Check Coolant light on when cold

Tecknowolf · 09-14-2003, 01:04 PM

Ok, my roommate has a 1990 Mustang 5.0, the problem is this. Recently in colorado we have started to get into cold weather. Only when its cold out and his car is cold will the Check coolant light come on. What would be causing this, and is it an easy fix?

Appreciate any help.
Thanks guys

silver_pilate · 09-14-2003, 06:13 PM

Sometimes the coolant level sensor will crap out and send signals, but in your case, you probably just need to put more coolant in.

The sensor hangs from the top of the coolant overflow tank, and when the fluid level drops and the coolant dries off of the sensor, the "check coolant" light comes on. When your car is cold and there your coolant level is a little low, the sensor will dry and turn on the light. When you drive, the coolant level in the overflow rises as the fluid expands and wets the sensor, and it turns off. Does this to me all the time.

--nathan

Tecknowolf · 09-14-2003, 06:35 PM

I appreciate it alot. Thanks for the help.

09-14-2003, 01:04 PM	#1
Tecknowolf Registered Member Join Date: Sep 2003 Posts: 2	Check Coolant light on when cold Ok, my roommate has a 1990 Mustang 5.0, the problem is this. Recently in colorado we have started to get into cold weather. Only when its cold out and his car is cold will the Check coolant light come on. What would be causing this, and is it an easy fix? Appreciate any help. Thanks guys

09-14-2003, 06:13 PM	#2
silver_pilate DURKA DURKA!! Join Date: Sep 1997 Location: Lubbock, TX...(TX panhandle) Posts: 1,418	Sometimes the coolant level sensor will crap out and send signals, but in your case, you probably just need to put more coolant in. The sensor hangs from the top of the coolant overflow tank, and when the fluid level drops and the coolant dries off of the sensor, the "check coolant" light comes on. When your car is cold and there your coolant level is a little low, the sensor will dry and turn on the light. When you drive, the coolant level in the overflow rises as the fluid expands and wets the sensor, and it turns off. Does this to me all the time. --nathan __________________ '91 GT, Coast 347, 9.5:1 compression, full intake, Wolverine 1087 cam, exhaust, Keith Craft ported Windsor Jr. Irons (235 cfm intake, 195 cfm exhaust), AOD, PI 3500 converter, Lentech valve body, 3.73's (4.10's in the works), and Yokohama ES100's out back. Daily Car: '04 Infiniti G35 Sedan 6MT

09-14-2003, 06:35 PM	#3
Tecknowolf Registered Member Join Date: Sep 2003 Posts: 2	Thanks I appreciate it alot. Thanks for the help.

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