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Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
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  Jim Grant's Tech TipsJim Grant's Tech Tips
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 users over the course of many years.
If you have any questions, please feel free to email us.



Lincoln - Mercury
  Jim Grant's Tech Tips

89, Chevy Pick-up, Water in the Transmission and Oil Coolers
Q: How can water be getting into the transmission of myí89 Chevy Pick-up? Iím told that it could be coming from the radiator. Can the radiator be bypassed and an auxiliary oil cooler be installed? What brand of cooler and size for anĎ89 Chev 350- 700r4 4x4 truck short bed do you recommend?

A: Most vehicles manufactured with an automatic transmission use a transmission oil cooler that is mounted inside of the radiator. The transmission oil is circulated through this internally mounted cooler to reduce the transmission oil temperature. Itís sort of surprising to think that hot engine coolant would cool transmission oil. But the temperature difference of hot transmission oil to engine coolant is great enough that it does remove heat from the transmission oil. Which is okay at best. Unless youíve been driving your vehicle in way too much water, then about the only way water/coolant could enter the transmission is through the radiator mounted transmission oil cooler. You can by-pass the cooler in the radiator. But in your case you are going to have to plug the cooler. Before doing that it will have to be rinsed thoroughly of transmission oil. After all if coolant is getting into the oil cooler, then the oil in the cooler can get into the coolant. If you want real cooling system problems just have a little transmission oil mixing in with the coolant. That combo will eat the coolant hoses up like there is no tomorrow. As for transmission coolers they are a great add-on to extend the transmissionís life. Deciding which transmission cooler would be best for your vehicle is relatively easy. The manufacturers have an application chart that will direct you to the correct size cooler for your vehicle.

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