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Befuddled ... engine temp ... after new Tstat
I am Befuddled:
My '91 300E coolant temp has been running at or just below 80c after ten minutes and more of driving at ambient temp of 60-70f. So I replaced the Tstat thinking this was the problem. The car still hardly shows anything above 80c. Now I am wondering is it the Tstat or possibly a bad sending unit? Questions: -How do I test the sending unit to the temp gauge? -Is sticking a thermometer into the coolant reservoir a good test of the true engine coolant temperature? I checked the coolant and it does need more anti-freeze, it only goes down to about +5 degrees. Not a problem though here in N. California. Any suggestions? Thanks as always.
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'03 E320 Wagon-Sold '95 E320 Wagon-Went to Ex '93 190E 2.6-Wrecked '91 300E-Went to Ex '65 911 Coupe (#302580) |
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Did you use a dealer or OEM t-stat?
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I used a dealer (MBZ) Tstat.
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'03 E320 Wagon-Sold '95 E320 Wagon-Went to Ex '93 190E 2.6-Wrecked '91 300E-Went to Ex '65 911 Coupe (#302580) |
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Re: Befuddled ... engine temp ... after new Tstat
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Somebody already mentioned this ...
on a different tread but, did you check the water pressure cap?
aka: coolant cap
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J.H. '86 300E Last edited by J.HIDALGO; 05-29-2002 at 03:55 PM. |
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Thanks for the replies.
My guess is that the sending unit is bad. Am I correct in believing that the sending unit has two connectors on it. It is between the valve cover and the air cleaner?
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'03 E320 Wagon-Sold '95 E320 Wagon-Went to Ex '93 190E 2.6-Wrecked '91 300E-Went to Ex '65 911 Coupe (#302580) |
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Haasman:
Yes, the coolant temp sensor is located on the head (two pole blue), second from the rear on your '91 300E. If you have a multimeter with a resistance function you can test it before replacing it. ($31) ~Paul _________________ '91 300E, 212K miles |
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