[wouter]

Originally Posted by LMP

The one near the steering column is the rear heater relay
the one near the glove box is the low speed relay

THe High SPeed Relay in located on the firewall, on hte engine side

www.avigex.ca/xport/heaterrelay.jpg
www.avigex.ca/xport/hvac_diagram_front.jpg

Thank You!
I've replaced the relay on the firewall: problem solved!!
(Yesterday i've removed lots of parts from the dashboard, finding the mentioned relays. Thanks again!)