Question about 1992 Toyota Pickup

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Heaters randomly blow cold, idle jump

The truck will heat up, and the heaters will start blowing hot heat, but then sometimes it will heat up and blow hot for a while, adn then just start blowing really cold air,and usually takes a while to start blowing hot air again, if at all that day. Also wether it is warmed up or not it will sometimes idle up to 2500 Rpm and then drop to 1000 Rpm, and then it will do that over and over, and it'll stop for a short bit and idle at 1000Rpm, and then it'll gradually go back up to 2500 Rpm and then start dropping and rising and dropping again. Also the Valve Cover Has Vacuum when its running, when i pull the oil cap off it, oil spits out and you can see pressure coming out, and it will start to idle rough.these problem could be all connected for all i kno It is a 1992 Toyota Pickup with the 22Re motor in it with about 180,000 Miles on it, it sat for about 2 years and then i purchased it, and put a new clutch in it, and it ran fine for about a year and now all these problems,

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  • phsyco105 Dec 30, 2008

    so it seemed like something was plugging the heater core, but it turns out all 3 problems were caused by a New thermostat that was also bad, it wasn't opening at all, so nothing was flowing through the system.

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Make sure your anti-freeze is full in the radiator.. If it is low, the heater is the first to go, but you wont see signs of overheating.. This I believe is also contributing to your idle fluctuation.

Posted on Dec 27, 2008

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http://howtobyme.blogspot.com/2011/11/engine-overheats-and-heater-blowing.html

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http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

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http://technoanswers.blogspot.com/2012/01/heater-blows-intermittently-and-temp.html

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http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

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http://technoanswers.blogspot.in/2012/02/heaterac-blower-motor-not-working-on.html

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