Outside temperature reading -40 and outside temperature sensor has been replaced

SOURCE: No ac

The ambient air temperature sensor is bad or has a connection/wiring problem. It is not blowing cold air because it thinks the outside air is less then 35degrees. When the computer sees outside air less than 35 it disables AC so that ice will not form inside the vehicle and in HVAC system. The sensor is directly behind the front grill. You might be able to check it for connection/corrosion/frayed or damaged wires. If no evidence of this I would replace it.

SOURCE: external temp reading is wrong... can it be reset?

i belive thats a default reading for that sensor replace it there cheep buy from dealer and locate it in front grill som times debris hit tese and mess them up simple repair probably only one screw holding it on

SOURCE: The compass and outside temperature display for

what could be the problem,its was working just fine.

Pete Sheppard

• 109 Answers
• Posted on Jan 27, 2010

SOURCE: 96 Chevy Silverado Timing

the traditional way of setting your timing would be better, get a loan of a timing light, the sticker under your hood should tell you the spec. usually 10-12 degrees btdc at idle with the timing advance disconnected. the timing advance is a tan wire with a black stripe usually found behind a plastic relay cover on the upper passenger side of the firewall near the distributor. there will be 3 plastic nuts holding the cover. you can mark the harmonic balancer tdc with liquid paper so it is easier 2 see with the light.

SOURCE: 1990 Chevy Blazer K5 5.7 engine: has engine ping

The temperature sensor is where I would start. If the sensor tell the computer that the engine is cold it will initiate the warm up mode which includes advancing the timing along with a rich fuel mixture. Unfortunately, there are many sensors that assist in controlling timing and fuel mixtures that it is difficult for me to give you a guaranteed solution.