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1990 chevy cheyenne c1500 4.3 v6

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Old Sep 28, 2022 | 8:37 PM
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Igotquestions's Avatar
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Default 1990 chevy cheyenne c1500 4.3 v6

I just have some questions on some things my truck is doing.
1. For the first 10 minutes (give or take) my truck runs a little hot but doesn't overheat. I have already replaced the thermostat.
2. My heater does not work it hasn't in a while, it does blow air though. The air it blows isn't cold and it isn't hot it's just what ever temp is outside. Also a/c doesn't work.

I'm just looking for solutions for those I just want it fixed before it actually gets cold here
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Old Sep 30, 2022 | 7:11 PM
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oilcanhenry's Avatar
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Originally Posted by Igotquestions
I just have some questions on some things my truck is doing.
1. For the first 10 minutes (give or take) my truck runs a little hot but doesn't overheat. I have already replaced the thermostat.
2. My heater does not work it hasn't in a while, it does blow air though. The air it blows isn't cold and it isn't hot it's just what ever temp is outside. Also a/c doesn't work.

I'm just looking for solutions for those I just want it fixed before it actually gets cold here
Do you have missing coolant and have to add some? Any leaks on the floorboard or ground? If not, I'd pull the heater hoses off the firewall and flush them out real good. Maybe some coolant cleaner would help. If you don't see any coolant on the ground or in the vehicle, you may have a head or intake gasket leak, so the coolant goes out the exhaust. Some Alumaseal MIGHT help, if so, and it's a small leak.

The A/C has almost nothing to do with your heater, as it uses a special refrigerant to operate, whereas your heater operates by the engine coolant, which you likely knew already. Both the A/C Evaporator and the heater core are located in your climate control box, under the dash. Under-dash repairs are quite expensive, since the auto-tech will have to remove the climate control box to have access to both.

You can see if you have any refrigerant left by pushing the high or low side Schrader valve in, engine off. If it's out of refrigerant it will not operate, as the A/C unit has a low-pressure sensor,and you have a leak somewhere. If you let it go on without repair, corrosion will eventually set in and cost you even more money to repair, as atmospheric oxygen/nitrogen/moisture do not belong in any A/C unit at all.
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