Question about 1991 GMC Sierra
I have a 3500 5.7 motor is there any thing I need to know if I am doing it my self is it ok to by pass the core how long can I drive the truck if I did that
It is ok to by pass the heater core but you will get no cabin heat in cold weather. find the 2 hoses that go into the heater core and join them together. Remember to check the coolant level at the radiator cap as you may get an air lock in the system
Posted on Nov 09, 2014
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Posted on Jan 02, 2017
SOURCE: Heater core
I just changed my 1996 jimmy heater core. Its not that bad. It took about six hours.
Remove all panels below the dash. There are three nuts to remove under the dash, One in the center and one on each side at the side panels. I did not remove the park brake, I just let that panel hang loose. Remove the two nuts holding the steering wheel bracket top allow the steering wheel to rest on the seat. Remove the speaker covers on the top of the dash and remove the defroster grill. You'll see four screws on the top of the dash. When you remove them, the dash will start coming down. Where you removed the nut under the right side you will see the dash hangs on a pin right next to the bolt, lift the dash off this pin and you'll have more room to work. I loosened wire straps and tape as needed for more room to work.
The heater core cover is nearly rectangle on the right side. There are six screws holding in on. he first five are easy, number six cannot be seen without a mirror and light. I had an extra pair of hands to help with this part. The screw in the top left corner of the heater core cover is hidden. Use a mirror to see and place socket on it. Remove the cover. The heater core itself has four screws and two brackets that come off easily. Where the tubes go through the fire wall there is a bracket with one screw into the fire wall. Its hard to see and is not the screw mounting the clamps on the tubes. Go under the hood and remove the heater hoses. The heater core will slide right with some maneuvering. Reinstall the same way. It takes less time to assemble now that you have seen it.
I'm just a weekend garage mechanic and it really wasn't that bad, just take your time.
Posted on Dec 27, 2008
SOURCE: how do you replace the
You will probably need new heater hose...first check heater hoses that run from engine to the
heater core......Most hoses will tear at the end where they are connected to the core and at the engine...First mark where each hose goes then drain coolant from system and remove both hoses...Take old hose's to parts store and get new hose's and clamps...They should be dryrotted
by the year of vehicle....It is easy to bend or break new core so be very careful when installing new core....After removing old hose's from core under hood you will know the location of the core....
remove screws under passenger side dash to remove core from inside of dash...very simple very easy....It looks like a tiny radiator with an in and an out spout...dont forget to mark where hoses
connect before removal.......Be sure and refill with new coolant/clamps/hoses because of age of vehicle...Both heater hose's that connect to the core are connected at the firewall on the passenger side of the engine...The core fits into the firewall dash and is connected to an input and an output hose...THIS IS EASY FOR BEGINNERS BUT BE CAREFUL WITH NEW CORE NOT TO BEND !!
Posted on Jul 29, 2011
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