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Cooling system pressure test by 85fieroguy
Started on: 10-17-2016 10:22 PM
Replies: 10 (199 views)
Last post by: Patrick on 10-22-2016 03:32 PM
85fieroguy
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Report this Post10-17-2016 10:22 PM Click Here to See the Profile for 85fieroguySend a Private Message to 85fieroguyEdit/Delete MessageReply w/QuoteDirect Link to This Post
Will a cooling system pressure test show if the water pump is working or if the seal is leaking??. Have a small leak in the right inside rear floor area and cannot find the source.
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viperine
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Report this Post10-17-2016 10:28 PM Click Here to See the Profile for viperineClick Here to Email viperineSend a Private Message to viperineEdit/Delete MessageReply w/QuoteDirect Link to This Post
Right inside rear floor area? So you have coolant behind the passenger seat? I feel awfully silly asking, but it's how it sounds. If this is in fact correct, the heater core is leaking and coolant is pooling behind the seat by means of driving or parking uphill...
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85fieroguy
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Report this Post10-19-2016 01:35 PM Click Here to See the Profile for 85fieroguySend a Private Message to 85fieroguyEdit/Delete MessageReply w/QuoteDirect Link to This Post
..eh, I meant the GARAGE FLOOR...inside to the left of the right rear tire.
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tebailey
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Report this Post10-19-2016 01:54 PM Click Here to See the Profile for tebaileyClick Here to Email tebaileySend a Private Message to tebaileyEdit/Delete MessageReply w/QuoteDirect Link to This Post
Won't tell you if the water pump is working, but will tell you if it's leaking.
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theogre
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Report this Post10-19-2016 02:04 PM Click Here to See the Profile for theogreClick Here to visit theogre's HomePageSend a Private Message to theogreEdit/Delete MessageReply w/QuoteDirect Link to This Post
Pressure Test can show leaks anywhere but not WP function.

Problem is most test sets won't fit Fiero because rad cap area is too small to fit the adapters w/o hood removed.

You can try drilling out Tstat cap rivet and replace w/ bolt in tire valve assemble.
Can Pressurize the system until rad cap think the car is at "boils over" but likely leak will show up before that.

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Gwhite18
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Report this Post10-20-2016 12:19 AM Click Here to See the Profile for Gwhite18Click Here to Email Gwhite18Send a Private Message to Gwhite18Edit/Delete MessageReply w/QuoteDirect Link to This Post
Why didn't I think of that. So much more cost effective than a 200.00 test kit.
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andreww
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Report this Post10-20-2016 08:25 AM Click Here to See the Profile for andrewwSend a Private Message to andrewwEdit/Delete MessageReply w/QuoteDirect Link to This Post
Why would you do a pressure test anyway? You already know its leaking!
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85fieroguy
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Report this Post10-20-2016 08:35 AM Click Here to See the Profile for 85fieroguySend a Private Message to 85fieroguyEdit/Delete MessageReply w/QuoteDirect Link to This Post
Ah, Andrew... LOL...if we knew it was the water pump leaking , why would we post the problem. Nothing seems to be coming out the " weep hole"
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theogre
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Report this Post10-20-2016 12:20 PM Click Here to See the Profile for theogreClick Here to visit theogre's HomePageSend a Private Message to theogreEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Gwhite18:
Why didn't I think of that. So much more cost effective than a 200.00 test kit.
You can get them thru Loaner Tools from many Auto Parts Stores but as said above... they won't fit w/ hood on.

Also... Some stores sell a "store brand" or other Tstat cap all made by same company.
I had trouble using them. May look the same but won't fit my 87 duke. Get a Stant cap solves this.
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jscott1
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Report this Post10-22-2016 03:26 PM Click Here to See the Profile for jscott1Send a Private Message to jscott1Edit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by theogre:

Pressure Test can show leaks anywhere but not WP function.

Problem is most test sets won't fit Fiero because rad cap area is too small to fit the adapters w/o hood removed.

You can try drilling out Tstat cap rivet and replace w/ bolt in tire valve assemble.
Can Pressurize the system until rad cap think the car is at "boils over" but likely leak will show up before that.


Great idea....someone should sell these.

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Patrick
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Report this Post10-22-2016 03:32 PM Click Here to See the Profile for PatrickClick Here to Email PatrickSend a Private Message to PatrickEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by 85fieroguy:

LOL...if we knew it was the water pump leaking , why would we post the problem. Nothing seems to be coming out the "weep hole".


That's what I thought a couple years ago as well, but eventually discovered it was... Where the heck is this coolant leaking from?

[This message has been edited by Patrick (edited 10-22-2016).]

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