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DOHC or OHV, How do I tell?

I have a 1999 Mercury Sable GS that overheats. I thought I'D change the thermostat but I don't know if I have a DOHC or OHV. How do you tell? Also any tips on changing the thermostat? I'm a novice mechanic but if I can see it I'll try it.

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If it's a V6 then it would be a Double Over Head Cam... Thermostat will be on top of engine where coolant outlet to upper hose is located... Hope this helps...;-)

Posted on Apr 14, 2009

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It should say on the side of the car between the front tire and drivers door or on top of motor

Posted on Mar 10, 2013


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Will a 01 mercury sable Gs transmission fit in a 01Mercury Cougar V6 2.5l dohc? I was just wondering!

Mike, is the engine in sable the same as cougar, probably not, then it will probably will not fit.
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."

Mar 03, 2016 | Mercury Cars & Trucks

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Can you please tell me some problems I would be having if my rack and pinion is out or needs to be replaced. 99 Mercury Sable 24 valve DOHC

Normal problems would be excess tyre wear, a vague feeling through the steering, perhaps knocking from the front on rough or uneven surfaces, Regards Mike

Oct 28, 2013 | 1999 Mercury Sable

1 Answer

Were is the thermosat located

For the 3.0 ohv engine follow the upper hose the the housing on the intake manifold. It will be behind that housing. On the 3.0 DOHC engine. Follow the lower hose to the water outlet housing. The thermostat will be behind that housing.

Apr 06, 2013 | 1999 Mercury Sable

2 Answers

Finding the thermostat

Just follow the upper radiator hose from the radiator to the engine, where is connects to the engine remove the hose and the cover under it to expose the T-Stat. Drain about 1/2 gallon of coolant out before you start work. Bleed the air from the cooling system (refer to service manual for this year and engine type) after the T-Stat is replaced to prevent poss overheating.

Mar 05, 2012 | 1996 Mercury Sable

1 Answer

Good Morning, I am in need of a serpentine belt diagram for a 2000 ford taurus, 3.0L W/ air condtioning. could someone please help me with this? thank you in advance.

Well, there are actually two different 3.0L engines used in a 2003 Mercury Sable. One is an Overhead-Valve (OHV) type engine. The other is a Dual Overhead Cam (DOHC) 24-valve engine. You can tell the difference by just looking at the engine or by checking the 8th digit in your VIN. For the OHV engine the 8th digit of the VIN will be a "U" and the DOHC engine will be an "S".

This is important information when it comes to getting parts or information for your vehicle.

Anyway, I have provided belt routing diagrams below for BOTH of these engines.


Jul 23, 2011 | 2003 Mercury Sable

3 Answers

Need serpentine belt diagram 4 merc sable 3.0

...are under hood, a diagram on top of radiator support.

Feb 12, 2010 | 2004 Mercury Sable

3 Answers

I need to find out if my 97 mercury sable is a sohc or a dohc

The 8th Vin number tells what enigne, for any car. If its a "U" its OHV if its "S" its the DOHC

Nov 06, 2009 | 1997 Mercury Sable

1 Answer

1989 Mercury Sable, 3.0L V-6, Auto Trans. Engine Idles at about 2000 RPM.

Check your vacuum hoses (They are 3/8" Rubber hosing on the right side of the engine, you will need to remove the air intake piping (Also remove the throttle body to make accessing them easier) This is the #1 cause of high idling in the 3.0 OHV and 3.0 DOHC sable engines.

Jan 17, 2009 | 1989 Mercury Sable

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