Coolant Temp Sensor
#2
It's under the third intake runner, screwed in the head with a plug on it naturally... It's hard to get to it with the intake manifold on but not impossible. Unplugging it the hardest, then usually with a long extension there is a straight shot onto it, forget the size, (19mm?)... Coolant loss is minor.
#4
#5
It absolutely can be caused by this sensor! This is the first thing I'd look at in case of hard cold starting, well, after battery...
#9
I just replaced mine in my 89 740 but I was also changing the PCV box and cleaning the throttle body. If you have the TB off it's pretty easy. I used a long 3/8" extension and a 7/8" deep socket. Was a pretty easy job and when I did it on a cold engine I didn't get much water come out. If you keep the cap on and no pressure on the system coolant just dribbles out.
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Sufarry
Volvo 240, 740 & 940
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07-27-2018 09:42 PM