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Username Post: Truck is overheating        (Topic#352912)
panthersl56 
Poster
Posts: 23

Reg: 04-05-14
09-08-18 11:02 AM - Post#2745655    

Truck was giving me problems overheating and reducing power, changed out the thermostat, water pump, fan clutch, coolant sensor and coolant sensor wires. Truck still overheats but I’m sure it’s not. When I start it in the morning it immediately starts to overheat and reduce power. Changed out the belt too. Once I drove for a while it reduces power and computer tells me it’s overheating and not overheating and my gauge goes up and down with no set tempature, any ideas? Going to flush the radiator today



 
2plus2 
Member
Posts: 1168

Loc: Mission,BC
Reg: 02-03-05
09-08-18 12:15 PM - Post#2745662    
    In response to panthersl56

When you start it in the morning and it instantly overheats,what is instant? A few seconds?5min?

69 Canadian Pontiac 2+2
factory L48 350 Chev,TH350,PW,PT
99 Silverado RCLB 4.8 NV4500 14BSF 4.10's locker 6" Procomp 35 bfg m/t's 9k winch cutout flares
07 Town Car Loaded,Tinted,Getting Bagged


 
panthersl56 
Poster
Posts: 23

Reg: 04-05-14
09-08-18 01:24 PM - Post#2745665    
    In response to 2plus2

Few seconds



 
2plus2 
Member
Posts: 1168

Loc: Mission,BC
Reg: 02-03-05
09-08-18 03:27 PM - Post#2745675    
    In response to panthersl56

What motor are we dealing with?

69 Canadian Pontiac 2+2
factory L48 350 Chev,TH350,PW,PT
99 Silverado RCLB 4.8 NV4500 14BSF 4.10's locker 6" Procomp 35 bfg m/t's 9k winch cutout flares
07 Town Car Loaded,Tinted,Getting Bagged


 
wagonman100 
Super Senior Member
Posts: 14071
wagonman100
Loc: Baltimore, MD
Reg: 11-27-04
09-08-18 05:37 PM - Post#2745686    
    In response to 2plus2

It takes a while for the engine to build up heat from cold, so it can’t immediately overheat. I’m not familiar with how the computer reads the temp. to determine overheating. You said you changed the sensor and wiring. What about the sending unit for the gauge? You could also have a steam pocket in the cooling system. This can give false readings to sensors and sending units. Do you have good heat in the truck? I know you haven’t probably been running the heat, but no heat is a good indicator of a steam pocket. Running the truck with the radiator cap (overflow bottle cap) off and revving the engine to about 3,000 RPM can help clear an air pocket. If the truck lets you rev it that high on reduced power.

Jay
Friends don’t let friends drive Fords.

1999 Silverado Z71 4X4 extra-cab short bed
1983 Malibu Fauxmad - tubbed
1978 El Camino Kustomized
1972 Monte Carlo
1957 210 handyman wagon
1957 Nomad sport wagon
1957 Cameo Carrier


 
panthersl56 
Poster
Posts: 23

Reg: 04-05-14
09-08-18 07:22 PM - Post#2745691    
    In response to 2plus2

6.0l gas



 
panthersl56 
Poster
Posts: 23

Reg: 04-05-14
09-08-18 07:23 PM - Post#2745692    
    In response to wagonman100

I have no steam pocket, and haven’t checked sending unit



 
panthersl56 
Poster
Posts: 23

Reg: 04-05-14
09-08-18 07:23 PM - Post#2745693    
    In response to wagonman100

Truck does let me rev it that high but when I drive it gives me a stutter like it’s a misfire and my gauge goes crazy



 
2plus2 
Member
Posts: 1168

Loc: Mission,BC
Reg: 02-03-05
09-08-18 07:38 PM - Post#2745694    
    In response to panthersl56

What happens to the guage when you turn the key on but you dont start it?


69 Canadian Pontiac 2+2
factory L48 350 Chev,TH350,PW,PT
99 Silverado RCLB 4.8 NV4500 14BSF 4.10's locker 6" Procomp 35 bfg m/t's 9k winch cutout flares
07 Town Car Loaded,Tinted,Getting Bagged


 
panthersl56 
Poster
Posts: 23

Reg: 04-05-14
09-08-18 10:27 PM - Post#2745696    
    In response to 2plus2

Stays like stock but once I start it, it goes up or sometimes stays cool



 
jktucker92 
Silver Supporting Member
Posts: 219
jktucker92
Reg: 02-05-17
09-12-18 06:36 AM - Post#2745962    
    In response to panthersl56

Check your grounds thoroughly. Electrical sensors can get an incorrect signal if the engine isn't properly grounded. Often causes other weird problems too. As mentioned above, even under the worst conditions, an engine can't overheat in seconds, so it must be an incorrect reading of some sort. Possibly a issue with the ECM.



 
junkman104 
Frequent Contributor
Posts: 1251

Age: 59
Loc: Murphy N.C.
Reg: 01-25-14
09-12-18 04:27 PM - Post#2745992    
    In response to jktucker92

You never shared what year it is or I missed it. The clusters on 03-6 GM's have a problem with stepper motors going bad. Do you have a scan tool that shows data? See what the ecm shows as far as engine temperature.



 
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