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Old May 18th, 2008, 04:15 PM
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stephen beacham
97 defender 90
Join Date: Apr 2008
Location: wilmington, nc
Posts: 19
correct engine temp

i have a 97 d-90 with a 4.6. It seems to run ok, i was just curious what the proper engine temp range should be under normal driving conditions. mine seems to be around 210 degrees. also what level should the expansion tank be at when engine is cold? thanks for the help
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Old May 19th, 2008, 01:05 PM
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Gren Thomas
1985 90 300tdi auto
Join Date: Feb 2005
Location: bridgend, wales , UK
Posts: 413
Hi stephen,

the best answer is a couple of degrees above the opening temp of the thermostat, this can range from 77 to 88deg C on standard V8's so a running temp of 90deg with an 88 deg thermostat is common.

the rating of the 'stat will be stamped on it.

The level should be marked on the expansion bottle depending on the type, again however half full is always a safe bet.


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Old May 19th, 2008, 02:09 PM
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Bryan Tate
Join Date: Aug 2004
Location: Wilmington, NC
Posts: 479
I got 190F at the vdo dash gauge and measured 200F with the "laser gauge" aimed at the temp sensor housing.
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Old May 19th, 2008, 03:36 PM
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Chris Davis
94 NAS D90 6.2LS
Join Date: Nov 2003
Location: Colorado
Posts: 2,500
I run about 190F. I have a 4-core radiator, Thermoflex fans. I rarely get to 200, but if I am traveling up hills in the mountains, I can. Nothing to really worry about until 210-220, IMO.
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Old October 3rd, 2008, 08:21 PM
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1995 SW #487/500
Join Date: Sep 2003
Location: The Old North State
Posts: 7,522
any other thoughts on this. I seem to get around the 190 mark in town but on the interstate I was 200-210 range running 70-75? I think those Hellas in front of the radiator might be part of the problem. TBD.
Poor gas mileage gets you to the best places on earth
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Old October 6th, 2008, 09:34 AM
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S. Smith
72 Series III 109 Diesel
Join Date: Jun 2007
Location: Under my truck!
Posts: 753
VDO temp guage 180 to 195 with stock radiator in summer and 180 -185 in winter
72 Series III 109 SW Diesel, 03 RR, 98 Porsche 986, 01 Porsche 986 3.6 L
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