1999 GMC Yukon Support Question
1999 GMC Yukon Support Question
Find answers below for this question about 1999 GMC Yukon.Need a 1999 GMC Yukon manual? We have 1 online manual for this item!
Question posted by zensumman on February 11th, 2014
Leaking From Radiator Or Radiator Hose?
Hello, I have a 1999 GMC Yukon 4wdrive that is loosing about a gallon of water a day in a slow leak. How can I determine if it is the radiator or a hose?
Current Answers
Answer #1: Posted by TexasDeviL on February 11th, 2014 2:34 AM
TexasDeviL
Member since:
December 27th, 2012 Points: 960,825
Member since:
December 27th, 2012 Points: 960,825
The only way is to get under the hood and/or under the truck and see where it is leaking while its running and warmed up so its circulating the coolant. The water pump is another possible source you should consider. A gallon a day is not a slow leak. You should see something getting wet. Look for signs of evaporated coolant around the thermostat housing, bottom of the water pump ,on both ends of both radiater hoses and check the heater hoses.
Also and I hate to mention it on the off chance that I'm somehow willing it into being true or something but while its running and has had time to get good and warmed up look at the tailpipe. If you see a trickle coming out or if the soot looks like water has run thru it and left a trail, thats an indication that the head gasket is blown or the head is cracked or both.
If you agree that the answer I provided is correct please remember to "accept" and/or mark it as "helpful" so I know I'm doing a good job. Thank you, I would really appreciate it.
[automotive mechanic and phone modding enthusiast]
Related Manual Pages
Owner's Manual - Page 1
...you when to perform vehicle maintenance and what to do if you want to read. i yellowblue
The 1999 GMC Yukon and Suburban Owner's Manual
1-1 2-1 3-1 4-1 5-1 6-1 7-1 8-1 Seats and Restraint Systems
This section...under different conditions. Service and Appearance Care
Here the manual tells you how to contact GMC for assistance and how to keep your vehicle.
Problems on page 8-10.
9-1
Index...
Owner's Manual - Page 253
... can start up even when the engine is not running and can injure you decide it cools down.
A. yellowblue
Cooling System (Gasoline Engine)
When you . Radiator Pressure Cap C.
Owner's Manual - Page 254
... before you run the engine if there is important that you may have a leak in the radiator hoses, heater hoses, radiator, water pump or somewhere else in the cooling system. NOTICE:
The coolant level should be very hot. NOTICE: (Continued)
CAUTION:
Heater and radiator hoses, and other engine parts, can be burned. If you do, you could cause...
Owner's Manual - Page 255
...system, premature engine, heater core or radiator corrosion may result. With plain water or the wrong mixture, your vehicle ...water and DEX-COOLR engine coolant at 30,000 miles (50 000 km) or 24 months, whichever occurs first. If it doesn't, your engine could be dangerous. Your vehicle's coolant warning system is doubled by the use of coolant other than DEX-COOL is added to be no leak...
Owner's Manual - Page 256
You can add the proper coolant mixture directly to the radiator, but be burned if you spill coolant on a hot engine. Coolant contains ethylene glycol and it .
5-14 Don't spill coolant on hot engine parts. When ...
Owner's Manual - Page 257
they can blow out and burn you badly. Wait for the cooling system and radiator pressure cap to turn the pressure cap.
5-15 even a little -- Never turn the radiator pressure cap -- They are under pressure, and if you ever have to cool if you turn the cap when the cooling system, including the...
Owner's Manual - Page 258
... cap when the cooling system, including the radiator pressure cap and upper radiator hose, is still some pressure left.
5-16 Turn the pressure cap slowly counterclockwise until it first stops. (Don't press down as you hear a hiss, wait for that to the Radiator
2. yellowblue
How to Add Coolant to stop. Then keep turning the...
Owner's Manual - Page 259
Put the cap back on the coolant recovery tank, but leave the radiator pressure cap off.
5-17 Fill the radiator with the proper DEX-COOLR coolant mixture, up to the COLD mark. 5. Then fill the coolant recovery tank to the base of the filler neck. (See "Engine Coolant" in the Index for more information about the proper coolant mixture.)
4. yellowblue
3.
Owner's Manual - Page 260
...sure the arrows on the pressure cap line up like this time, the coolant level inside the radiator filler neck may be lower. Start the engine and let it run until the level reaches ...more of the proper DEX-COOLR coolant mixture through the filler neck until you can feel the upper radiator hose getting hot. Then replace the pressure cap. yellowblue
6. At any time during this procedure if coolant ...
Owner's Manual - Page 281
... Fuel Container Checking Things Under the Hood Engine Oil (Gasoline Engine) Engine Air Cleaner/Filter (Gasoline Engines) Automatic Transmission Fluid Rear Axle Four-Wheel Drive Radiator Pressure Cap Thermostat Engine Coolant Power Steering Fluid Windshield Washer Fluid 6-30 6-34 6-35 6-42 6-43 6-51 6-51 6-54 6-55 6-58 6-59 6-60 6-65 6-67...
Owner's Manual - Page 290
Engine Oil Dipstick G. Engine Oil Fill K. B. E. Battery Air Cleaner Radiator Cap Coolant Recovery Tank Air Filter Restriction Indicator
F. Brake Fluid Reservoir L. Windshield Washer Fluid Reservoir M. Fan I. C. Power Steering Fluid Reservoir
J. D. Fuse/Relay Center
6-10 Automatic ...
Owner's Manual - Page 291
Brake Fluid Reservoir L. Automatic Transmission Dipstick H. Windshield Washer Fluid Reservoir M. E. Battery Coolant Recovery Tank Air Cleaner Radiator Cap Air Filter Restriction Indicator
F. Engine Oil Fill I. D. Power Steering Fluid Reservoir K. Engine Oil Dipstick G. Fuse/Relay Center
6-11 C. B. yellowblue "VORTEC" 7400 V8 Engine When ...
Owner's Manual - Page 293
... the oil is located on the driver's side engine valve cover. But you must use . This part explains what kind of the engine, near the radiator. For crankcase capacity, see "Capacities and Specifications" in the Index. Remove it enough to use the right kind. yellowblue
Checking Engine Oil
Pull out the...
Owner's Manual - Page 308
... unless you hear an unusual noise. Coolant contains ethylene glycol, and it . Never turn the radiator pressure cap --
When to Check Power Steering Fluid
It is not necessary to blow out and ...coolant on a hot engine. Add coolant mixture at the radiator. A fluid loss in the system or you suspect there is a leak in this system could indicate a problem. Don't spill coolant on hot...
Owner's Manual - Page 309
...When you will be operating your vehicle in the Index.
Windshield Washer Fluid
What to Use
To determine what kind of the reservoir clean, then unscrew the cap and wipe the dipstick with a clean...cap again and look at the FULL COLD mark. Always use the proper fluid can cause leaks and damage hoses and seals. If you need windshield washer fluid, be at the fluid level on the ...
Owner's Manual - Page 376
See "Engine Coolant" in taxi, police or delivery service. Pressure test cooling system and pressure cap. Clean radiator, condenser, pressure cap and neck. An Emission Control Service. Inspect hoses. An Emission Control Service.
j If you haven't used your vehicle under one or more of these conditions: - In heavy city traffic where the outside...
Owner's Manual - Page 387
...cap.
An Emission Control Service. DATE ACTUAL MILEAGE
SERVICED BY:
7-37 Inspect hoses. yellowblue
Long Trip/Highway Scheduled Maintenance -- Gasoline Engines
under severe service conditions ...therefore, haven't changed your automatic transmission fluid, change both the fluid and filter. Clean radiator, condenser, pressure cap and neck. j If you haven't used your vehicle under ...
Owner's Manual - Page 392
..." in the Index. Engine Cooling System Inspection
Inspect the hoses and have them replaced if they are inspections and services ...or other conditions which could cause a heat build-up , binding, leaks, cracks, chafing, etc.
7-42 Clean the outside of lubrication.... once. Look for damaged, loose or missing parts, signs of wear or lack of the radiator and air conditioning condenser. yellowblue...
Owner's Manual - Page 405
... available 24 hours a day, 7 days a week, 365 days a year, including weekends and holidays.
yellowblue Trip Interruption Assistance: GMC will provide assistance when you call is received:
D Vehicle Identification Number (VIN) D Name and home address D Telephone number and location from which you
are available to retail and retail lease customers operating 1999 GMC light duty trucks...
Owner's Manual - Page 410
... or credit card information to Helm, Incorporated (address below.)
CURRENT PUBLICATIONS FOR 1999 GMC
SERVICE MANUALS Service Manuals have the diagnosis and repair information on unit repair service ...RETAIL SELL PRICE: $15.00 Without Portfolio: Owner's Manual only. yellowblue
1999 GMC SERVICE PUBLICATIONS ORDERING INFORMATION
The following publications covering the operation and servicing of your...
Similar Questions
How To Take Off Plastic Cover For 1999 Yukon Ac Blower
(Posted by Nshjvald 10 years ago)
How To Get Plastic Cover Off Heater Fan Bloweron A 1999 Yukon Denali
(Posted by Robnester99 11 years ago)