Question about 1984 GMC S-15 Jimmy

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The fluid from my transmission is mixing with radiator fluid. I was told that the core is burnt out in my radiator, and all that was needed to be done is to replace the old radiator with a new one and change the fluid in the transmission. Is this correct? And how do I change the fluid in a mid eighties GMC Jimmy? Are there any other things that might need to be done?

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Replace the radiator with a used or new one is correct ! to flush trans you will need roughly 8 to 12 quarts trans fluid. After you replace radiator connect rubber hoses to trans lines and put into 5 gal pail. put funnel into trans filler tube, have trans fluid ready with caps off and ready to pour, Now note, this happens pretty fast as the trans pump pumps alot of fluid quickly !! Have a helper !! After the radiator is in ,and trans lines in bucket, start to fill trans with fluid as your helper starts truck, continue to fill trans as fast as you can about 6 quarts, the old fluid will pump into the bucket. shut truck off. connect trans lines to radiator. check trans fluid with dipstick, fill to full mark, start truck and fill trans the rest of the way to full. It sounds scary but really its not bad. brace the hoses in the bucket as the pressure might push hose out of bucket and make a mess, have floor dry on hand, and dont let trans run out of fluid. thats it easy.

Posted on Jan 16, 2011

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Hello
What happened is the tube that goes thru the radiator sprung a leak and coolant is getting in the trans and visa-vera so the answer that you got is 100% correct. But you have to change trans fluid and coolant and do NOT drive or you will be buying a new trans. Thanks

Posted on Jan 16, 2011

  • John U Jan 16, 2011

    To change the trans fluid you have have to drop the trans pan take all the bolts out except one crack the seal on the pan and let it drain. you need a big drain pan. it is a messy job.

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