1991 Chev Blazer Leaking - Heating & Cooling System

Question: Heater core is bad or hose broken. Anti freeze gushing out under dash How do you remove heater core cover after removing all screws holding it on. Can't get cover off of core due to dash in way. I removed one bolt under right side of dash. Dash will not pull back enough to remove cover Still cannot get cover off due to dash in way. Have tried to remove dash before with no success.

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Technican: Hello, What size Blazer is this? C/K5? The whole case has to come out from under the dash to replace the core. Have you unbolted the entire plenum case? There are bolts holding the case that are located on both sides of the firewall. The dash does not need to come out or be pulled back. Please advise.

Owner: I have an S10 1991 Blazer. 4.3 Engine Four wheel drive. Haynes manual says to remove mounting bolts from modular duct from under dash and remove duct. Then remove core mounting screws and remove core. Having trouble removing duct. Dash and computer in the way I have replaced computer before so I know how to do that. Almost have duct out.

Technican: Okay, I'll regroup, get some perspective research done and get back to you. I'm going to see what the Mitchell 1 Auto Repair Data base has to say.

Owner: Have access to heater core. Removed mounting screws and hoses but core isn't comeing out. It's loose but it won't come out. Still trying to figure out what is stopping removal. Any sugestions?

Technican: Do you have the replacement core to compare how the tubes are shaped and their length? It may help to know which way to "tilt and pull" on the core to facilitate core removal. Are the tubes made into the core, or do they bolt on with a bracket to remain in position and seal? Back soon,

Owner: Have core out . Yep, it's bad. Now have to get new core (cost 20 bucks at parts store) and try to put it all back togeather. How do I get all the anti feeze out of the carpot? Is there any chemicals to use that would help with removal and how can I get anti freeze out of duct work. It's going to be hell of a clean up job.

Technican: "Wet vac the carpet, then shampoo it. If the coolant saturation is so bad the padding on the backside of the carpet is also soaked you may have to remove the seats as needed to take the carpet out (or pull it up/back) and replace only the jute padding. (Faster than cleaning, avoids smelly mildue) Running the heater and defroster will dry the duct work. Perhaps you could direct compressed air down the defroster ducts from the top down to move coolant to the lower part of the plenum. I don't recommend chemicals beyond shampoo for the carpet (none for the ducts). Consider an air freshner post clean-up efforts as the ducts and carpet dry."

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1991 Chev Blazer Leaking - Heating & Cooling System

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