Top 20 1991 Chevrolet S-10 Blazer Questions & Answers

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It could be anywhere
But let it cool and fill with water see if you can see it leaking. If not fill it to top put cap back on and squeeze upper radiator hose to put pressure in system.
If you don't see anything it could be water pump

The heater resistor has probably gone out. It should be located in the blower housing.

I found this for 91.

Incorrect ignition timing or a lean fuel mixture, would be where I would start... Really Depends on engine make??

Have your motor mounts checked.

The fuel pump relay gets power from the ECM B fuse, and the relay should be on the firewall or the fender.

Could be the starter or a wiring problem. You could test for voltage at the starter with a meter or test light. A hair dryer or sunlamp would thaw out the starter if it is frozen.

I would check the connections & clean them 1st. If it doesn't try to turn over then, a hair dryer works for drying things.

When you flush your radiator, the heater core gets flushed as well. You will have to run the vehicle untill the heater is blowing hot air during the flush, that way its going through the thermostat. Empty the radiator as per normal and thats it.

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sounds like it got old. both of my vehicles are doing the same thing.

EGR valve sticking or bad vacuum leak, might be a place to start. I presume the ECM, control module are functioning properly?

run fault codes to determine why the CPU placed the engine in limp mode. Check oil and coolant levels.

Any where between 50 & 60 PSI

Depending on the transmission, most anything before 1990.

Very much so. The pressure regulator is designed to handle the OEM pressure. But, I'm confused with your story. A 1987 F150 with a 5.8 engine should have a carb, not fuel injection. The 6 cyl and 5.0 engines do use fuel injection. And, I only show inline fuel pumps for the fuel injected models in O'Reilly's book having 70-95psi. Nothing listed that would have 45psi. Are you sure about your numbers ?

Either you have a voltage drop to the starter, OR the starter needs to be shimmed as it might be to tight against the Ring Gear when engaging.

you will know if you are in 4wd if you take it on a dry road. you will feel it fighting you when you turn sharp.. as for the blinking lights . that's your truck saying..........please take me in for some servise

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