Originally Posted by
SierraSteve
yeah it has one I pulled it out to have a look and boiled it to make sure its opening and closing. wonder is it the matrix thats not working
find the matrix make sure its not been bypassed an old trick if it was leaking. some are right behind the dash. if the two pipes are conected still make sure the change over valve is operating this is the temp heater control its just a simple tap/valve type thing that stops the water circulating through the matrix