Gauge play

Foxmoto28 · May 10th, 2010, 10:44 PM

So recently I've been thinking the stang has been overheating but haven't been smelling any anti-freeze or anything. Now I'm thinking it's electrical. The other night I was driving to a restaurant and noticed it playing games. It would go from cold to hot (like normal) and then it would go down to halfway and then back to hot and then cold, back and forth.

Am I looking into something horrible?

How can I fix this and what are things to look for to make sure that my car isn't actually overheating?

1994 5.0 Coupe GT

redturbo5.0 · May 10th, 2010, 11:01 PM

first i would check to see if your thermostat is working properly. then check your radiator cap or just replace it if not sure

mutlyi4 · May 11th, 2010, 09:31 AM

get an infrared thermometer (can get one at sears for like $30) and check the engine temp at the thermostat and the coolant temp sensor and compar to your gauge if it matches you have a problem if not its just the gauge being off maybe the cts or the gauge

Bullitt95 · May 11th, 2010, 12:39 PM

Sounds to me like the gauge sending unit is on the fritz.

Red95_5Oh · May 11th, 2010, 07:01 PM

yeah mine is doing the same thing...

Foxmoto28 · May 14th, 2010, 11:25 PM

Originally Posted by redturbo5.0

first i would check to see if your thermostat is working properly. then check your radiator cap or just replace it if not sure

My dad told me to take a flame to the thermostat to see if it opened up; guess they used to do that it they don't anymore. Would the one on my car do this? Or is that just old and outdated?

mutlyi4 · May 15th, 2010, 09:43 AM

should work but i use boiling water so as not to take a chance on damaging the thermostat

Red95_5Oh · May 16th, 2010, 11:39 AM

Quick question. Where should my thermostat needle be? I do believe my sender unit is messed up. It moves from just above cold to around O. I just changed my water pump hoses and thermostat.

mustangbrad94gt · May 19th, 2010, 04:34 AM

our temp gauges are known for problems, accuracy is + or- 20 degree's at best, I switched to a autometer electric 4337 at 50 bucks, spot on accurate

Mustang68 · May 19th, 2010, 05:47 AM

Originally Posted by Bullitt95

Sounds to me like the gauge sending unit is on the fritz.

agreed.. that or his wiring shorting out somewhere...

Foxmoto28 · May 21st, 2010, 10:59 PM

It was that sending unit, thanks guys.

May 10th, 2010, 10:44 PM	#1
Foxmoto28 Regular '94 GT Coupe Join Date: Feb 2010 Posts: 281 iTrader: 0 reviews	Gauge play So recently I've been thinking the stang has been overheating but haven't been smelling any anti-freeze or anything. Now I'm thinking it's electrical. The other night I was driving to a restaurant and noticed it playing games. It would go from cold to hot (like normal) and then it would go down to halfway and then back to hot and then cold, back and forth. Am I looking into something horrible? How can I fix this and what are things to look for to make sure that my car isn't actually overheating? 1994 5.0 Coupe GT

May 11th, 2010, 12:39 PM	#4
Bullitt95 Hardcore Enthusiast 1995 Mustang GT auto 13.546 @ 105.32 Join Date: Apr 2007 Location: Al Ain, UAE Posts: 1,452 iTrader: 0 reviews	Sounds to me like the gauge sending unit is on the fritz. __________________ 243.5rwhp/284.2rwtq Mod list in My Garage

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May 10th, 2010, 11:01 PM	#2
redturbo5.0 Regular 1994 Mustang GT vert Join Date: Apr 2010 Location: South Texas Posts: 54 iTrader: 0 reviews	first i would check to see if your thermostat is working properly. then check your radiator cap or just replace it if not sure

May 11th, 2010, 09:31 AM	#3
mutlyi4 Regular 95 mustang gt ??? Join Date: Feb 2010 Location: florida Posts: 122 iTrader: 0 reviews	get an infrared thermometer (can get one at sears for like $30) and check the engine temp at the thermostat and the coolant temp sensor and compar to your gauge if it matches you have a problem if not its just the gauge being off maybe the cts or the gauge

May 11th, 2010, 07:01 PM	#5
Red95_5Oh Regular 1995 GT 4Ever Join Date: Apr 2010 Location: C Town Posts: 170 iTrader: 0 reviews	yeah mine is doing the same thing...

May 15th, 2010, 09:43 AM	#7
mutlyi4 Regular 95 mustang gt ??? Join Date: Feb 2010 Location: florida Posts: 122 iTrader: 0 reviews	should work but i use boiling water so as not to take a chance on damaging the thermostat

May 16th, 2010, 11:39 AM	#8
Red95_5Oh Regular 1995 GT 4Ever Join Date: Apr 2010 Location: C Town Posts: 170 iTrader: 0 reviews	Quick question. Where should my thermostat needle be? I do believe my sender unit is messed up. It moves from just above cold to around O. I just changed my water pump hoses and thermostat.

May 19th, 2010, 04:34 AM	#9
mustangbrad94gt Newbie Join Date: May 2010 Posts: 43 iTrader: 0 reviews	our temp gauges are known for problems, accuracy is + or- 20 degree's at best, I switched to a autometer electric 4337 at 50 bucks, spot on accurate

May 21st, 2010, 10:59 PM	#11
Foxmoto28 Regular '94 GT Coupe Join Date: Feb 2010 Posts: 281 iTrader: 0 reviews	It was that sending unit, thanks guys.

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