When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
i have to agree with velocity, if you look at the bulk head practaly opposite the oil filter theres two hoses that go into and out of the heater matrix, try and stick a hose through them and flush any gunk out, but if its not flowing around it then i'm afraid its a dash out jobbie to replace the matrix