Very weird problem with my envy cooling system

[Benjaminweir]

Hello my Envy has been getting really hot during use and I was wondering why. The temps were getting up to 88 Celsius and being a IT person made me worry why it was getting so hot. The first thing I did was replace its thermal paste but in doing that I noticed something very odd. There was a 2nd cooling vent that was blocked on purpose with a piece of plastic held by a screw. Immediately i removed it and the plastic piece and it stayed a bit cooler. It made me think why it was there so i went into the service manual and when looking I saw something. There is 2 different heatsinks this model could have come with one heatsink part number 630790-00 for 35w cpus and 630791-00 for 45w cpus. For some reason mine had the 35w cooler on my 45w i7 cpu. I went online and bought the 45w heatsink and it helps but it still gets hot but when looking at the service manual I saw that the base pictured had extra cooling vents mine did not have. I looked up the base enclosure part number and after a TON of searching I found out there were 2 different bases as well but I cant for the life of me find the base with the extra cooling for sale anywhere. What should I do I have no idea where to acquire the correct base for my unit and I don't want it to get to hot it damages itself. Any advice is welcome 🙂

The extra cooing vents and bigger intakewhat mine looks like see how its blocked and the intake is smallerthe heatsink i boughtwhat my heatsink was before

[Huffer]

This is the Manual HP has posted for your model series but seems to only cover 17t-20xx and not -21xx models. 

Manual

I only see one base. This was not a high volume model we rarely get questions about it and I think replacement parts will be hard to find. You might want to consider looking at some youtube videos on cooling hacks for laptops. Some copper shim material between the processor core and heatsink and then some strategic dremel tool work on the base enclosure can help a lot. And costs very little to do as you seem to have no problem with disassembly. 

[Benjaminweir]

Thank you for your reply! Yeah that is what is hard because in the manual it only had one base but it seems that depending on the cpu that was configured for it hp would open that vent up and use that other heatsink. I understand what you said to because looking it up nothing really comes up so like you stated it seems like since this laptop was so expensive when it came out it didn't sell much. So for advice do you think a dremel could help? Do you think I should drill out the vents like the picture maybe to help?

[Huffer · Accepted solution]

That is exactly what I am saying (dremel out some vent holes strategically placed) and then look into adding some thin copper sheet between the processor and heatsink. This is a well known hack and if you search youtube you can get some pointers.