Heater control valve.
12-28-2010, 05:46 PM
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Heater control valve.
Does anyone know what would cause a heater control valve not to open freely? I replaced my climate control module the other day and had heat for a bit, but after hitting the A/C button to test the A/C system the HCV is stuck closed. Right now I've got the wire off of the valve and I'm operating it manually to adjust my temps. It moves quite easily, so I don't believe it is stuck, but I don't have the tools to do a vacuum test.
Sidenote: Before I replaced the module the heat would work intermittently when it wanted to, but that was due to a faulty climate control module. I do know that the ST162 had specific problems with the electrical unit --which is what I have-- and because of this Toyota used it in one 86 trim model, all models in 87, and then in 88 and 89 they were back primarily to manual sliders with just a few electrical units. The problem it suffered from was that soldered posts often cracked, causing a break in the circuit; however, I went over the circuits with a magnifying glass and couldn't find any breaks.
Sidenote: Before I replaced the module the heat would work intermittently when it wanted to, but that was due to a faulty climate control module. I do know that the ST162 had specific problems with the electrical unit --which is what I have-- and because of this Toyota used it in one 86 trim model, all models in 87, and then in 88 and 89 they were back primarily to manual sliders with just a few electrical units. The problem it suffered from was that soldered posts often cracked, causing a break in the circuit; however, I went over the circuits with a magnifying glass and couldn't find any breaks.
12-28-2010, 05:49 PM
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Re: Heater control valve.
Does anyone know what the symptoms a faulty heater relay would cause? I currently don't have a voltmeter and can't afford one at the moment.
12-28-2010, 05:55 PM
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Re: Heater control valve.
I'll check on this when I get a chance. If it's the cable I may just stick with the manual thing. It's hard to keep up on a car that's 23 years old and requires nippondenso parts.
Does anyone know what the symptoms a faulty heater relay would cause? I currently don't have a voltmeter and can't afford one at the moment.
Does anyone know what the symptoms a faulty heater relay would cause? I currently don't have a voltmeter and can't afford one at the moment.
12-28-2010, 06:31 PM
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Re: Heater control valve.
Alright, was just wondering if the relay would prevent the temperature slider from working. It looks a lot like a brake cable on a bike, so I'm guessing that white lithium grease will do it? I still have my console ripped apart, so tracing the cable back shouldn't be much work (I hope). I don't have the time to tear out the actual heater assembly with everything I'm trying to get done.
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