Monday, April 06, 2009 - 01:01 pm, by: Ken Brahniuk(Ken_b)
I have been hearing a steady on and off hissing noise in the firewall area ( engine side ) on the passenger side of my JZZ30 TT only when I lower the temp below about 25 C on the climate control, It occurs with or without the AC on. Everything else seems to work ok with blowing heat and cold air. Just wondering if anyone has experienced this issue and any ideas on corrective measures.