Engine 1993 Running cool

Sconnell80

Member
Aug 19, 2018
53
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Western NY
I’ve got a 1993 GT that I’ve picked up and have been going through fine tuning it as it was someone else’s project. I’ve noticed that the temp gauge runs around the 150* mark most times unless it sits and idles for 30mins in 90* weather. It has an aluminum 3 row radiator with electric contour fans that are set to run at 185* and they do kick on at about the temp by the dash gauge. I know the gauges in these cars suck but it seems to be somewhat right. I will get a temp gun and shoot it and see what it says. It’s starting to cool down here in western NY so I’d like to get some heat lol.
 
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Sconnell80

Member
Aug 19, 2018
53
2
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Western NY
I’m guessing it’s gonna read low as well cause I don’t get much heat out of the heater. What should I look at next if the temp is low. Easier to diagnose it if it was overheating lol.
 

Boostedpimp

15 Year Member
May 8, 2003
1,330
508
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NJ
visually verify that your heater core isn't bypassed and maybe there is a low thermostat installed. Factory was 195 I believe but putting a 180 in is popular to help with keeping cool in hot weather and generally sucks in the winter time heat wise.
 
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Sconnell80

Member
Aug 19, 2018
53
2
8
41
Western NY
Yes the heater core is hooked up as I get heat if I let it sit and idle but once I start moving temps drop. I put in a 180* tstat so maybe I’ll try a 195*.
 

Mustang5L5

Put lubricant all over the balls
Mod Dude
Feb 18, 2001
37,336
13,168
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Massachusetts
I'd try the 195* and see if oyu can buy a cheap temp gauge to install and confirm the low temp. The stock gauges are notoriously inaccurate. Try cleaning the connector on the temp sender or replacing it completely as it's pretty cheap. Any oxidation can increase resistance making the reading incorrect
 

2000xp8

SN Certified Technician
Aug 8, 2003
7,255
1,267
194
NJ
150 is crazy low.
Likely not a real reading in 90 degrees.
If it has a 180 in it, the t stat shouldn't open until it hits that temperature, so regardless of the size radiator you have, the car should run at least 180 degrees.

My guess is that your gauge reading is way off, so i'm with mike, don't mess with anything until you put a real gauge on it.
 

Sconnell80

Member
Aug 19, 2018
53
2
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41
Western NY
The thermostat is brand new and it is working, I can grab the hose while the car is warming up and it is cooler to the touch, check it maybe 10 mins later and it’s hot. I’ve got another temp sensor coming just to see, I’ll grab a temp gun and try and get some readings to verify. My guess is the gauge is off or not reading right at certain temps.
 

Sconnell80

Member
Aug 19, 2018
53
2
8
41
Western NY
Put in new temp sending unit and it reads just shy of the middle of the temp gauge. Atleast it’s not reading on the low end so I can live with that. Fans come on just above the middle.
 
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