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Old 05-26-2001, 01:16 PM
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My temp needle goes up and down at different times of the day, not depending on outside temp or if a/c is on or off. Any idea whats wrong.

[Edited by amg142 on 05-26-2001 at 04:33 PM]
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Old 05-26-2001, 07:31 PM
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Join Date: May 2001
Posts: 104
Temp readings

Maybe a t-stat sticking, thats what I woulds try. I have seen these where the gauge would go high until the stat opened and then dump cold coolant until it closed and repeat the process. Good Luck
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Old 05-26-2001, 07:33 PM
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like a noodle
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Old 05-26-2001, 11:41 PM
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Join Date: Oct 2000
Location: Taiwan
Posts: 21
Is it possible that the fuse for low speed aux. fan was burn out. I remembered this fuse was recommended to be 25A instead of original 15A.
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Old 05-27-2001, 09:34 AM
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another thing, is that when i shut the car off, the water in reserve bubbles.

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Old 05-27-2001, 09:52 AM
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Join Date: May 1999
Location: New Location: VA Palo Alto HEALTH CARE SERVICES
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this sounds weird to me. air is present in your coolant reservoir, looks like that the system is getting pressurized intermittently. Doesn't look normal, ..are you loosing coolant too ? Your temp sending unit is sensing various temp changes. Check if there's presence of oil in the coolant..
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Old 05-28-2001, 03:13 PM
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Join Date: Jan 2001
Location: the Netherlands
Posts: 1,417
Open the hood, remove the cap on the water reservoir, fill the reservoir till the top while the (recently used) engine is running and REV it a couple of times. If the water comes blowing/boiling/sputtering out of the water reservoir, you have a leaking head gasket (causes the engine temp to float around).
Watch your head incase the (hot) water does come blowing out of the reservoir!

1990 300SL-24
1993 C250D
with a minor 600+k kilometer
(the Netherlands)
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