20 Most Recent 1995 GMC Sierra C1500 - Page 7 Questions & Answers

Take it to an Autozone, they have a code scanner and will run it for free.

sounds like your hot water by-pass valve is stuck open

First thing I would look for is a vacuum line leak. Engine heat can make lines brittle or something like fuel or oil on lines not made for it will weaken those lines causing cracks, breaks, etc. Also a line could just not be connected (knocked loose during maintenance and missed). Sometimes these will affect performance but not always, and you didn;t mention anything other noticed issues. I'd check all hose connections of any kind as well.

Call manufacturer give them car ID after proper check they will send you the key code for a locksmith

Something is wrong with the float or the sending unit.Did anyone replace the fuel pump lately.

yes, they have been inside for a long time,

i dont know what you mean, if you are tying to put a toggle switch in then run one wire from the fan to a ground on the truck and a wire from the toggle to the fan you will also need a hot wire from the battery to the toggle with a fuse inbetween, but the first thing you want to check is make sure the fuses and the relay are good and you have no broken wires if they are good then hook up a neg- and a pos+ wire to the fan if it comes on the change the temp sensor and the fan should work on its own when the truck gets hot

Throttle position sensor