Vehicle & Technical > Discovery
V8 Viscous Fan
doda456:
If you supect the rad, It cant hurt to remove it and wash it, inside and outside you will be amazed what comes out.
Just be carefull if you use a pressure washer, as it can bend fins if you get to close,
Also have you taken the front grille and cowling off at the same time, and tried to look through? You should see lots of daylight through the mesh. If theres no mesh you may have found a problem
Dan
SteveGoodz:
--- Quote from: doda456 on May 23, 2009, 18:00:15 ---If you supect the rad, It cant hurt to remove it and wash it, inside and outside you will be amazed what comes out.
Just be carefull if you use a pressure washer, as it can bend fins if you get to close,
--- End quote ---
That may be a job for tomorrow, or Monday
--- Quote ---Also have you taken the front grille and cowling off at the same time, and tried to look through? You should see lots of daylight through the mesh. If theres no mesh you may have found a problem
Dan
--- End quote ---
I haven't taken the grill off yet but looking through it it's hard to see cos the aircon rad and fans are in the way. Still, if I'm taking the rad out for a clean it won't matter :-)
J.D.:
Get hold of some central heating cleaner, most plumbing places will sell it, stick it in the coolant system and take the car for a spin. I did this on a few vehicles and it is amazing the amount of rubbish it pulls out of the system.
Note though - make sure you get one which isn't too corrosive or which doesn't agree with aluminium.
SteveGoodz:
--- Quote from: J.D. on May 24, 2009, 20:59:47 ---Get hold of some central heating cleaner, most plumbing places will sell it, stick it in the coolant system and take the car for a spin. I did this on a few vehicles and it is amazing the amount of rubbish it pulls out of the system.
Note though - make sure you get one which isn't too corrosive or which doesn't agree with aluminium.
--- End quote ---
Good idea, JD. One of my neighbours suggested it too but Fernox (and similar ch flushes) are fairly corrosive and have to be neutralised afterwards. I've bought some Wynns rad flush so I'll give that a try first.
SteveGoodz:
Okay, so I've ordered a new inlet manifold gasket and will fit that before I flush the radiator just to save on anti-freeze.
This afternoon I was bored with studying so I popped outside to check on the temperatures in the radiator using a K-type thermocouple plugged into my DMM. To make my life easier I removed the viscous fan and cowling and took the temperatures by inserting the thermocouple into the fins on the engine side of the rad. I took 10 measurements - 5 about 2" from the top and 5 about the same distance from the bottom. The temperature gauge started off pretty much on normal but, as you might expect, rose fairly quickly with no air flow through the rad. The measurements were:
Top (inlet side to outlet side): 70 - 75 - 78 - 71 - 66
Bottom (same orientantion) : 62 - 64 - 56 - 52 - 48
Difference : 08 - 11 - 22 - 19 - 18
So, I'm surprised that there is such a difference in the differences (if you see what I mean). Am I right in thinking the radiator consists of an upper and lower chamber (running the full width of the rad) connected by vertical water ways down which the hot water falls as it is cooled?
Your thoughts, please :-)
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