Have you checked the thermostat isn't sticking?i had one once that the spring retainer on one side had broken,so basically the stat was always half closed.
Gary
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V70 P2 facelift T5 2.4 6sp manual SE Silver pearl (2005) 210k stage 2 315bhp
V70 P2 facelift D5 6sp manual E4 Sport SE Ocean Race Blue pearl (2005) 97k, standard.
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