It certainly sounds that way - the fact it happened after you'd been doing the heater hose is too much of a coincidence to be ignored.
Can you get some underbonnet pics at all? It's possible someone on here may be able to spot something that saves you an expensive bill
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Cheers
Dave
Next Door to Top-Gun with a Honda CR-V & S Type Jag  Volvo gone but not forgotten........
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