If you're turning on your heat and cold air is coming out, then this is what you can try. You have to get behind the glove box. Open the glove box, and just find all the screws that are holding the actual "box" part on door. Once this is out, you should be able to see a some wires and body paneling. Feel behind the lower left side of the glove box and try and find a lever which will move up and down. This lever switches your vents from the heating core to the A/C. Start up your car and put the heat on full blast. Then, while feeling the lever, push the "max A/C" button. If this lever doesn't try to move, there is your problem. Try using a rubber band to hold the lever in the heating position. You won't be able to use the A/C once the lever is bound, but when summer comes, just take off the rubber band.
You have to drop the steering column and pull the dash. Then after locating the heater core case below windshield you have to cut out a piece with a Dremel. After replacing the heater core you have fun putting everything back together..(use plastic weld to seal the case back up).in other words don't do it yourself it is a huge pain.
it is behind glove box and yes the dash must be pulled sorry. it is in the heater box betweenthe heater core and a/c evaporator book time is 11 hrs i know guys who complete the job in four but be prepped to replace heater core and maybe evap if signs of leaks are present and age heat box was revised because hinge pin would brake of blend flapper plastic door
On all chevys that year 1979-1988 It's Not Fun. Step 1. Remove heater hoses from core under hood. 2. Remove glove box door inside. 3. Take off all 5 heater mounting nuts under the hood. 4.Remove defroster hood on front of heater inside . 5 Gently pull heater unit back and down. 6. Remove all control cables from heater and mark them. 7. Then you can take heater core out of heater casing by removing 4 srews from case where core is. 8. remove front and back retainer straps from core. Reverse to put it back in.
Remove the glove box and the bottom part of the black plastic box that houses the heater core. Outside, you will need to remove the hoses from the heater core tubes that protrude through the firewall. Hard to do without a very expensive special tool. The best way, if you're sure the heater core is gone, is to cut the tubes just on the outside of the firewall or just inside whichever gives you best access. The hoses are connected to the heater with special clips which makes connection easy but disconnection almost impossible. When removing hoses make sure to mark the hoses (which goes on top) for proper replacement. be sure to use new plastic inserts available at the dealer. Use a little Vaseline or liquid soap to lubricate the rubber rings so as not to damage them and allow them to slip on easily. Cutting the heater tubes will save you a bundle in not buying the special tool.
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