Bought this thermostat about 3 weeks ago
We all know the numerous problems our cars accumulate over time and most of them come from the car running hot all the time. If your cooling system is still sealed your car should get no hotter than 103C degrees when driving in the city and 99-100C on the highway, If you start hitting numbers between 105-110 then your cooling system is already compromised. Your engine and transmission share the same cooling system so this is some serious ****.
Anyhow decided to install the thermostat this past Friday before taking a trip to Chicago. Did some testing and drove around the city before I left, I was at 92-93 degrees driving in the city, the highest it'll hit is 96 then it drops back down to around 90, so let's just say for city driving the temp is between 93-96C. Jumped on the highway later and man the car just felt happier, definitely had more power and I was picking up speed faster than usual. On my whole trip to Chicago which was 2hrs 30min the temp held steady at 92-93C and not once did it go above that. When I got to Chicago I did some heavy city driving, bumper to bumper traffic and the highest I'd hit was 96C degrees, bear in mind it was a hot day too about 85F. Checked temp too on my way back from Chicago and it held steady at 92-93C.
I know some of you are gonna say the company that makes those has bad reviews. Yes I googled them, Yes I read the reviews. What you guys are forgetting is all you really need is the inner parts of the thermostat, so for peace of mind I took out the inner parts of the 90C thermostat and put them inside my OEM stock housing, replaced O Ring No worries (See attached image)
So to answer anyones question yes the thermostat works and will save you a ton of expense and headaches down the line ONLY IF YOUR COOLING SYSTEM ISN'T ALREADY LEAKING, otherwise it's pointless installing it. The choice is yours but I think this is my best mod yet on this car, I'm loving it.
HOW I INSTALLED THE THERMOSTAT!!!!!
BEFORE WE BEGIN, BEAR IN MIND YOU'RE DOING ALL THIS AT YOUR OWN RISK JUST AS I DID!!!!!!
1.) First you wanna get access to the thermostat, if you don't know how watch this video.
- WHEN YOU NOW HAVE ACCESS TO THE THERMOSTAT DRAIN ALL THE COOLANT FROM THE RADIATOR BEFORE YOU REMOVE IT, I REPEAT DRAIN RADIATOR. The drain plug is at the bottom left corner of the radiator, you will have to jack up your car so you can get underneath it to remove the plastic shield under the car that protects engine bay, look it up in TIS if you're unsure
2.) AFTER RADIATOR IS DRAINED, proceed to remove Thermostat as shown in video, there's one 10mm bolt behind the thermostat that's gonna give you trouble as it's hard to reach but if you have extra big hands like I do, grab a 10mm wrench such as this
![Image]()
And reach from under the thermostat to remove the bolt, you'll have enough leverage space that way rather than attempting to unscrew it from the top.
3.) When you have removed the OEM thermostat, wipe it down and remove the O Ring (we're gonna replace it with a new O Ring) now we're gonna swap the element from the 90C thermostat and put it into the OEM thermostat housing
4.) The stock stat pops apart by compressing down the tab that slides across the top of the element spring and turning the unlatching part from the housing, do the same for the 90C thermostat. If you're unsure how to do this I HIGHLY ADVISE you find someone who does because you could hurt yourself or damage the thermostat. When you take out the element TAKE NOTE of location of the hole at the bottom of the element it should be on the same side where the sensor plug is but right above it, when you install the 90C element in the OEM housing it has to be in the same position.
After you have the 90C element installed in the OEM housing, remove the O Ring from the 90C housing and put it on the OEM housing, dip your finger in some coolant and put it around the ring.
5.) Re install your new hybrid thermostat and put the car back together as directed in the video that showed you how to remove it.
6.) I recommend you use OEM BMW coolant and mix it with Distilled water, it's a 50/50 mix, don't re use the coolant you drained.
Top up the coolant per these directions and IT'S VERY IMPORTANT THAT YOU VENT YOUR COOLING SYSTEM AFTER REFILLING COOLANT to prevent uneven warming up which might spike your temp higher than it needs to be because of air bubbles, our cars self vent but I still recommend manually venting.
Venting cooling system and checking for
leaks (N62, N62TU)
Warning!
Danger of scalding!
Open sealing cap only after engine has cooled down.
No vent plugs on radiator and thermostat housing.
Cooling system is vented while it is filled and during subsequent
idle operation.
Note:
Before filling, turn on ignition. Set blower to low level. Seat heating
controller to maximum temperature. This ensures that the heater
valves are fully opened and the auxiliary water pump starts up.
Important: The auxiliary water pump must deliver coolant in order
to ensure fully venting!
Installation:
Use only recommended coolant.
Check cooling system for leaks
Perform filling operation slowly.
Pour coolant into expansion tank (1) up to MAX mark.
Start engine and run at idle speed for approx. one minute (cap
open). Then adjust coolant level to MAX.
Close cap and run engine up to operating temperature until main
thermostat opens. Check cooling circuit and drain plug for leaks
And that's it, ENJOY your cooler running 7 series
We all know the numerous problems our cars accumulate over time and most of them come from the car running hot all the time. If your cooling system is still sealed your car should get no hotter than 103C degrees when driving in the city and 99-100C on the highway, If you start hitting numbers between 105-110 then your cooling system is already compromised. Your engine and transmission share the same cooling system so this is some serious ****.
Anyhow decided to install the thermostat this past Friday before taking a trip to Chicago. Did some testing and drove around the city before I left, I was at 92-93 degrees driving in the city, the highest it'll hit is 96 then it drops back down to around 90, so let's just say for city driving the temp is between 93-96C. Jumped on the highway later and man the car just felt happier, definitely had more power and I was picking up speed faster than usual. On my whole trip to Chicago which was 2hrs 30min the temp held steady at 92-93C and not once did it go above that. When I got to Chicago I did some heavy city driving, bumper to bumper traffic and the highest I'd hit was 96C degrees, bear in mind it was a hot day too about 85F. Checked temp too on my way back from Chicago and it held steady at 92-93C.
I know some of you are gonna say the company that makes those has bad reviews. Yes I googled them, Yes I read the reviews. What you guys are forgetting is all you really need is the inner parts of the thermostat, so for peace of mind I took out the inner parts of the 90C thermostat and put them inside my OEM stock housing, replaced O Ring No worries (See attached image)
So to answer anyones question yes the thermostat works and will save you a ton of expense and headaches down the line ONLY IF YOUR COOLING SYSTEM ISN'T ALREADY LEAKING, otherwise it's pointless installing it. The choice is yours but I think this is my best mod yet on this car, I'm loving it.
HOW I INSTALLED THE THERMOSTAT!!!!!
BEFORE WE BEGIN, BEAR IN MIND YOU'RE DOING ALL THIS AT YOUR OWN RISK JUST AS I DID!!!!!!
1.) First you wanna get access to the thermostat, if you don't know how watch this video.
2.) AFTER RADIATOR IS DRAINED, proceed to remove Thermostat as shown in video, there's one 10mm bolt behind the thermostat that's gonna give you trouble as it's hard to reach but if you have extra big hands like I do, grab a 10mm wrench such as this
And reach from under the thermostat to remove the bolt, you'll have enough leverage space that way rather than attempting to unscrew it from the top.
3.) When you have removed the OEM thermostat, wipe it down and remove the O Ring (we're gonna replace it with a new O Ring) now we're gonna swap the element from the 90C thermostat and put it into the OEM thermostat housing
4.) The stock stat pops apart by compressing down the tab that slides across the top of the element spring and turning the unlatching part from the housing, do the same for the 90C thermostat. If you're unsure how to do this I HIGHLY ADVISE you find someone who does because you could hurt yourself or damage the thermostat. When you take out the element TAKE NOTE of location of the hole at the bottom of the element it should be on the same side where the sensor plug is but right above it, when you install the 90C element in the OEM housing it has to be in the same position.
After you have the 90C element installed in the OEM housing, remove the O Ring from the 90C housing and put it on the OEM housing, dip your finger in some coolant and put it around the ring.
5.) Re install your new hybrid thermostat and put the car back together as directed in the video that showed you how to remove it.
6.) I recommend you use OEM BMW coolant and mix it with Distilled water, it's a 50/50 mix, don't re use the coolant you drained.
Top up the coolant per these directions and IT'S VERY IMPORTANT THAT YOU VENT YOUR COOLING SYSTEM AFTER REFILLING COOLANT to prevent uneven warming up which might spike your temp higher than it needs to be because of air bubbles, our cars self vent but I still recommend manually venting.
Venting cooling system and checking for
leaks (N62, N62TU)
Warning!
Danger of scalding!
Open sealing cap only after engine has cooled down.
No vent plugs on radiator and thermostat housing.
Cooling system is vented while it is filled and during subsequent
idle operation.
Note:
Before filling, turn on ignition. Set blower to low level. Seat heating
controller to maximum temperature. This ensures that the heater
valves are fully opened and the auxiliary water pump starts up.
Important: The auxiliary water pump must deliver coolant in order
to ensure fully venting!
Installation:
Use only recommended coolant.
Check cooling system for leaks
Perform filling operation slowly.
Pour coolant into expansion tank (1) up to MAX mark.
Start engine and run at idle speed for approx. one minute (cap
open). Then adjust coolant level to MAX.
Close cap and run engine up to operating temperature until main
thermostat opens. Check cooling circuit and drain plug for leaks
And that's it, ENJOY your cooler running 7 series
No worries
