Radio, top, cooling fan and fuel gauge doesnt work

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Mar 13, 2019 | 10:31 AM

#21 (permalink)

Jim Holian

Forum Regular

Joined: Nov 2017

Posts: 521

Likes: 19

From: Alexandria, Kentucky

Re: Radio, top, cooling fan and fuel gauge doesnt work

Thanks, pizzaguy. That give's me some information that I didn't understand from the previous post's.

Jim

Mar 13, 2019 | 01:19 PM

#22 (permalink)

onehundred80

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Joined: Apr 2006

Posts: 25,432

Likes: 647

From: Ontario

Re: Radio, top, cooling fan and fuel gauge doesnt work

I am sure my fan does not work on a cold engine and only when it gets hot enough to require coolant cooling or when the AC is turned on.

May 31, 2019 | 08:55 PM

#23 (permalink)

WD40

Forum Regular

Joined: May 2019

Posts: 756

Likes: 138

From: Alabama

Re: Radio, top, cooling fan and fuel gauge doesnt work

I'm a moderator over on the LOTUSELANCENTRAL forum. Although I still have my privileges I haven't posted for 4 or 5 years. I had 3 of those cars over a span of 11 years and knew every nut & bolt that existed. Reading your posts such as in this thread let's me know I'm starting over again at the bottom of a very tall hill! It sure is easier though, than before the internet came along.

May 31, 2019 | 11:55 PM

#24 (permalink)

pizzaguy

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Joined: Jun 2009

Posts: 13,959

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From: Fort Worth, Texas

Re: Radio, top, cooling fan and fuel gauge doesnt work

Quote:

Originally Posted by onehundred80

Surely the fan does not run on a cold engine?

NO, it does not. But very narrow pulses are sent from the ECU to the FCM and the FCM must respond with an "answer pulse" to keep the dash light off.

If the ECU wants the fan to run (say because you turned the A/C on), it will widen it's pulses quite a bit, this tells the FCM to run the fan.