Question about 1987 GMC R1500

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For 1985 suburban does transmission fluid also act as a coolant for the transmission?

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  • tts1976 Jul 26, 2009

    Thank you! This was helpful.

  • tts1976 Jul 26, 2009

    Thank you! This was helpful.

  • tts1976 Jul 26, 2009

    Thank you! This was helpful.

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Yes indeed. The trans lines run to the rad where there is a cooler built in.

Posted on Jul 26, 2009

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Lubricant & cooling, as it circulates through rad or external cooler and back through to keep cool.

Posted on Jul 26, 2009

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Yes. and it is essential that it either passes through the cooler in the radiator or a quality trans cooler.

Posted on Jul 26, 2009

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2 Answers

Transmission whines when cold and shifts on the edge


Sounds like it maybe slipping, try checking the transmission fluid level and add as necessary to full mark of near full mark, which is in the operating range, could do what I did with my windstar minivan, add in the Lucas Transmission Fix, for your Ford Taurus you'll need Mercon ATF ( Automatic Transmission Fluid ) unless its a manual transmission or differently specified which then will need different fluid, check the owners manual, repair manual or phone Ford and ask them for transmission fluid type. Keep in mind that the wrong fluid type in transmission and or wrong amounts ( overfilled ) or ( underfilled ) can affect the transmission's proper operation.


Also check your coolant, when coolant level is low the light will come on the dash cluster and add as needed, Fords usually use the green coolant,green colored coolant or could use the universal type coolant. Check the owners manual, look in a repair manual or ask Ford technician for the coolant type.

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I have a 94 Suburban. About a month ago I noticed a constant gumping noise near the front driver's side. It did it about twice in one day about ten seconds and stopped. It was suggested I need some oil. I...


Thanks for choosing FixYa and welcome. Check all your fluids. Oil, coolant, and transmission. It is a sign of low fluid to something. Check all levels.

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From 30-40 mph acts like its not shifting into overdrive right and makes a grumbling sound. Given more gas then it shifs and its ok.


CHECK TRANSMISSION FLUID LEVEL IF FLUID LEVEL OKAY PROBLEM COULD THE TORQUE CONVERTER OR TRANSMISSION OIL PUMP FAILING.

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Where is transmission fluid fill on '86 GMC Suburban


get a funnel and pour it into the dip stick hole that you use to check the fluid level with.

Jan 01, 2010 | 1986 GMC Suburban

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Is transmission cooler located inside of radiator on 99 chevy suburban? (OEM) car froze at -3 temp fear we have antifreeze in trany fluid, fluid resivore is to full. also water leaking out under car...


I would not worry about antifreeze in the transmission. The pressure in the tranny cooler will not let any coolant get in. If it was leaking you would have tranny fluid in the radiator. You may have some freeze plugs that have pushed out or a cracked block or some coolant passage above the transmission. Get it pressure checked

Dec 13, 2009 | 1999 Chevrolet Suburban

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Loosing water out of radiator and overflow tank has greasy look in the bottom. Also transmission fluid appears to have been sprayed over undercarriage at the rear of transmission.


You need to carefully check over the entire cooling system and engine for leaks. I can't see that far...Residue in tank is likely normal...never seen one that is clean. You don't want to see actual oil floating in there or in the radiator. Under the car, the trans fluid should be cleaned up with a rag, then run it and ...look carefully for seepage. Most common is the pan gasket or driveshaft seal, but check everything. You have the advantage here...you can look at it, I cannot.

Jun 09, 2009 | 1985 Chevrolet Suburban

1 Answer

2003 Dodge Neon SE the car acted like it was in neutal


As detrimental as coolant is in the engine oil, it has a much worse affect in the transmission fluid as its a thinner fluid and does not have the additive package that a motor oil does.

Here's how I would approach this:

To replace the cooler (its probably in the radiator) means they will likely have to replace the radiator and then the rebuild of the transmission is going to be up there as well. So all this is going to be considerably expensive.

You could go that route if you wish, but you could also take a chance and have an after market transmission cooler installed (by-pass the one in the radiator completely so you dont have the risk of coolant in your transmission again) and then have a thorough transmission flush done with a new filter installed.

Now, you are likely looking at a few hundred dollars minimum if you have the dealership do this but Im thinking that the reason the car acted like it was in neutral was due to the lack of transmission fluid because of the cooler line busting.

If you can do this work yourself you could probably do it all for less than $200 and if everything works out and the transmission is not damaged and works properly, you've saved yourself a good chunk of change. If it doesnt work and continues to have problems, then you can decide if the repair bill will be worth it to rebuild the transmission.

The key think here will be doing a very thorough transmission flush to get any traces of coolant out of the system and a new filter. Hope this helps.

Jan 02, 2009 | 2005 Dodge Neon

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