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Toyota Previa recharge / AC Faulty Help Please

540itouring on Sun June 07, 2009 1:30 PM User is offline

Country of Origin: United Kingdom

Hi , i have a 96 toyota previa that was worink for the last 18 months untill the gas was low. On testing the system was empty so was tested with ofn and no leaks found. The system was vacced out for 30 mints and hel vacuume ok and added a small ammount of pag oil but when r134 connected and low side mamifold guage opened i noted no flow of gas into system with engine off. The high side of manifold valve was then opened again with engine off and 70 grams approx flowed in to system but that was all that would go in. The bottle was warmed but again no more flow. The high valve on manifold was then closed with low valve still opened and engine started. The compressor cuts in and stays on but will not suck any more gas into the system. The low reading is high and the high reading is low , the output pipe on the compressor is hot and also the pipe feeding upto the condenser is hot but condenser is cold. The sight glass at the front shows some gas flow of mostly liquid form. The high pressure pipe upto the expantion valve gets cold and the low pressure return from evaporator is slightly warm. I would like any advice on what the problem will be down to please.

The condenser and filter dryer was replaced 2 years ago . What would cause the condenser to no heat up ? would a blocked expantion valve give these symptons ? I have some pics of manifold readings with engine of and on and i know this is low on gas but to me it looks like i have a blockage somewhere in the system ?

Thanks for your help in advance

Edited: Sun June 07, 2009 at 6:06 PM by 540itouring

540itouring on Sun June 07, 2009 6:00 PM User is offline

What would the symptons be of a blocked filter dryer be ? The fact that the feed to the condenser from compressor is hot and pipe to the expansion valve is colder with system on i was thinking that the blockage must be between the two pipes ? Would a blocked filter dryer or expansion valve prevent charging via the low side ??



Please advise on this. Thanks

Chick on Sun June 07, 2009 10:13 PM User is offlineView users profile

It appears that the low side coupler is NOT depressing the shrader valve to allow the system to charge thru the low side..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

mk378 on Mon June 08, 2009 9:50 AM User is offline

Nothing should be getting cold before the expansion valve. The fact that you found no refrigerant in the system, but also no apparent leak, suggests that someone else has been tinkering with it.

540itouring on Mon June 08, 2009 1:30 PM User is offline

I can confirm that no other person has touched the system since it last worked. If i had put a hiher pressure of ofn when testing for a leak could this damage of cause any other faults other than blowing open the evaporator etc of which is still ok as it holds pressure ok. I am sure the low valve must have pressed the shrader open or i would not of had a low vacuume reading on the low guage when i opened the hihg valve during vacuume stage ?


If the low side valve did not open this would not explain why the compressor runs all the time with a little gas in the system and the output side of the compressor is very hot. The pipe is also hot up to the condenser but the condenser is cold. The pipe upto the evaporator goets clod so i was thinking a blockage between the input to the condenser and output of the filter dryer ? Could a newish filter dryer be blocked so soon ? Would a blockage on the output side of the compressor cause the input side not to suck in any gas ?


Lots of questions but the system is not that complex just not easy to get at. What do you think i should do next as far as tests go. Thanks for all your help

Chick on Mon June 08, 2009 2:49 PM User is offlineView users profile

First off, the system needs to be full to test it, you got some in the high side, but nothing in the low side, so you're not full. Fix the low side coupler problem, get the full charge in there and then test the AC.. As far as testing the drier, the refrigerant lines should be the same temp in and out.. If warm going in and cool coming out, the drier is plugged.. But again, you need the full charge in the system..Hope this helps..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

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