So a few weeks ago my radiator developed a pinhole leak. I poured a bottle of copper sealant and it did its job, but also blocked the lines going to the heater core as well. It would blow lukewarm air but now its just blowing ice cold. I work as delivery from 10pm-4am and the past week its been well below freezing and it sucks. I do not have the time or tools to pull the whole dash off to get to the heater core, so I'm trying to save that as a last resort. Suggestions?

 

You might try a chemical flush of the cooling system and see if that helps.

 

Not sure but I think that the heater hose from the engine to the the heater has a flow restrictor to prevent over pressure at the heater core. You might try pulling the hoses and back flush them. Someone here should be able to back me up
or call b/s.
Good luck

 

With the engine at operating temp feel the heater hoses. Are they both warm? Hot? Cold?

.

 

Might wanna get a disconnect tool from these folks before pulling heater hoses from the heater core

http://www.toughnutz.com/heater_hose.mgi