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engine running too cool.

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Old 08-31-08, 12:27 AM
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engine running too cool.

ok so here is the story. i have an 1988 convertible and i live in Florida ( really hot here) my cars temperature stock temperature use to read half way and go up to 3/4th when i drove it hard. peak 50/50 antifreeze/coolant and 1qt of water wetter and i dint see much of a difference. turns out my cheap e fan sucked so i went to the stock fan clutch system with fan shroud and double pulley alternator. but ever since i changed the system my cars temp gauge is barely above the cold line even when i drove it really hard. i have an autozone thermostat at the moment( will be getting oem thermostat this week) now that you have heard the story on to the point. is this a bad thing? could this cause damage to my engine? and if it can how serious and how fast? any info would be useful. thanks in advance guys.
Old 08-31-08, 01:16 AM
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That's normal.


-Ted
Old 08-31-08, 01:19 AM
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thanks ted =)

how long should i give the engine to warm up on a cold start?

Last edited by Aaron Cake; 09-01-08 at 10:06 AM. Reason: Merge two posts
Old 08-31-08, 09:39 AM
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Just let the engine idle for half a minute or so, then drive it. However, keep the revs low until the temp gauge is up to about 1/3 (normal). Letting it sit there and idle just wastes gas.
Old 08-31-08, 09:41 AM
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mines runs around 190-200|F and i leave in florida. think thats too hot?
Old 08-31-08, 10:10 AM
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Originally Posted by xboxthug13b
mines runs around 190-200|F and i leave in florida. think thats too hot?
Your thermostat doesn't open till @185°, so 5-15° above that is pretty efficient.
Old 08-31-08, 05:06 PM
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so should so if i have been driving the car for 15 minutes and its still cold. should i wait longer or would it be ok to drive it hard after that
Old 08-31-08, 05:43 PM
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Wait a sec... after 15 minutes, your needle still isn't up to 1/3 - 1/2? Your t'stat could be stuck. The consensus seems to be use ONLY a mazda oem t'stat.
Old 08-31-08, 08:08 PM
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like i said on my main post my needle is slightly above cold all the time no matter how hard i drive it. im getting an oem thermosat this week.
Old 08-31-08, 09:52 PM
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Originally Posted by xboxthug13b
mines runs around 190-200|F and i leave in florida. think thats too hot?

Mine runs about 190 in the dead of summer. Vert in FL as well. With the a/c on.

That is normal.
Old 09-01-08, 12:22 AM
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Originally Posted by wilderg88
like i said on my main post my needle is slightly above cold all the time no matter how hard i drive it. im getting an oem thermosat this week.
A bad thermostat would most likely make the car run too hot, not too cold.
I'd suspect the water temp sending unit or the gauge itself.
Old 09-01-08, 09:37 AM
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I had a stuck t'stat in my car and the symptoms would be that it would take 20 minutes for the temp gauge to climb to 1/3. It also ran hot on the highway, but cool around town.
Old 09-01-08, 10:07 AM
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Normal temp on the gauge for S4 is about 1/4 or so. Normal temp is about 1/2 on S5. Everything here sounds normal.
Old 09-01-08, 12:46 PM
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alright thanks guys
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