I haveva coolant leak in my 2001Gmc jimmy how do I no were the problem is

SOURCE: whats the easiest way to change afuel pump in a

There is no easy way, you have to drop the fuel tank. It's inside there. Note: gasoline weighs about 7 pounds a gallon, so siphon out as much as you can.

Joe Taylor

• 2229 Answers
• Posted on Nov 26, 2011

SOURCE: 2001gmc jimmy starts and stalls security light stays on

The security light has one job, it warns you that there is a "break" or "miscommunication" in your antitheft system. This is why the Jimmy keeps stalling. The antitheft system cuts the power to the injectors (It's thinking it is protecting itself from theft) and the vehicles stalls in 5 seconds or less after starting. They are also known to stall while driving. Followed by the security light. The SECURITY light will either flash or stay on solid. A solid light normally indicates a bad Theft Deterrent Module, this is the brain of the whole system. Go to this link, it has alot of info stuff that should help you out.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

SOURCE: 2001gmc jimmy the heater does not heat full capacity even when the vehicle has ran for more then an hour

The most common cause for that is the engine thermostat being stuck in the open position. A new thermostat and gasket is less than $20. Other things can cause it, though. Check the coolant level in the radiator and the reservoir when the engine is COLD, and top-off if needed. Your temperature control lever cable for the mode doors may not be working properly or may be disconnected. I'm not sure about your particular vehicle, but some have a heater control valve under the hood to control the coolant flow to the heater core. It would be located by the firewall, and would have a heater hose attached to it, and have another hose entering the firewall.