Most cars have a switch to bypass flow to the heater when not needed and it is NOT on the heater core (geez) and I expected the fiero to have one too.
But... if you looked "everywhere", you would've seen the "switch" (if it existed). Not trying to give you a bad time, but you can't make any assumptions.
quote
Originally posted by randy86:
I have looked everywhere and cannot find a leak...
[This message has been edited by Patrick (edited 03-19-2020).]
theogre
MAR 19, 03:19 PM
quote
Originally posted by randy86:corrections Most cars have a switchvalve to bypass flow to the heater when not needed and it is NOT on the heater core (geez) and I expected the fiero to have one too.
Some cars have heater bypass valves. Fiero and Most vehicles Never had this. Some cars Need the heater core hot even to run AC w/o evaporator freezing etc.
Even with a bypass valve the bad heater core will still leak coolant because often the core is still under pressure. Very common a valve Diverting Flow is Not = core sees No Pressure. Making a bypass killing Pressure to the core when bad would cost more to make.
The only way to bypass on most vehicles w/ bad core is remove both hoses and use tube to connect the ends. Example: This keeps both ends same size as heater core. Solder blobs keeps hoses on even if clamps get a bit loose and to make just get less heat and flux to prevent flow. I made it 20+ years ago and posted before but can't find old img so just cleaned it for today pic to show easier.
Can use anything in a hurry but hose barbs etc have their own problems.
