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Old 02-18-2013, 01:14 PM   #1
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Running hot.

My car runs a bit hot probably like 210 ish. Possibly the thermostat sticking? What should I do to make it run cooler so when I put my underdrive pullys on it doesn't over heat. Should I throw in a 175 thermo stat instead?
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Old 02-18-2013, 02:07 PM   #2
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Do you have under drive pulleys?

---------- Post added at 02:07 PM ---------- Previous post was at 02:06 PM ----------

Is your T-stat in backwards? Is your radiator getting hot? Do you have heat when your car blows? Have you checked for air in your coolant?

Underdrive pulleys cause 9/10 people nothing but overheating issues and charging issues, so I'd avoid that route...
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Old 02-18-2013, 04:33 PM   #3
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210°F is just where it is supposed to be, the stock thermostat begins to open at 199° and is fully open at 219°. So 210° indicates it is doing its job as intended. Installing UDPs will not change that as the pump will still flow plenty of coolant.

If it were not moving enough coolant installing a thermostat with a lower opening temperature (they are rated by there opening temperature) would not help because if there is not enough flow to keep the engine at 210° there certainly would not be enough to keep it at any lower temperature.

As to the thermostat itself 185° is as low as you can go without changing the tune, and even at that there are settings that really ought to be changed:
  • Engine cooling fan low speed ON (stock = 214°);
  • Engine cooling fan low speed OFF (stock = 208°);
  • Engine cooling fan high speed ON (stock = 228°);
  • Engine cooling fan high speed OFF (stock = 224°);
  • ECT Stabilised Open Loop Fuel table switch (defines the ECT to switch to the SOL table default = 180);
  • ECT Warm-up temp (the temp at which the PCM considers the engine warmed-up, default = 172°);
Those are the "biggies", they are a few others as well.

I run a 185° unit with these settings:
  • Engine cooling fan low speed ON = 204°
  • Engine cooling fan low speed OFF = 198°;
  • Engine cooling fan high speed ON = 218°;
  • Engine cooling fan high speed OFF = 214°;
    note: these settings keep the fan from running "all the time"
  • ECT Stabilised Open Loop Fuel table switch = 170°);
  • ECT Warm-up temp = 168°;

A 175° thermostat would be far too low for out engines.
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Old 02-19-2013, 04:45 PM   #4
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Old 02-19-2013, 06:54 PM   #5
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Quote:
Originally Posted by cliffyk View Post
210°F is just where it is supposed to be, the stock thermostat begins to open at 199° and is fully open at 219°. So 210° indicates it is doing its job as intended. Installing UDPs will not change that as the pump will still flow plenty of coolant.

If it were not moving enough coolant installing a thermostat with a lower opening temperature (they are rated by there opening temperature) would not help because if there is not enough flow to keep the engine at 210° there certainly would not be enough to keep it at any lower temperature.

As to the thermostat itself 185° is as low as you can go without changing the tune, and even at that there are settings that really ought to be changed:

[*]Engine cooling fan low speed ON (stock = 214°);[*]Engine cooling fan low speed OFF (stock = 208°);[*]Engine cooling fan high speed ON (stock = 228°);[*]Engine cooling fan high speed OFF (stock = 224°);[*]ECT Stabilised Open Loop Fuel table switch (defines the ECT to switch to the SOL table default = 180);[*]ECT Warm-up temp (the temp at which the PCM considers the engine warmed-up, default = 172°);

Those are the "biggies", they are a few others as well.

I run a 185° unit with these settings:

[*]Engine cooling fan low speed ON = 204°[*]Engine cooling fan low speed OFF = 198°;[*]Engine cooling fan high speed ON = 218°;[*]Engine cooling fan high speed OFF = 214°;
note: these settings keep the fan from running "all the time"[*]ECT Stabilised Open Loop Fuel table switch = 170°);[*]ECT Warm-up temp = 168°;


A 175° thermostat would be far too low for out engines.
It seems like your a book of useful mustang facts!
That's awesome information. Where do you get all this from?
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Old 02-19-2013, 07:22 PM   #6
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Quote:
Originally Posted by zinc_yellow View Post
It seems like your a book of useful mustang facts!
That's awesome information. Where do you get all this from?
55+ years of owning/driving/repairing automobiles--and learning everything there was to know about each of them I have owned...
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Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.

New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq
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