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Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by ALLDATAdiy.com users over the course of many years.
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  Jim Grant's Tech Tips

'92 Chevy Astro, Overheating Transmission

Q: I have a '92 Chevy Astro van. I was towing a 3200lb trailer camper and I overheated my transmission and fluids started flowing out. I was driving in overdrive for about 30 mins. Any advice on proper driving procedure when towing ? The towing capacity of Astro vans is somewhere in the vicinity of 5000 lbs.

- Fred C.

A: What does your van have for a transmission cooler? I would suggest adding a cooler if the transmission oil is only cooled by the cooler in the radiator. Also you should check the flow rate of the transmission cooler. Your transmission cooler should flow rate of 1 quart of transmission oil in 15 to 20 seconds. If the flow rate is low then there is likely a restriction in the cooler or the transmission cooler lines. I would not suggest operating the transmission in overdrive when towing a trailer. Many vehicles with a factory towing package have a switch to lock-out the overdrive of the transmission when towing.

 
     
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