millsy
4x4 Earth Contributer
Puzzle #1;
About 9 months ago I noticed the temp gauge needle changed from sitting near the middle of the to much lower down the scale - on the first, and only, mark up from cold. On my MQ that's just about 1/8 around the dial. I had put a new bottom radiator hose in around that time.
I was wondering if the new radiator hose and the change in the gauge was just a concidence. Or maybe the old hose was thin enopugh to be collapsing under the suction of the water pump.
But I also noticed that even after a good drive you could hold the bottom hose quiet firmly with no fear of burning your hands. It was just luke warm. It is a heavy duty, 2 year old radiator, and a small motor ( 2.8L ).
I put a new thermostat in, but it made no difference. So do those temp sensors in the thermostat housing finally go off with old age, and as a result give a low reading? Or is there any other explanation?
Puzzle#2
An interesting observation, that I cannot recall seeing on any of my other cars, is that this old Patrol seems to know when the sun is setting. Even on a hot day the temp needle drops to the left by about 3mm on the scale, just as the light fades at the end of the day. This even happens on a warm day, but when I drive off in the coolest part of the day, early the next morning, after sunrise, there is the gauge sitting in its normal day position! Does anyone else also have a car that seems to be light sensitive? Its got me stumped!
Its up to its old tricks again, now that I have put it back on the road. But its a bit of a worry to see the gauge read nearly zero after sunset. I think its dropping back a bit more than it used to!
About 9 months ago I noticed the temp gauge needle changed from sitting near the middle of the to much lower down the scale - on the first, and only, mark up from cold. On my MQ that's just about 1/8 around the dial. I had put a new bottom radiator hose in around that time.
I was wondering if the new radiator hose and the change in the gauge was just a concidence. Or maybe the old hose was thin enopugh to be collapsing under the suction of the water pump.
But I also noticed that even after a good drive you could hold the bottom hose quiet firmly with no fear of burning your hands. It was just luke warm. It is a heavy duty, 2 year old radiator, and a small motor ( 2.8L ).
I put a new thermostat in, but it made no difference. So do those temp sensors in the thermostat housing finally go off with old age, and as a result give a low reading? Or is there any other explanation?
Puzzle#2
An interesting observation, that I cannot recall seeing on any of my other cars, is that this old Patrol seems to know when the sun is setting. Even on a hot day the temp needle drops to the left by about 3mm on the scale, just as the light fades at the end of the day. This even happens on a warm day, but when I drive off in the coolest part of the day, early the next morning, after sunrise, there is the gauge sitting in its normal day position! Does anyone else also have a car that seems to be light sensitive? Its got me stumped!
Its up to its old tricks again, now that I have put it back on the road. But its a bit of a worry to see the gauge read nearly zero after sunset. I think its dropping back a bit more than it used to!
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