why does the temperature gauge show an overheating engine.

Asked by Oct 19, 2013 at 09:44 AM about the 1998 Chevrolet Monte Carlo 2 Dr LS Coupe

Question type: Maintenance & Repair

1998 monte carlo 3.1 L I have changed the temp sensor, water pump , thermostat &
radiator. Pressurized the coolant system and found no leaks. I have cabin heat. The
radiator fans run continuously as long as the engine is on. I purchased a supplemental
temp gauge and installed it by removing the block coolant drain plug and  installing the
sensor. Now I can see both gauges operate simultaneously.  The supplemental gauge
indicated that the engine is operating well within range whereas the factory gauge still
shows overheating. The service engine light stays on and the car won't pass inspection
.  Other codes have popped up : PO1001 MAF sensor circuit range/performance
problem & low input.  PO118 engine coolant temp circuit high input. PO171 system too
lean.  PO305 cylinder #5 misfire detected (I replaced injector now ok). The temp sensor
has three wires Yellow =PCM,  Black = ground, DARK GREEN = temp gauge. On the
plug (unplugged & cold engine) I get 6.85 vdc between yel & dk grn.  5.80 ohms
between blk & dk grn. The  NEW sensor tests out at 3050 ohms at 70 (F) . I am
thinking the dash gauge could be the problem. Has anyone had this problem?

1 Answer

66,305

I work at NAPA and we have problems with some of the aftermarket temperature sensors for GMs. Try an AC Delco sensor. That usually solves the problem. HTH. -Jim

Your Answer

Add photo

Related Questions

Search Chevrolet Monte Carlo Questions

Chevrolet Monte Carlo Experts

#1 Tom Demyan
Tom Demyan
Reputation 520
#2 Js08016
Js08016
Reputation 460
#3 John Saffrahn
John Saffrahn
Reputation 400
View All

Related Models For Sale

Used Chevrolet Camaro
226 Great Deals out of 30,943 listings starting at $1,217
Used Ford Mustang
470 Great Deals out of 45,735 listings starting at $1,999
Used Chevrolet Malibu
950 Great Deals out of 79,668 listings starting at $1,500
Used Pontiac Grand Prix
30 Great Deals out of 2,871 listings starting at $900
Used Chevrolet Corvette
119 Great Deals out of 20,753 listings starting at $3,000
Used Chevrolet Tahoe
547 Great Deals out of 29,234 listings starting at $1,699
Used Chevrolet Silverado 1500
1,717 Great Deals out of 175,751 listings starting at $1,250
Used Buick Regal
116 Great Deals out of 10,863 listings starting at $3,995
Used Pontiac Firebird
12 Great Deals out of 724 listings starting at $3,990

Used Cars For Sale

2007 Chevrolet Monte Carlo For Sale
3 Great Deals out of 121 listings starting at $2,995
2006 Chevrolet Monte Carlo For Sale
10 Great Deals out of 219 listings starting at $2,850
2005 Chevrolet Monte Carlo For Sale
4 Great Deals out of 148 listings starting at $2,995
2004 Chevrolet Monte Carlo For Sale
3 Great Deals out of 213 listings starting at $1,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.