1994 Chevy S10 2.2 L LS pickup-no heat or ac and sounds like a fast sewing machine

Question

1994 Chevy S10 2.2 L LS pickup with rebuilt engine with new thermostat and new radiator. Replaced EGR, fuel filter, and gas cap. Idles loudly like a fast sewing machine. No heat or cool - fan blows. What could be the problem?

Answer 1

I will need more info but here is what I can say.

for the heater

• you will need to check to see if the heater core was hooked back up plugged or bypassed.
• I am assuming you let the engine warm up while testing the heater.
• It is less likely that they unhooked the push pull cable to the heater cores valve. it may be a coincidence but this could have also broke.

for the AC there could be a few things

• did they put the ac pump back
• did they put the ac radiator back
• if they unhooked anything did they purge the system and refill it with proper refrigerant
• did they put the pumps belt on
• did they hook up the switch wire
• is there now a leak in the system somewhere
• I am assuming this isn't where the sewing machine sound is coming from if it is you might not have the proper refrigerant / coolant in it

the sewing machine sound

• can you upload some audio?
• you are sure it is getting enough oil pressure
• new dual or triple valve springs can make noise as they wear in. Not sure if you have these though. below is a picture

until we can hear a recording of it we probably won't be able to pinpoint what the noise might be.

all the dual and tripple springs can have a tight fit causing them to rub on eachother until they are broken in. as they do this they will make a very distinct noise.