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  #1  
Old 06-11-2007, 12:49 PM
Lead's Avatar
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Join Date: Jun 2007
Posts: 29
is my 300SE overheating??

Just purchased a nice used 1991 300SE ....
the car seems to run perfect..except the temp guage is always peged at 120c + after running awhile.

I used a thermal gun on the engine to confirm temps when the guage is pegged at 120c...this is what im getting...

Operating abmient temp is 75F ish (socali)
at thermostat housing 225F
at top radiator hose 180F
at bottom radiator hose 165F
at expansion tank 120F

do you guys think i may have a faulty "water-temp-sender"?
Please help.....as i dont want to risk overheat my engine...

Lead
91 300SE

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  #2  
Old 06-11-2007, 01:12 PM
david s poole
 
Join Date: Mar 2005
Location: dallas
Posts: 1,822
sounds like a new thermostat is required.yours is prob stuck half open.easy job,cheap part.
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  #3  
Old 06-11-2007, 01:52 PM
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Location: Florida / N.H.
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At temps like that , you should be seeing aux high fan activation...do you ????
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  #4  
Old 06-11-2007, 04:05 PM
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yes aux fans are comming on....and I'm turning on my heater to help cool her down...
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  #5  
Old 06-11-2007, 04:57 PM
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Location: Florida / N.H.
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Quote:
Originally Posted by Lead View Post
yes aux fans are comming on....and I'm turning on my heater to help cool her down...

Well, then as other poster says. change the thermostat ..
If high fan is coming on, it is not the gauge that is wrong.

Last edited by Arthur Dalton; 06-11-2007 at 06:13 PM.
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  #6  
Old 06-11-2007, 06:31 PM
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Join Date: Sep 2006
Location: New Orleans LA
Posts: 93
overheating

I hope the head gasket didn't let go have you lost water or could be low on coolant but you must look to see what caused the problem like they said thermostat or a leak or water pump check the radiator for cracks at the neck
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  #7  
Old 06-11-2007, 06:58 PM
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No coolant loss or smoke from tail pipe so far...so I think my head gasket is prob still ok...thanks guys....ill change out my t-stats as recommended.
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  #8  
Old 06-12-2007, 04:31 AM
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replaced my tstat...temp guage now reads about 80-90c...thanks again guys for the great advice!

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