Which Direction should the thermostat face in a 5.0? - Ford Mustang Forum
 
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post #1 of 13 (permalink) Old 05-05-2007 Thread Starter
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Which Direction should the thermostat face in a 5.0?

Whaz up everyone I have an 86 5.0 and even though the guage does not read high I know she runs kinda hot so I took it to a radiator shop where they said the coolant was not circulating so they told me to take the thermostat out and run it like that because my guess is the thermostat is in backwards and I want to know what direction is it supposed to face. Because if thats the case I want to just correct it now instead of doing something that i hear could damage the engine even though they said you don't need a thermostat in the summertime so it won't hurt the car.
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post #2 of 13 (permalink) Old 05-05-2007
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Spring points toward engine. Just changed mine 5 min ago. Although, running without one won't kill anything it just won't warm up as well.

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post #3 of 13 (permalink) Old 05-05-2007 Thread Starter
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Yeah I just checked it it was in there right so I just went with a 180 thermostat the other was a 195 which comes to findout is not even stock because stock is 192 so after this gasket sealent dries i'm gonna start her up and see if this gets the coolant pumping like it's suppose to
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post #4 of 13 (permalink) Old 05-05-2007
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I've heard that running without a thermostat can actually cause the car to overheat because the coolant is circulating through the engine too fast to pick up a significant amount of heat from the engine.

The thermostat regulates the flow allowing for the engine heat to be transferred into the coolant and then to the rad to be cooled.

A mechanic told me this once, just thought I would pass it along.
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post #5 of 13 (permalink) Old 05-05-2007
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Hope you have better luck than me. I think I was running with a stuck open thermostat for years. On the stock gauge , always ran low.

Then after a major tune up. Started running on the Hot side.

I have replaced everything except for the water pump. ( 197 deg Thermostat, Clutch fan, the fan, 3 core radiator, Air deflector, All coolant hoses, Gauge sensor)

Now she runs about half way on the stock gauge. Still seems a little warm. (the Intake gets pretty hot)

Anyways. I have a Motorcraft 180 thermostat to install).

Then I am going to replace water pump , since it is the only thing left. Maybe it is getting a little weak. Not leaking though from the weep hole. there is a little movement in the bearing. not much
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post #6 of 13 (permalink) Old 05-05-2007
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If you need any parts. I have a 2 core radiator (no leaks) Installed in 2001 but the car was in storage for 3 years.

Also have upper and lower hoses ( only about a month of use ) went with the silicone blue ones.

A clutch fan that seems to be in descent shape.

Radiator Cap only used for about 3 months

Just pay for shipping if you need anything.
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post #7 of 13 (permalink) Old 05-05-2007 Thread Starter
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I've replaced the thermostat with a 180 and now it just goes up to the first line of normal on the gauge and it takes a long time to get there I know it's not my water pump I just replaced that a couple weeks ago also I've noticed my upper hose will get hot but when I squeeze it I don't feel a surge. I'll probably just take it to the ford dealership JUST for a dianostic if all else fails but first I'll try replacing the radiator cap because I've never replaced that also the coolant teperature sending unit
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post #8 of 13 (permalink) Old 05-06-2007
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Mine reads low too... I think that's normal though. It doesn't take long for it to come up to operating temp, but the guage never really goes any higher than that first or seccond line on the stock gauge.
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post #9 of 13 (permalink) Old 05-06-2007
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mine stays between the a and the m in the word normal on the gauge in almost all driving when fully warmed up.
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I just put in a 160 stat and it only gets between the first and second bar in the normal range.

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Quote:
Originally Posted by sheba View Post
I've replaced the thermostat with a 180 and now it just goes up to the first line of normal on the gauge and it takes a long time to get there I know it's not my water pump I just replaced that a couple weeks ago also I've noticed my upper hose will get hot but when I squeeze it I don't feel a surge. I'll probably just take it to the ford dealership JUST for a dianostic if all else fails but first I'll try replacing the radiator cap because I've never replaced that also the coolant teperature sending unit
I have the exact same problem with my car. I have replaced the water pump, thermostat, flushed and filled coolant, and air blew my heater core... still the heat is not so good.

2006 Mustang GT in Torch Red
C&L Intake, Evolution Performance Tune, Borla Axle Backs, Hurst Shifter, 4.10's, JBA Long Tubes, Prothane Engine Mounts, Steeda UDPs, FRPP Charge Motion Delete Plates

84 Bronco, 302 C6 on 32 10.50's
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post #12 of 13 (permalink) Old 05-06-2007 Thread Starter
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Kyle try changing your radiator cap thats what I just did today and shes running normaly now the needle goes up to between the "N" and the "O" which is a lil lower than where she was but I did replace the 195 thermostat witha 180 so I guess thats why but again I changed my radiator cap and now it seems the coolant is flowing properly
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I run a 180 thermostat in my car, but it's carbed. If I'm not mistaken the efi cars are designed to run a hotter thermostat, like 192 or 195, and will not run as well with the 180.

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