Volvo C30 2007 Service And Repair Manual page 426

Place some paper below the pipe couplings to collect any spilled coolant.
Cut or saw off the pipes.
Press the pipes towards the firewall so that they protrude into the engine compartment.
HINT: To facilitate, also route the pipes from the engine compartment.
Fig. 56: Identifying Screws And Lead-In's Right Half
Courtesy of VOLVO CARS CORPORATION
Remove:
the 2 x screws and the lead-in's right half.
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the section that holds the heat exchanger and evaporator pipes apart.

Pull the heat exchanger pipes through the seal.
Seal the pipes to the heat exchanger so that the remaining coolant cannot run out.
Angle the heat exchanger up at the rear edge. Lift out the heat exchanger towards the passenger side.
NOTE: Note how the seal is located on the heat exchanger.
INSTALLATION
NOTE: Install a new seal carefully using the removed evaporator as a template.
Install:
the heat exchanger
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2012 Volvo C30 T-5
HVAC Climate Units - Removal, Replacement And Installation