coolant flow through the heater core?
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adenshillito (07-16-2021)
#24
Heater Flow comes from an outlet on the engine head water rail and returns to the bottom of the radiator on the V12. I am sure most engines work this way, so to see where the source of the hot water is on the engine, see where the feed to the water valve comes from. The outlet side from the valve will disappear into the heater unit through the firewall.
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adenshillito (07-05-2021)
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adenshillito (07-16-2021)
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If the water has gone through the radiator first, it loses so much of its heat as to be nearly Useless as a heat source on a cold night.
I can tell you how I learned that and what a mess it was to reverse the hoses - Again. But I was young and dumb at the time.
(';')
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Greg in France (04-16-2021)
#27
Bender Back In Place
Bender box in back in the car. Diagram provided explains most things, hot water in from the top rail via the heater valve thingee and down to the lower core pipe and then out via top core pipe back to the lower rail tap on the side of the engine. Are there any special no-return values that should be inserted at any point in the passage of the water?
so hot flows in at bottom and out at top
lower railer and under rail with taps for the heater.
so hot flows in at bottom and out at top
lower railer and under rail with taps for the heater.
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adenshillito (07-16-2021)
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Elinor:
With my usual respect.
1. I meant at the heater spigots. In and out reversed. matrix still gets water from te hot engine, not the cooler radiator.
2.I am contemplating your explanation. Agree. Water from the "cool" side f the radiator Is cooler. But, still plenty hot. How much cooler? Now at 200? Just short of boil at ambient pressure?
Please I do not want to open a controversy !!!!
With my usual respect.
1. I meant at the heater spigots. In and out reversed. matrix still gets water from te hot engine, not the cooler radiator.
2.I am contemplating your explanation. Agree. Water from the "cool" side f the radiator Is cooler. But, still plenty hot. How much cooler? Now at 200? Just short of boil at ambient pressure?
Please I do not want to open a controversy !!!!
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LnrB (07-18-2021)
#30
#31
The XJ arrived with lame wipers and Heaters.
make sure the Heater Tap is a Normally Closed, Opens with Vacuum tap. The oem tap is useless and appears to be restrictive, use one from a 1965 Ford Galaxy. Plastic, Made in China, cheap and works better.
if no cigar, then the heater matrix or "core" might be clogged. Time to back flush it.
Last, the blower motor is lazy. Replace with a more powerful motor so that High is really High.
#32
#33
redtriangle. finding and adapting a modern 12v fan motor can't be so difficult, or fitting the squirrel cage to the shaft. just go to a salvage yard with a bag of tools and start pulling fans out of cars and trucks, if they are accessible.
I did drive a Series 1 XJ once and I agree, the blower motor had no energy.
I did drive a Series 1 XJ once and I agree, the blower motor had no energy.
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