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8 votes

Driving in 3rd gear what will it do to the transmission

Probably not. The engine is going to be running faster than normal to make highway speeds in 3rd, if she got going fast enough it was probably pretty loud. Depending on the vehicle there may be a rev ...
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  • 14.3k
6 votes

Why do you have to replace brake pads on both rear wheels at same time?

The only reason for replacing both at the same time is so that they brake evenly. This is more essential on the front of the vehicle. If you were to stamp on the brakes in an emergency, you wouldn't ...
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  • 20.9k
6 votes

Why do you have to replace brake pads on both rear wheels at same time?

There are two main reasons: So that both sides of the brake equation are equal. This means they are both starting at the same place again. When you purchase brake pads, they come in sets for both ...
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6 votes

What did I break and what do I need to replace?

You broke the knuckle. It's hard to say what else is damaged, but the knuckle, wheel bearing(s), hub (may be a single assembly) and lower ball joint need to be replaced. It may need the lower control ...
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  • 10.7k
6 votes
Accepted

Why does my van battery have three terminals, and how can I replace it?

If you do a search for a 78DT battery as on the label on your battery, you will find that it is a dual terminal battery. It has 4 poles, but one of the top ones in your photo has a cap on it. If the ...
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  • 20.9k
5 votes

Coolant pouring out from under 1998 GMC Yukon as fast as i put in

There are three places I can think the water would be flowing out of from the back area of the engine. The engine in your Yukon should be the GenI Small Block Chevrolet (SBC) engine (I believe they ...
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5 votes
Accepted

How do I fix my Heater & A/C in my car, suspect vacuum problem?

On the 97 Sonoma the controls are electronic and send a signal to a vacuum switch block which will send vacuum to various valves. This is from a corvette but is similar. While the switches on the ...
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  • 10.7k
5 votes

What did I break and what do I need to replace?

See Ben's answer for parts you likely damaged. In order to conduct this repair, the tools you will need are: large size (bigger than 15 mm, 1/2 inch drive) deep sockets 1/2 inch drive breaker bar (24 ...
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  • 12.1k
5 votes

What does this symbol on my dash mean? GMC W4500

That light indicates the Exhaust Brake feature is active and will work to slow the vehicle when your foot is taken off the accelerator. The picture is meant to be a throttle plate in the closed ...
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  • 13.2k
5 votes

12V power disappears, inexplicably comes back when measuring voltage across battery terminals

My experience with vehicles I have owned over the years with this case I would say dirty connections on main battery leads remove your battery connections clean the battery posts to a shiny metal ...
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4 votes
Accepted

I need to replace the female part that a headlight bulb fits into

H11 Bulb connectors are readily available from Ebay sellers, but will no doubt be available from an automotive shop. They usually come with short wires fitted, so you will need some way of connecting ...
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  • 20.9k
4 votes

brakes wont bleed after replacing lines from mc back 98 gmc jimmy

With that much line replaced, it's going to take some effort to bleed. Somebody has to sit and pump the brake, while somebody else works each bleeder nipple starting at the furthest from the MC (...
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  • 12.2k
4 votes

2007 Yukon XL issues in four wheel drive

As far as the 4wd thing goes, this is normal operation when on dry pavement. You are actually causing the transfer case to bind. This happens when the steering is hard over. The bind comes from the ...
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4 votes

GMC Yukon leaking coolant. Wondering where to look

If it is not obvious from where it is leaking, your best bet is to go on a car wash, and clean the engine as much as you can. Leave the car dry, fill up the coolant, and then try to replicate the ...
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  • 393
4 votes

Truck won't budge in neutral. Could it be due to a cracked transmission bellhousing?

The cracked bell housing would not be preventing the flywheel from turning as an automatic transmission doesn't work that way. The engine is not physically coupled to the transmission from a driven ...
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4 votes
Accepted

Odd yellow electrical connector (GM)

That orange thing is a lock. Pull it straight out and you can depress the tab. You see those and other style locks a lot on GMs.
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  • 10.7k
4 votes

2015 GMC truck check engine light no longer on

Yes, it is an accurate statement. The first troubleshooting step I do when diagnosing any issue which is in response to trouble codes is to clear the code and see if it comes back. If it doesn't come ...
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4 votes
Accepted

Correct placement of an aftermarket transmission cooler

Transmission fluid cannot be "too cold". There is one enemy of transmission fluid and that is heat. Having cooler temps in tranny fluid is a good thing. Your transmission isn't like your ...
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3 votes

How do I fix my Heater & A/C in my car, suspect vacuum problem?

Heck yeah! Short answer: Replace the check valve. Long answer: There is a check valve between the vacuum reservoir and the rest of the system. What that does is help the vacuum reservoir hold more ...
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  • 6,499
3 votes

My car will not start after being driven fine

But if it's my starter shouldn't I hear a noise Not if the starter solenoid is stuck. This is the piece of metal that connects the circuit and allows the starter motor to receive power. It's usually ...
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3 votes

Can I put 225/75R16 on a vehicle meant for 245/75R16?

As was pointed out, the outer diameter isn't quite the same, but it's not a major problem. The sole distinction I would be worried about would be load range. For example, an E350 van most likely wants ...
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3 votes

different tire ratios

Along with what @Zaid said, which I agree with, there are two other aspects to worry about: Antilock Brake System (ABS) Traction control (I'm not sure your Sierra has this, but it bears mentioning) ...
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3 votes

04 GMC Savanna G2500 4.8 V8 No Power

Make sure the cam and crank signals are good. Also check the reluctor for the crank and cam sensor.
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  • 251
3 votes

Truck overheating; no coolant flow through radiator

I'd agree with Paulster2 that you don't have enough coolant in the system. One thing I've found extremely helpful in getting cooling systems properly filled up is one of these Lisle 24610 Spill-Free ...
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3 votes

Trouble rewiring O2 sensor harness after dogs ate it

Here's what I found: (Zaid has a good answer, but sometimes on a four wire sensor the ground is floating inside the ECU [as with your Yukon] - which makes his "Step 2" not always reliable. Still, in ...
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  • 12.2k
2 votes

different tire ratios

Something to watch out for Since you intend to buy second-hand, one thing to watch out for is the age of the tire. From personal experience in desert climate, standard tires usually don't last beyond ...
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  • 39k
2 votes

2003 Yukon 5.3 with 278,000

I think I'd agree with you about the longevity of the current transmission. It sounds like it's slipping. A transmission shop might diagnose a bad solenoid or something which could be allowing the ...
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2 votes

different tire ratios

Since the vehicle is a rear-wheel drive, placing the larger wheels on the front would have the advantage of maintaining normal sized wheels on the driving axle. This means the drive-train is working ...
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  • 1,282
2 votes

Block Test: Can't suck any more air, is this normal? (1999 Suburban)

I would say that if the overflow tank only has a small hose from the over pressure nipple on radiator right under cap then that is normal and you should put the tester right on the radiator cap mouth, ...
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2 votes

Coolant leaking into engine

This should be what your engine oil cooler lines look like in the vehicle: If the oil leak was coming from the block (middle of the vehicle), part #1 should be what they changed to stop the leak. ...
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