Check out this DIY Thermostat Fix
kickin_it unleashes a beautiful writeup DIY with photos of how to change thermostat on Volvo XC90 T6 SUVs.
Volvo XC90 T6 DIY Thermostat & Water Pump Fix Procedure
kickin_it » I recently had the pleasure working on a 2004 XC90 T6. The issue at hand was a bad water pump so I replaced everything I took off: timing belt, accessory belt, tensioner, pulley, water pump, thermostat, and the dreaded nipple on the thermostat. I browsed this and other Volvo forums and found some great ideas for the housing fix just no step-by-step with part numbers. I decided to take notes and pictures throughout my repair which turned out pretty damn good I must say.
- 2 – LFA712 Elbow
- 1 – LFA776 Adapter(Bushing)
- 1 – LFA716 Pipe
- 1 – LFA298 Hose Barb
- 1 – Roll of thread tape or wrap
- Clamp or Vise
- 11/32” Drill bit
- 1/8” pipe tap
I started by removing the cover of the housing, I suppose you could just remove the housing as a whole. The cover is held on by 3 – 10mm bolts.
T-Stat cover and gasket removed with bolts.
I chose to remove the sensor from the housing, others may choose to remove the housing with sensor in place. I broke the nut loose with a 3/4 inch but it may be a 19mm either should suffice, break loose and spin with fingers.
I then removed the housing from the motor by removing the 4 – T40 bolts. I used T40 socket and ratchet.
Housing removed with sensor removed and bolts.
Motor with thermostat and housing removed with sensor still attached.
Here are the parts I picked up from the blue big box store, I went to the orange but no wanted to help. I would rather use Kobalt tools than Husky anyways.
I am not sure of the size of the drill bit but I first drilled out the broken plastic nipple. I then used the 11/32″ to drill a larger hole where the nipple used to be. I then used the 1/8″ pipe tap to thread the new hole. This was the trickiest part and probably the most important. My tap was not tapered so I actually used a 3/8 bit to widen the mouth of the hole about 1/8 of an inch deep to allow the tap to sit in the hole before tapping. I C-clamped the housing to the table and started twisting tap using crescent wrench.
I then attached the pipe and one of the elbows. I used thread tape/wrap on every thread. I then attached the elbow and pipe to the housing and tightened. Make sure to pay attention to the direction of the pipe, you want the hole for the sensor to the lower left hand side and the pipe pointing at you. I replaced the thermostat with new o-ring and a new gasket between the cover and housing. I decided to install as one unit. I reattached the sensor and tightened it down.
T-Stat installed with sensor and new fittings attached. Note: there is a plastic piece on the back timing cover that will need to be modified. The easiest and best looking would be to use a dremmel or something similar. I did not have one on hand and opted for some pliers and just “snapped” the plastic. This is required or the housing will not sit flush.
Next step is to attach the timing cover. The new brass pipe will fit into the existing hole without any modifications. Prepare the rest of the fittings by placing the adapter and the barb together, again using thread wrap. You must first attach JUST the elbow to the pipe sticking through the cover, tighten it with the elbow pointing upward THEN attach the adapter/barb to the elbow.
Here is a shot after just the elbow was installed and tightened. Note that the elbow is pointing upward in the direction the hose needs to run.
A shot after the adapter/barb attached to the elbow and everything is tightened down w/o hose attached.
I used the trusty screw clamps and used the existing hose without cutting or modifying the hose in any way to the expansion tank and to the nipple we just installed.
And you are done! I hope you enjoyed the tutorial and I was able to save you some money. All in all I spent less than $20 on parts and I already had tools needed on hand. Any questions or comments please leave below, thanks guys.
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