My GMC stopped running

Schurkey · Aug 10, 2023

meshal said:
it's running rich I will try to buy a repair kit for the throttle body.

HOW do you know it's "rich"? Is the O2 voltage too high?

meshal said:
Also, I want to change my electric fans to Yukon 2007+

Gotta be better than Subaru fans. Make sure the shroud doesn't block airflow at higher vehicle speed. Lots of shrouds have a rubber-flap or louver system that opens at higher speed, but is closed at low speed.

I've never been to Saudi Arabia. I'm suspicious of electric fans. I'd be reluctant to remove a properly-working fan clutch and fan in order to install an electric-fan system. But maybe things are different there. And at least the Yukon system is OEM-validated for a V8 engine.

Erik the Awful · Aug 11, 2023

meshal said:
Also, I want to change my electric fans to Yukon 2007+ because yesterday the gauge temperature went to 100c.

meshal said:
It goes up to 100c when I stop for a while.

An engine temp of 100°C (212°F) isn't crazy, especially when your ambient temperature is over 43°C (110°F), but you don't want it topping 104°C (220°F). Again, go oversize with your cooling system. You're not in danger of freezing temperatures, so a 70/30 mix of water and coolant will help.

It's normal for the temperature gauge to rise after you shut it off. The heat trapped in the engine block will transfer to the coolant as it dissipates.

meshal · May 6, 2024

Hi all, I've fixed the running rich issue and it's happened because there are 2 faulty spark plugs I've changed them.

(How did I know it was running rich because the RPM idling at 1500 also when I tried to adjust the timing to 0° it shut off.)

And about the electric fans, I've installed the Yukon 2007 fans and I did the wiring by myself I have faced some issues when the fans when the fan start it's hard to stop I think it's caused by the relay, and the wiring it's not that good but at least I tried, and then I faced issues with radiator, now someone is working on my truck to rewiring the fans and change the radiator.

Also, I've changed the thermostat to (180°F).

meshal · Jun 4, 2024

Hi all,

I want to ask if there is a better blower motor with a fan that fits in my truck (Yukon 1994) because the flow is not good enough at 43°C outside

Schurkey · Jun 4, 2024

meshal said:
I want to ask if there is a better blower motor with a fan that fits in my truck (Yukon 1994) because the flow is not good enough at 43°C outside

Do you mean a heater-ventilation-A/C blower motor and fan, or engine cooling fans like the rest of this thread involves?

If you're not getting sufficient airflow through the HVAC system and the motor isn't noisy, I'd be considering an A/C evaporator that's plugged with debris.

thinger2 · Jun 4, 2024

meshal said:
Hello all, I bought a used GMC Yukon 1994 350 TBI, and the previous owner installed electric fans with a 140 amps alternator, I am not sure about the alternator.

In the first week, I noticed that when I turned on the AC the battery gauge on the dashboard get down and the truck shuts off when I stop pressing the gas paddle.

Also, this week I noticed when the electric fans start at the second speed the battery gauge on the dashboard gets down and the truck shuts off when I stop pressing the gas paddle.

I'm thinking to upgrade the alternator to this one (WAI GLOBAL 8165NHO) 200 amps but do I have to upgrade anything else?

If there is anyone has a solution for this problem please help

Do you have sidepost mounted battery cables?
If you do have those cables,
Replace both of them.
I think you have bad connections at the battery or at the engine block or at the frame of the truck.
Clean all of the power and ground connections first.
The fan could be broken
But you have to be able to trust the wire going to the fan before you condemn it

My GMC stopped running

Schurkey

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Erik the Awful

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meshal

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