Heater Not Working

[deepcove]

Hey guys,

I have a 2004 LS with 750 hrs. Today my heater stopped working, the blower fan still works in both low and high settings but the air coming thru is not hot. I did a search and found all problems that others have had with thier heaters involves a leak and replacement core. The difference with mine is I do not have a leak. Would this still be a core replacement issue?

[DOCDRS]

Have you ever changed your thermostat? Did your engine temp register 160? There may be a blockage in your core remove the hoses and see if they are patent. If your not over heating then i would think you have a blockage thats preventing water from circulating thru it imo

[deepcove]

I have never changed my thermostat, my guage was reading the usual temp, just over 160. It is interesting when I was out yesterday some one had one of the hoses and said it was not very hot, then got hot.....maybe some sort of blockage is possible?

Also I run a closed loop cooling system, not sure if this changes things.

[DOCDRS]

where are you located, disconnect the hoses and see if you can easily blow thru one, is it oem heater?

[deepcove]

I am in Vancouver. It is the heater that came with the boat from the factory, I will try to remove the hoses tomorrow.

[DOCDRS]

were you idling at the time? in cold water,idling , the heater may do that. Will heat up again when under way

[deepcove]

I was not idling...