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There are almost too many fans to choose from, and you'd want to avoid the 4pin PWM fans. 120mm is a common size, so it seemed like a good option. 38mm thick gives more airflow than the more common 25mm thick fans. I figured if the thicker fan seemed like too much airflow, I could scale down...

I turned the factory fan back around so it blows the hot air out of the case, and ended up adding a second fan on the rear of the case pulling cool air in. The fan I used is 120mm x 38mm and claims to be 118 CFM. I ran the compressor (with the cover on of course) 1.25 hrs and it stabilized...

I'm at about 4.5 hrs now, so it's within the range they say to first turn the grease pot knob. The sticker on top says to turn it 2 turns the first time, then one any time after that. I've verified that there is an air pocket like most have found, and it almost sounds like they know that based...

There's nothing wrong with the sensor. I've verified that it's activating at it's rated temp. The pump is just generating more heat than it's supposed to.

The pump seems like it has really good flow.

Reversing the fan didn't help enough to be worth the trouble. It might have gone 10 min more before hitting 150F, but it's clearly not a solution. It's going to need extra fans, so I'll think about what to try next.

As with the OP, GX never responded to the PayPal case, so the purchase was refunded. It looks like they do their best to convince you that overheating is OK, and if you don't accept that they don't fight it. Anyway, I guess I'm free to experiment now. Step one will be turning the fan...

I'm curious if you ever tried turning the fan around? Having the air pulled in from outside for the radiator would have to help water and compressor head temps, though the motor temps would suffer. The motor is already the hottest part but I'm not sure what the reasonable temp limit is for a...

Thanks, but if the CS4-I would work as advertised, it's perfect for me. I like that it's compact, quiet, and self contained. I'd ultimately mount my high pressure dryer on the side, and add an hour meter, plus maybe a temp gauge.

I typically top off large tanks (80 cu ft) from about 3400 to 4500, so I have to avoid the compressors that are intended for primarily filling guns. I would typically be doing 2-3 back to back. The 5 hr run time was one of the most appealing features of this little compressor.

The engineer in me really wants to do more testing on this, but I'm trying to resist until I get a resolution. I think you also mentioned that your 0-300 bar test with just the hose was around 24 sec like mine. The manual says something like 36 (clearly too lazy to look it up <g>). It would...

GX continues to insist that the compressor isn't defective and can't be returned, so PayPal case has been opened.

The CS4-I I got direct from GX ended up being about $125 cheaper than the Amazon price, but since it overheats in 30 min I may regret not having that Amazon return option. In general it seems they're good, but it's my luck to get a bad one. The refund request is still ongoing, so I'm not sure...

Water Wetter is just a surfactant that likely won't make much difference. A couple drops of dish soap probably would work as well. The head and water temps are very close, and the air coming out of the radiator fan is very hot, though I didn't measure it. That all pretty much verifies that...

I just sent them my final reply: "The compressor doesn’t work as advertised. It overheats in 30 min in an air conditioned basement. This is the definition of “defective”. I will not disable a temperature safety circuit, and I won’t return it for “repair” since you’ve already said you will just...

Here are their most recent replies that were in my email this morning. At this point I'm telling them I need to return it at their expense for a refund since I'm unwilling to disable a safety circuit on a unit that's clearly defective. I will also not let them "repair" it since they already...

I do think there's some difference in compressors from the factory. Some people document a max temp under 120F, and theirs can run for hours. Some like mine and the OP's unit overheat quickly. I would never consider tearing into a new unit since it's under warranty and should have been tested...

Tonight's results were worse than earlier. It ran about 40 min earlier today, but tonight it didn't even make it to 30 min. I logged the ambient, water, head, and motor temps. Starting pressure was 3000 and shut off was 3600 with a cutoff set at just over 4500. After the shut off, I turned...

After about an hour, when the water temp was around 100F, it restarted. I've already send an email, and I grabbed my better thermocouple gizmo to make more detailed measurements similar to what was done a handful of posts above.

I tried a longer run, 73F ambient, clean distilled water with good flow. I started at 3500 psi in the tank, and at about 35 min I slowly bled that down some to keep from hitting the cutoff at 4500. At 44 min, it shut off, and so far can't be restarted by any form of power cycling. I guess...