leak at the front-center of your car.

Water pump pulley is loose and making whining sounds. Engine is overheating. Please guide me in this issue. How much is the normal rpm of radiator fan? Hope reply asap. Do you. When air conditioner is on the fan should lock and might not be, scan for codes as yours is a semi electric hookup and may not be doing that. If only overheating with air conditioner on he may be right and it is not working. Was this answer. Thanks for the reply So now as you told I need scan for error codes.

If there is error I need to replace fan clutch? There is no debris in front of condenser. If fan clutch is bad it will it show in computer scan? If the fan clutch is weak or bad, it will not increase the fan speed as under hood temperatures increase. Thus, it will overheat. Since everything else has been replaced, that would be what I suspect is bad. I have, however, seen situations where the lower radiator would collapse under certain conditions. Therefore, when the engine begins to get hot, check both the lower and upper hoses.

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Long time lurker, first time poster here. This site is great! I have found other similar threads to this but they have either gone unsolved, or they were fixed by something I have already tried. I'm looking for help on where to go from here. Here is the story: This spring, I replaced the water pump on my 04' Trailblazer 4.

Part Gates I also "flushed" the radiator with a DIY fluid from Prestone. A couple of months later I had the first overheat while pulling my boat on a hot summer day on the highway. Coolant was bubbling in the reservoir. I had the car towed home and I replaced the thermostat. Part AC Delco The new and old thermostat were tested with boiling water and both seemed to operate properly, which made me think that was not my actual problem.

I also replaced the radiator cap, but did not use AC Delco brand. I lived with the problem until about a month ago when the truck overheated badly and unexpectedly on a long highway drive at 70mph not towing anything on an 85 degree day. Engine had to be shut off to prevent damage and towed home again. Coolant had been pushed out of the radiator and into the reservoir, creating loud bubbling sounds again after the engine was shut off.

I filled up the radiator again and drove it a few days short distances without a problem. Then the vehicle started overheating slightly almost every day driving around the city. I am still having the same problem. If I fill up the radiator while the engine is cold, the car will not overheat for days until it has time for the coolant to be pushed out of the radiator into the reservoir.

Here are some of the reasons that your coolant may run low:. There are a lot of places to look for a radiator leak. In fact, you really should not need to take it off at all, unless the coolant is leaking from the cap itself.

A slow leak can be more difficult to find than a quick leak, since the coolant can evaporate before it has a chance to show itself. It really does work well. Do you have a lot of white smoke? When the cooling system itself is bad, usually the opposite will happen. One of the most common reasons that a vehicle overheats is a bad thermostat.

If your radiator overflow is full and you radiator fan is kicking on , it is very likely that a bad thermostat or bad water pump are causing your Trailblazer to overheat. Of these two, the thermostat fails more often than the water pump.