sarahmiller32
Volvo XC70 Coolant Loss
Summary of the thread
A 2002 Volvo XC70 was experiencing persistent low coolant levels and a check engine light with an error code related to coolant. Despite no visible external leaks, potential causes considered included a faulty radiator cap, issues with the coolant reservoir, radiator hoses, or a head gasket problem. After conducting a pressure test, it was determined that the radiator cap was slightly leaking. Replacing the cap resolved the issue.
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4 comment(s)
sarahmiller32 (community.author)
I haven't pressure tested it yet, but I know how. Coolant was replaced 3 years ago, using the correct Volvo-spec coolant. Could air pockets be trapped in the system, causing the low level reading?
jannikdunkel1
Air pockets are possible, especially after a coolant change. Sometimes, they can be hard to bleed out. But persistent low coolant usually means a leak, internal or external. Given the age, I'd suggest a thorough inspection. If you're not comfortable doing a full diagnostic, a workshop is the best bet.
sarahmiller32 (community.author)
Thanks for the insight. I pressure tested the system and it was a slightly leaking radiator cap. Replaced it for 52€ and the problem is solved.
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VOLVO
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XC70
jannikdunkel1
Low coolant is never good. Since you're not seeing external leaks, a cooling system pressure test would be a good first step. That will show any small leaks in the radiator, hoses, or even the water pump. Has the system ever been flushed, and what coolant type are you using?