Temp Gauge - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Claytona08 · 03-26-2014, 08:50 AM

Hey guys, I drained all the fluid out of my radiator because it was real dirty and brownish and the gasket was bad on the thermostat so I decided to replace the thermostat and put new fluid in the radiator. When I am driving the truck runs approx. 180-190 degrees but from time to time (mainly when I am coming to a stop) the temp jumps up to 260 degrees. I push in the clutch and rev up the engine and it jumps back down to normal temperature. What could be causing this?

**Palf70Step** · 03-26-2014, 04:35 PM

Are you running a fan shroud?

Sounds like at rest your not getting the air to pull thru the radiator.

Claytona08 · 03-26-2014, 04:40 PM

Quote:

Originally Posted by Palf70Step

Are you running a fan shroud?

Sounds like at rest your not getting the air to pull thru the radiator.

It's all stock. Are you talking about the aftermarket fans that mount to the radiator?

**Palf70Step** · 03-26-2014, 06:40 PM

No I meant the factory one that fits behind the radiator and wraps around the fan

Claytona08 · 03-26-2014, 06:49 PM

Oh ok, yeah my truck has that.

donut · 03-26-2014, 07:07 PM

Fan clutch failed? Or maybe an air bubble?
Throwing out suggestions.

Chevy3+3 · 03-26-2014, 11:37 PM

Bad water pump? Maybe the impelled is trashed and only flows enough when at a higher RPM or moving. Also check your thermostat. It may be sticking?

Claytona08 · 03-27-2014, 08:55 AM

Someone suggested that I start by loosening up my radiator cap and driving for a short time. If that didn't fix it then have Autozone check my cap and or replace it. Then look into changing out my water pump.

Dead Parrot · 03-27-2014, 09:56 AM

I would double check that the temp gauge is reading correctly first.

How many blades does your fan have? IIRC some have 5 and other have 7.

How quickly does the temp rise at idle?

Chevy3+3 · 03-27-2014, 11:21 AM

Several years ago I bought a radiator cap with a built in temp gauge in it. That way I can double check my temp and compare to my gauge. It has come in very handy.

Claytona08 · 03-27-2014, 11:35 AM

Quote:

Originally Posted by Dead Parrot

I would double check that the temp gauge is reading correctly first.

How many blades does your fan have? IIRC some have 5 and other have 7.

How quickly does the temp rise at idle?

Not sure how many blades it has. I can check it this evening. It takes it some time before the temperature rises to 180 degrees. Maybe 5 or so minutes into driving, not sure about idle.

Quote:

Originally Posted by Chevy3+3

Several years ago I bought a radiator cap with a built in temp gauge in it. That way I can double check my temp and compare to my gauge. It has come in very handy.

Sounds like a very good idea.

motornut · 03-27-2014, 12:31 PM

you mention real dirty and brownish...
any chance it's fluid was mixed green and red?
could it have a stop leak in there?

Claytona08 · 03-27-2014, 12:46 PM

Quote:

Originally Posted by motornut

you mention real dirty and brownish...
any chance it's fluid was mixed green and red?
could it have a stop leak in there?

The water looked rusty. The truck sat for 10 months prior to me buying it without ever being started.

motornut · 03-27-2014, 03:20 PM

Quote:

Originally Posted by Claytona08

The water looked rusty. The truck sat for 10 months prior to me buying it without ever being started.

oh ok good,couldn't do that here,it would crack,did it clear up?
anything but a nice bright green I'd reflush it

Claytona08 · 03-27-2014, 04:02 PM

Quote:

Originally Posted by motornut

oh ok good,couldn't do that here,it would crack,did it clear up?
anything but a nice bright green I'd reflush it

Yeah I drained it and filled it back up with half and half

03-26-2014, 08:50 AM	#1
Claytona08 Registered User Join Date: Mar 2013 Location: Silsbee Tx. Posts: 880	Temp Gauge Hey guys, I drained all the fluid out of my radiator because it was real dirty and brownish and the gasket was bad on the thermostat so I decided to replace the thermostat and put new fluid in the radiator. When I am driving the truck runs approx. 180-190 degrees but from time to time (mainly when I am coming to a stop) the temp jumps up to 260 degrees. I push in the clutch and rev up the engine and it jumps back down to normal temperature. What could be causing this? __________________ http://67-72chevytrucks.com/vboard/s...d.php?t=580955 http://youtu.be/JYoQJYTXKqI 1984 Chevrolet Scottsdale C10 "Project Platinum C10" 1971 Chevrolet Chevelle "Project Car"

03-26-2014, 04:35 PM	#2
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,216	Re: Temp Gauge Are you running a fan shroud? Sounds like at rest your not getting the air to pull thru the radiator. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

03-26-2014, 06:40 PM	#4
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 47,216	Re: Temp Gauge No I meant the factory one that fits behind the radiator and wraps around the fan Attached Images __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

03-26-2014, 06:49 PM	#5
Claytona08 Registered User Join Date: Mar 2013 Location: Silsbee Tx. Posts: 880	Re: Temp Gauge Oh ok, yeah my truck has that. __________________ http://67-72chevytrucks.com/vboard/s...d.php?t=580955 http://youtu.be/JYoQJYTXKqI 1984 Chevrolet Scottsdale C10 "Project Platinum C10" 1971 Chevrolet Chevelle "Project Car"

03-26-2014, 07:07 PM	#6
donut Registered User Join Date: Aug 2009 Location: S.C. Posts: 1,593	Re: Temp Gauge Fan clutch failed? Or maybe an air bubble? Throwing out suggestions. __________________ '86 C-30 dually, 454/tbh400 '73 K-20 350/350/205 (sold ) I'm kinda like duct tape- no real purpose, but handy to have around.

03-26-2014, 11:37 PM	#7
Chevy3+3 Registered User Join Date: Oct 2013 Location: Winfield KS Posts: 489	Re: Temp Gauge Bad water pump? Maybe the impelled is trashed and only flows enough when at a higher RPM or moving. Also check your thermostat. It may be sticking?

03-27-2014, 08:55 AM	#8
Claytona08 Registered User Join Date: Mar 2013 Location: Silsbee Tx. Posts: 880	Re: Temp Gauge Someone suggested that I start by loosening up my radiator cap and driving for a short time. If that didn't fix it then have Autozone check my cap and or replace it. Then look into changing out my water pump. __________________ http://67-72chevytrucks.com/vboard/s...d.php?t=580955 http://youtu.be/JYoQJYTXKqI 1984 Chevrolet Scottsdale C10 "Project Platinum C10" 1971 Chevrolet Chevelle "Project Car"

03-27-2014, 09:56 AM	#9
Dead Parrot Registered User Join Date: Aug 2012 Location: Oklahoma City, OK Posts: 2,611	Re: Temp Gauge I would double check that the temp gauge is reading correctly first. How many blades does your fan have? IIRC some have 5 and other have 7. How quickly does the temp rise at idle?

03-27-2014, 11:21 AM	#10
Chevy3+3 Registered User Join Date: Oct 2013 Location: Winfield KS Posts: 489	Re: Temp Gauge Several years ago I bought a radiator cap with a built in temp gauge in it. That way I can double check my temp and compare to my gauge. It has come in very handy.

03-27-2014, 12:31 PM	#12
motornut 78K & 79C Jimmys Join Date: Nov 2009 Location: Ottawa Ont CANADA Posts: 7,901	Re: Temp Gauge you mention real dirty and brownish... any chance it's fluid was mixed green and red? could it have a stop leak in there? __________________ John 1978 GMCJimmy4X4-350/203 1979 GMCJimmy4X2-305/350



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