Question about 1994 Ford Aerostar Extended

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94 Aerostar using transmission fluid

I have to add transmission fluid every 3 days! Does this mean I need a new transmission or could it just be a seal that needs to be replaced? It is a 4wd extended version. Thanks for any advice.

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They have several probable leaks. if you are not seeing any leaks on the ground then it is probubly the vacuum modulator on the passenger side of the transmission. the rubber diaphram inside of the mod ruptures and engine vacuum sucks transmission fluid from the transmission and into the engine. it does not require transmission replacement to repair, however it does tend to swell the vacuum lines and cause leaks in that respect. if the fluid is leaking onto the ground you should have it checked out. either way the sooner the repair is made the more likely the problem will stay minor.

Posted on Feb 17, 2009


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It sounds like you have a leak inside your radiator, if you have an automatic transmission the fluid needs to be cooled on long trips, hard loads (towing etc) or on hot days, this is accompished the same way your engine is cooled, by running lines from the transmission then through the radiator, the air going through the rad and also the coolant from the engine cools the tranny fluid then routes the cooled fluid back to the transmission. If the lines that run through the rad have a hole in them the fluid will leak out and into the engine coolant (antifreeze) and the fluid will make it's way into the engine through the engines cooling system, the other side of this is that engine coolant is possibly making it's way to your transmission and this is an even bigger problem as the coolant does not have the lubricity properties needed by your transmission and you are soon going to have operation problems with your transmission. You need to get this fixed soon and have both the engine cooling system and the transmission flushed to remove the cross contamination.

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Every 15 years or so, take your car to a mechanic for a check. Even if you found the right place to add "fluid", and presumably you mean to the transaxle, you would need to use the right fluid and would likely have a difficult time - it won't be as easy a location as for adding oil. Crawling under your car, perhaps? Besides, maybe you should drain & replace the fluid rather than add a bit of new stuff. There's a time to rely on professionals. And there's fluids in lots of other things that might need attention too.

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There are 3 transmissions that could be in your car,the 3 speed auto and 4 speed auto overdrive,and of course the manual 5 speed.The 3 speed is designated the 3T40,the 4 speed auto is the 4T40E trans.To check the fluid level,first,the car has to be warmed up to at least 100 degrees Fahrenheit.The car has to be raised in the air,as there is a steel plug in the trans case that has to be removed to check the fluid level.The plug takes an 11 mm or 7/16" socket or wrench and is located on the passenger side of the trans case,near where the passenger side axle engages into the trans.The procedure is to warm the car up to at least 100 degrees,engage the shifter into each gear selection pausing for about 5 seconds in each gear,then remove the plug.If fluid drips out,it is full.If no fluid drips out,add fluid through the top of the trans after removing the red plastic cap,and make sure to use a long funnel to avoid a mess.Add fluid until it drips out the hole.When done,replace the plug and cap.Just a note,a transmission does not "use" fluid like an engine uses oil.If you have to add fluid,that means there is a leak that needs to be repaired.Good luck

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