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Another Heat Related post

Ok...Got teh damn low temp thermo in, fan switch...new radiator last summer...bled system....

STILL runs hot at stand still....

DO the fans have several speeds?

The passanger side runs like crazy
The driver side runs...but slower..

Im thinking...replace fan?????
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Old 06-10-2004, 01:28 PM
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when you put the lower temp thermostat in, it actually has the opposite effect on cooling. The thermostat's job is to trap water in the radiator so that the fans can cool that water. By putting a lower temp one in, the water doesnt stay in the radiator as long as it would if the thermostat was rated higher. Eventually it willl just stay open and circulate thru the system with little or no chance to cool.
Put an OE thermostat and cap on and go from there. Does it cool off when you run down the road and heat up in traffic, or what? As far as I am aware the fans only have one speed, and it should keep cool with just one fan because the other is for the A/c (please correct me if I am wrong)!
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Old 06-10-2004, 01:56 PM
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Only gets hot while sitting still. Runs Super cool while moving.

Did it with the OE Stat in as well.
Thats one thing I didnt replace was the cap...
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Old 06-10-2004, 02:04 PM
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Quote:
Originally posted by Texas944
when you put the lower temp thermostat in, it actually has the opposite effect on cooling. The thermostat's job is to trap water in the radiator so that the fans can cool that water.
Wait a second here.....
your thermostat is closed at low temp, so that the radiator is cut out of the loop. This way the engine itself can warm up faster. THAT is the thermostat's job. If you put in a lower temp thermostat, it just opens up the radiator to the rest of the system at lower temperature. In other words, the purpose of the thermostat is meant to keep the engine warm, not cool. By lowering the thermostat temp, you give the engine a lower minimum temp.
I've run my 944 with both the OEM and lower temp thermostat, and the lower one definitely lowers operating temp.
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Old 06-10-2004, 02:09 PM
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I alsways thought a lower temp stat allowed the enigine to run cooler
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Old 06-10-2004, 02:11 PM
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Lower temp thermostats do allow the engine to run cooler, If your gonna run a lower temp themostat I would alos get a lower temp fan switch too. Also my 924S turns Both fans on when cooling drops temp fast
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Old 06-10-2004, 02:17 PM
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Yeah..I got the lower temp switch..unless They sent me the wrong one...
hum....

Ill read teh manual some more and maby switch teh fan out ( i have a few spares.)
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Old 06-10-2004, 02:30 PM
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My fans dont cut on till teh 3rd mark.

They must have sent me the wrong one...Oh well...Since im gonna change the fans anyhow...no harm...Ill just put another swithc in while i have them out.
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Old 06-10-2004, 02:56 PM
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www.944online.com carries them as well. $17 IIRC for the thermoswitch
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Old 06-10-2004, 03:07 PM
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Got it from Pelican. It said 75 degree.
The other one Pelican had was 92/102 degree.

After looking at it again...I ordered teh stock thinking I order a low temp.

My bad.
Ill order one from performance.
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Old 06-10-2004, 03:10 PM
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The temperatures of the thermostat and the thermoswitch must match.

Lower one and you must lower the other.



Many have been there and been confused by that.
There have been many threads on this and a few articals written.

The previous owner said my car had a life full of cooling problems. He said everything was oem. Come to find out the thermoswitch was a middle temp one. the thermostat high temp (oem).

Changed them both to the lower temp and it is truly fixed.
Changed the thermoswitch first with little effect.
Changed the thermostat to match and all is perfect.


You OEM guys remember that this car was not exactly designed for warmer climates.
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Old 06-10-2004, 03:32 PM
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What's the OEM thermostat open temp?
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Last edited by idontknow; 06-10-2004 at 04:04 PM..
Old 06-10-2004, 03:53 PM
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It gets damn hot here (over 100)

What about bridging the switch so they run all the time in the summer? Am i correct that all teh switch does is activate the fans?
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Old 06-10-2004, 04:00 PM
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Bridging the switch will leave the fans on ALL the time. Well, till it drains the battery.
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Old 06-10-2004, 04:05 PM
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Oh yeah,forgot they come on when the car is off and hot.

Doh!
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Old 06-10-2004, 04:08 PM
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run the switch to a free toggle switch by the shifter ????

This way, they run all the time, then flip them off when you pull the key, then the thermal switch takes over.

Just a thought....
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Old 06-10-2004, 07:31 PM
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Ill wire them to the radio antenna!

NOT......
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Old 06-10-2004, 07:36 PM
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Quote:
Originally posted by FR Wilk
I have both low temp thermostat and low temp thermal switch. The lower temp thermal switch really makes a difference. Fans kick in with the temp needle straight up. I can't run my A/C in LA in the summer without it.
my fans come on just above the first line.
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Old 06-10-2004, 08:00 PM
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Use a heavy duty switch. There's a lot of amperage that goes through that thermoswitch, and it'll fry cheap little ones.

By the time you wire in everything and fit the switch, you could have saved a lot of aggrivation by simply replacing the thermoswitch with a lower one..
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Old 06-10-2004, 08:07 PM
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i'm wiring up the second fan on mine to a toggle switch as don suggested. I have some big beefy breaker switches i can use... just need a place to mount 'em. If you go the route of using a relay, you can get away with one of the smaller switches.
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Old 06-10-2004, 08:10 PM
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