Low Coolant
Thread Starter
Le Mans Master
Joined: Jul 1999
Posts: 7,072
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From: Maryland
Low Coolant
Overflow tank is topped off to full level. '87 700R4 w/ 123k mi has a new rad / cooling system / hoses and is not running hot. I get the Low COolant light intermittently when it's cold out. Once it gets up to almost 50 degrees outside temp it doesn't come on. This was a problem last spring, but then I didn't see the Low coolant light once all summer (hot weather). Now that it's getting cold again it's giving me the ligh. :( Where is the sensor and what does it take to swap it out? Does it require a full coolant drain (flush would be a good idea anyways). Thanks, ~Juliet
Race Director
Joined: Aug 2000
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Cruise-In II Veteran
Re: Low Coolant (Juliet)
That sensor is on the radiator tank,just below the Fill cap a few inches down...youll see a wire(I think its green) coming off the sensor there)
The sensor has two side clips that allow it to stay on the radiator tank but it also has an O ring inside it so it need to "pop" out of there when prying it out.
Very easy to change if defective and you dont need to drain everything out,maybe just let some out halfway.
Btw that sensor seems to throw false codes alot.Wether its an air pocket,its cold out or what have you it loves to light up and scare ya for a few.
Hope this helps.
:)
The sensor has two side clips that allow it to stay on the radiator tank but it also has an O ring inside it so it need to "pop" out of there when prying it out.
Very easy to change if defective and you dont need to drain everything out,maybe just let some out halfway.
Btw that sensor seems to throw false codes alot.Wether its an air pocket,its cold out or what have you it loves to light up and scare ya for a few.
Hope this helps.
:)
Team Owner
Joined: Dec 2000
Posts: 90,675
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From: SE NY
Cruise-In II Veteran
Re: Low Coolant (Juliet)
Assuming you've "burpped" the cooling system to remove any trapped air, you might want to pull the overflow resevoir and inspect both the rubber hose that feeds into it and the plastic tube it attaches to.
The hose can develope a crack that causes the system to lose vacuum and the plastic tube can become clogged. Either condition can prevent the coolant from being drawn into the radiator when the level drops.
The hose can develope a crack that causes the system to lose vacuum and the plastic tube can become clogged. Either condition can prevent the coolant from being drawn into the radiator when the level drops.
Thread Starter
Le Mans Master
Joined: Jul 1999
Posts: 7,072
Likes: 4
From: Maryland
Re: Low Coolant (65Z01)
Thanks for the feedback. The reservoir and hoses were replaced about 20k miles ago when I had a new radiator put in the car. The system has been burped. I'm thinking that when it gets cold out the resistance changes or something because the sensor is on it's way out and it just hits the threshold it turns the light on. It won't hurt to flush the cooling system. :yesnod:
Anything in particular to watch out for? It will be a month before I can get access to the lift in the garage (Greg's C2 is in engine swap), so I might just take this down to the local service station and have them drain the coolant / put in the sensor / refill (with me hovering around watching of course) :lol: Seems easy enough.... it's due for an oil change anyways....
Anything in particular to watch out for? It will be a month before I can get access to the lift in the garage (Greg's C2 is in engine swap), so I might just take this down to the local service station and have them drain the coolant / put in the sensor / refill (with me hovering around watching of course) :lol: Seems easy enough.... it's due for an oil change anyways....
Le Mans Master
Joined: Aug 2000
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From: Airport Cruise-in 1 Veteran Airport Cruise-in 2 Veteran
Cruise-In II Veteran
Re: Low Coolant (Juliet)
I might just take this down to the local service station and have them drain the coolant / put in the sensor / refill (with me hovering around watching of course) :lol: Seems easy enough.... it's due for an oil change anyways....
Thread Starter
Le Mans Master
Joined: Jul 1999
Posts: 7,072
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From: Maryland
Re: Low Coolant (War Machine)
Yea seems easy enough but don't let your guard down for one minute. :rolleyes:
Le Mans Master
Joined: Aug 2000
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From: Airport Cruise-in 1 Veteran Airport Cruise-in 2 Veteran
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Re: Low Coolant (Juliet)
I've got this one mechanic at the local place pretty much trained to deal with me when I take the car in for an oil change or whatever.
