Fans will not come on during warm up or driving, coolant is bubbling and steam shooting out the reservoir

We need to start with testing for a head gasket failure. Based on everything you said, I am very confident that this is the issue.

Here is a guide that walks through how to do this:

https://www.2carpros.com/articles/head-gasket-blown-test

I went ahead and attached the process for the head if this proves out.

Let me know what questions you have. Thanks

There is no easy way to check for a cracked block other then tearing it down and look for it. However, the symptoms of this are overheating, smoking, oil and coolant mixing, and poor performance.

However, we need to do a head gasket test with the chemical shown in the picture. It will show a cracked block as well if it is allowing hydrocarbons in the coolant. This detail is at the bottom of this guide.

https://www.2carpros.com/articles/head-gasket-blown-test

Can you get a picture of how it is broken and I can confirm this? But I don't see a way that it would cause what you are seeing. However, seeing it will help me better understand if this is possible. Thanks

Yeah. That isn't good. That is oil and coolant mixing. Most likely you have had an overheat due to the fans not coming on and the head is warped which allows the oil and coolant to mix. Here is a guide that goes through this:

https://www.2carpros.com/articles/coolantantifreeze-in-the-engine-oil

Next step is to confirm this. You can do that with a compression test or pressurizing the cooling system and see if you hear air coming from the valve cover. A compression test is more definitive as it will also tell you which cylinders are the potential issue.

Here is a guide on how we need to do this as well:

https://www.2carpros.com/articles/how-to-test-engine-compression

Sorry this happened but unfortunately I suspect this is going to be a pretty tough repair. Let's start with checking compression and going from there. Thanks

Yes, the oil cooler could cause this as well but if your oil is completely mixed with coolant then you will have this same milky mess in the filter as well which doesn't necessarily mean the cooler is failed. If you are going to replace the cooler, I would just double check the cooling system holds pressure and run a compression check before you put to many miles on it. The only reason I say this is because of the heading you listed on this post which was it was steaming and bubbling the coolant due to the fans not coming on. The bubbling coolant is normally from excess pressure in the system which is normally compression gases due to a head gasket issue.

Thanks for the update. Please keep us posted and hopefully the cooler is it because that is a much easier and cheaper fix. Thanks

So putting all this together, someone started working on this vehicle and gave up and sold it. The fact that you found loose bolts and a broken bolt is all the proof we need for that.

As for fixing this, I suspect the low compression on cylinder 4 is causing the misfire codes.

The milky coolant/oil could be caused by the oil cooler but when you add all the other items in I suspect it is a head gasket issue. Namely the bubbling coolant. That is indicative of a head gasket issue because it is compression gases in the coolant. You have pretty much already confirmed this when you ran the compression check and found low compression on that cylinder. So at this point you need to do a cylinder leakage test to confirm the pressure is escaping through the cooling system. If that is the case, I think you found loose bolts because someone started to fix this but gave up and put it back together and sold it.

We may want to re-run the compression check and do a cylinder leakage test on any cylinder that is low.

https://www.2carpros.com/articles/how-to-test-engine-compression

Loose bolts on the valve cover most likely will not cause a misfire but low compression will and it appears you had low compression on 4 before so we will want to confirm this is still the case and then the leakage test will tell us where we are loosing the compression. Thanks for the update.