2005 Grand Caravan front expansion valve bad?

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2005 Grand Caravan front expansion valve bad?

Postby truart64 » Tue Jul 19, 2016 8:32 pm

Hello Experts,

My minivan's engine seems to misfire irregularly but more often when it is hot. I had a mechanic checked and he said it was NOT misfiring (checked ignition wires/cylinders) but it was the ac expansion valve in the front. It appears to be closing/sticking and the pressure was too high. He evacuated and filled to the right amount of 134. Symptoms got better, but it still happens, especially when it is hot outside.

He said it would be about $120 labor + $30 parts to evacuate, replace expansion valve, and refill.

Question: Does a sticking ac expansion valve in the front cause this behavior/symptom?

Thanks!
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Re: 2005 Grand Caravan front expansion valve bad?

Postby GM Tech » Tue Jul 19, 2016 9:19 pm

Never heard that one before....and I've been around quite awhile....
'95 Chevy 3500 454 Dually 142,000 miles
'94 Chevy Astro Van 358,000 miles!
'86 Buick Park Ave 192,000 miles
'86 GMC S-15 Pick-up 150,000 miles
'92 Chevy Lumina Van - 265,000 miles- given to me to see how far it can go! all above are white!
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Re: 2005 Grand Caravan front expansion valve bad?

Postby Tom Greenleaf » Wed Jul 20, 2016 12:19 am

It does list a FRONT expansion valve on a dual air system for this. Not strong in Chrysler products and info isn't always correct available to me.

Copied from an auto parts retailer..........

Image


Everco A/C Expansion Valve



Price: $35.99

Mail-in Rebate - View Now
Part Number: 38002
Warranty: 1 YR
Notes: Front unit


Not very sure but should be able to simply run front only and tell if there is a failure of front only or not. Feel lines for temps or use an IR thermometer,

T

(edit in)

Hey - if this vehicle isn't running properly as described "misfiring" why is A/C involved? Get code readings which should be able to put out a code # indicating which cylinder or multiple misfires. Do keep in mind codes tell you the circuit with a problem not what the problem is or a part to replace.......
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Re: 2005 Grand Caravan front expansion valve bad?

Postby cornbinder89 » Fri Jul 22, 2016 2:36 pm

Easy to test. Next time it happens, turn off the AC or unplug the compressor clutch, if the problem goes away than there is something happening when the AC is on.
Could be as simple as too slow an idle for the compressor load,
For the Tx valve to cause a problem, the only thing I can see is either stuck closed and the high side is too high (I which case you would be looking for safety valve or blow off opening) or over charged and stuck open, where you could have liquid refrigerant "slogging" the compressor.
Both are unlikely.
Far more likely is you are feeling viberation and thinking it is a "miss".
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