Change Heater & A/C Unit?
#1
Change Heater & A/C Unit?
I have torn apart the interior of my car, replaced all of the wood, added LED lights, new stereo & amplifier, realys, terminal blocks, refinished the interior of the glove box and now installing new heat shield, sound insulation and custom wool carpets. Every part of the water cooling system and A?C system will be brand new. Should I remove the items I have already installed to remove the heater-A/C box before it starts leaking? Please say no.
#2
Join Date: Mar 2008
Location: Pacific Northwest USA
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#3
#4
#5
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#6
#7
The heating nor the A/C unit is leaking. The weakest link in the water cooling and A/C system is the heater core the evaporator, everything else will be brand new. I am not sure how the A/C works if the evaporator is inside the heating unit. I just spent $5k replacing all of the HVAC equipment including the evaporator in the middle of the dash in our 2017 XC90 Volvo. How difficult is it to replace the heater core? Do they sell new smaller units? What is the manufacturer and part number? I attached a file with a picture. How do you show a picture on the post instead of a file?
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#8
Corrosion in the units isn't usually the issue providing the rules on coolant are followed - with the exception of the bars leaks the 'anti freeze' is mandatory then your challenge shouldn't be corrosion but sludge - that said the coolant helps with that too.
AEU1195 is part number for mine (which is an 87) I don't know if they're different, available new here in UK.
Use this icon to upload an image, I'm not sure about size constraints - 14+ MB is too much for an image I think
AEU1195 is part number for mine (which is an 87) I don't know if they're different, available new here in UK.
Use this icon to upload an image, I'm not sure about size constraints - 14+ MB is too much for an image I think
#9
My dad purchased this car new. I know he always took the car to the Jaguar dealership for repair and maintenance except for the last few years. I will try to have the heater core flushed in both directions and see what it looks like. Would there be any issues with the A/C parts? Is the condenser inside the cabin and has it been known to leak?
#10
Jaguar dealership does ring an alarm or two because standard practice on coolant changes is to throw some nastiness called 'bars leaks' or similar in the system and it clogs them up, don't know if that happened to yours though.
Only issue I know of with the XJS AC is the absence of R12 availability, there are other options but for efficiencies sake the expansion valve needs replacing, don't think I've ever encountered a failed evaporator in any car I've owned - plenty of condensers though.
Only issue I know of with the XJS AC is the absence of R12 availability, there are other options but for efficiencies sake the expansion valve needs replacing, don't think I've ever encountered a failed evaporator in any car I've owned - plenty of condensers though.
#11
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How difficult is it to replace the heater core?
Cheers
DD
PS-Evaporators seldom fail. Heater cores often do.
Last edited by Doug; 07-25-2024 at 07:39 PM.
#12
If you know what you are doing, the heater box can be removed. However, there is a very large risk in cracking or breaking the evaporator fittings during the removal process, and last time I checked evaporators were no longer available.
I've removed a number of AC boxes from various cars over the years, and I would only touch the evaporator in an XJS if I had already proven it was leaking and needed to be removed. No way would I touch a functioning unit, the risk of rendering it non-functional is too great.
I've removed a number of AC boxes from various cars over the years, and I would only touch the evaporator in an XJS if I had already proven it was leaking and needed to be removed. No way would I touch a functioning unit, the risk of rendering it non-functional is too great.
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Greg in France (Yesterday)
#13
I've removed a number of AC boxes from various cars over the years, and I would only touch the evaporator in an XJS if I had already proven it was leaking and needed to be removed. No way would I touch a functioning unit, the risk of rendering it non-functional is too great.
#14
I think that I would also add that the expansion valve will be tight - really tight, with the engine in situ it is an absolute bear to get any decent access to or purchase on. I replaced my expansion valve when the engine was out as part of an R134 conversion and it was still hard to do, the expansion valve has to come off if you want to remove the whole AC box which is not a job for the timid.
I wouldn't presume to lecture on a rule that I struggle with (not broken do not fix)
Yellow arrow is expansion valve location
Good luck getting at it !!!
I wouldn't presume to lecture on a rule that I struggle with (not broken do not fix)
Yellow arrow is expansion valve location
Good luck getting at it !!!
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Greg in France (Yesterday)
#15
The trick to removing an expansion valve is the right tool! Normal crows feet are terrible. However, Martin Brand crows feet are very thin and 12 point. Amazing what a difference this tool makes when replacing an expansion valve.
(you can buy a single piece, but the entire set is worth the $200)
https://a.co/d/0lhhUEZ
(you can buy a single piece, but the entire set is worth the $200)
https://a.co/d/0lhhUEZ
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BenKenobi (Today)
#16
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