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Need help. Has anybody replaced a high pressure heater/coolant hose for 03 trailblazer 4.2
 

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2004 chevy trailblazer_lt
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I don't exactly know which hose is a high pressure heater/coolant hose on a TrailBlazer. It's not like with an AC system where there is a high pressure liquid line and a low pressure gaseous line.

Are you interested in the heater hose line that goes behind the engine block and then over to the heater core?
 
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