Are you saying the heater core is leaking? Is it coolant or condensation from the A/C (there is a drain for this)? I find it strange that multiple heater cores are leaking. I would have to say it is the hose, or the installation (bent, stressed, punctured) of the core.
I also replaced my heater core within the last year and it's leaking, too. It was a Spectra Premium from NAPA. The cores I was presented from Advance were all too short. The manufacturer's customer service told me to fill the space with insulating foam to hold it in place.
Jack, catch the drip in a cup, feed it to the neighbor's cat. If it survives, it was just condensate.
Lol...... I have 4 cats.....they mean as much as the Fiero to me. Back to the antifreeze leak....... I would be looking at my inlet hoses....and tubes. Ck for a loose loose clamp....and making sure that something wasn't damaged when installing. Also check the hvac box drain. I'd should leak on floor unless pluged......thus why there is a drain. It's same as the a/c drain..I have installed many of the spectre heater cores. Never had a issue with one or fitment problem. I believe Oreily auto parts has a brass core available. Might check into that Best of luck with Brian
[This message has been edited by bkw88 (edited 10-08-2015).]
This is the 4th core I have replaced and it is leaking at the header. No leak around the tubes. Before replacing the core one of the water tubes under was leaking due to a hole just under the front heater hose. After replacing the tubes found the core leaking. All this brought my attention as to what is happening to the heater. So got the core replaced today and hopfully all is fixed.
Everything I found was just a little shorter than the Harrison that came out.
Yeah, the replacement heater core I put in my Formula two years ago was a little smaller than the core that came out. It therefore didn't seal along the edges all that well, but I hoped that a bit of air getting past the core unheated wasn't really going to affect the overall warming effect. It didn't, and I'm satisfied with it.
Originally posted by spirit:
This is the 4th core I have replaced...
With all your heater cores that have leaked, are you running straight water as a coolant, or are you using the proper 50/50 mix of anti-freeze and water?
Coolant is 50/50 but none of the tablets recommended for a Caddy engine. That has been fixed. GM wanted about $190 for core. Fiero Store asked about $100 and Auto Zone was $46 with life time warrenty. I have tried all 3 and the boxes they came in were all the same with the same markings. Go figure. I have installed the last 3 and have had the same results with the pro-installed. Hopefully this will be the last. By the way my cat (Zig) don't like antifreeze.