93 Pickup 22RE Temp Gauge Stays on cold. No Heat. High Idle
#1
93 Pickup 22RE Temp Gauge Stays on cold. No Heat. High Idle
Im thinking this is a bad thermostat but wanted to confirm before I ripped this thing apart in the cold. Here are the symptoms : After running for 20 mins, No heat, temp guage stays on cold, high idle for duration of trip(in the summer too). Im thinking this all relates to a bad thermostat.... Could anything else cause these symptoms?
#3
#5
Yea possible thermo. Thats the easiest part replacement type deal. I'd say replace it with a "Toyota" one like "shaeff" said. Check coolant and ad as neccesary. High idle is another issue on its own. Fix t-stat first then we will talk about your idle. The engine not warming up quick enough could cause the high idle due to the computer going "wtf heat up already"
#6
I almost 100% sure that is the thermostat issue because I got that exactly same problem then gone after I replaced the thermostat. The high idle because the O/D is not working at all. The O/D is related directly with the temp.
#7
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To the OP-
Yes, some thermostats are designed to fail-open. However some don't fail "fully" open meaning that they allow coolant to flow to help prevent overheating but they also don't allow full flow. Now, depending on where you are, a failing fan clutch could over-cool the coolant in the radiator, and if both fail at the same time, you would be hard pressed to get warm even at idle since the fan clutch would not be releasing and would be pulling substantial air over the radiator even when unnecessary.
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#8
The computer only responds to sensor inputs and does not control the idle speed. The high idle would be caused by the IAC/AAV not closing properly thus allowing air to bypass the throttle body, which would be due to the cold coolant; and the ECU would keep the fuel mixture rich in accordance with the feedback from coolant temperature sender- basically the truck would be stuck in a cold-start loop of sorts and not enter closed-loop mode.
#9
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The computer only responds to sensor inputs and does not control the idle speed. The high idle would be caused by the IAC/AAV not closing properly thus allowing air to bypass the throttle body, which would be due to the cold coolant; and the ECU would keep the fuel mixture rich in accordance with the feedback from coolant temperature sender- basically the truck would be stuck in a cold-start loop of sorts and not enter closed-loop mode.
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