Coming from the firewall to the engine.......does the hose connecting heater core to engine bay, is this a vent or does this hose route back to the engine or heater control valve? I cant find what or where connects to, please help leaking coolant and car overheating b/c dont know how this hose routes?
Heater Core Coolant Leak on 1992 Buick Roadmaster
by Visitor in Troutman, NC on March 31, 2010
ANSWER by Visitor on June 29, 2010
Sounds like the same problem I had on my 92 RM w/5.7. The heater hoses have a "click-lock" type connector to the heater core stubs coming through the firewall into the engine bay. On my car, the hose with a small plastic insert with an arrow indicating flow was leaking at this connection. This hose is called a "flow restrictor". (My local parts stores couldn't find it by looking for heater hoses.) My solution was to replace this entire hose assembly witha 3/4 inch heater hose. There is just enough stub on the heater core to use a worm clamp to secure the hose. It has worked for about 8 months. Car has heat in winter, and good AC in summer (100 degrees last week.)
Coolant is leaking up on passenger side floor board. I had heater core replaced about 2 years ago. Also, coolant is now leaking all over engine compartment.