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1998 MPV 4X4
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1Badbaby
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Joined: 15 Oct 2014
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PostPosted: Wed Oct 15, 2014 7:04 pm    Post subject: 1998 MPV 4X4 Reply with quote

The heater has been off for several months, but now it's time to do it's job. No heat coming out of the vents. I had to repair the hoses under the driver's seat this summer because of a leak. Temp guage is normal, but no heat front or rear.

Any suggestions ??
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Cybersombosis
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Joined: 03 Oct 2005
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Location: Victoria, BC, CA

PostPosted: Wed Oct 15, 2014 7:05 pm    Post subject: Re: 1998 MPV 4X4 Reply with quote

Flush the core?

Doug

97' MPV All Sport 4x4
Black Widow 1600 Alarm, Uhaul class 3 tow hitch, K&N air filter, Bi Xenon HID retrofit.
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Manitoba MPV
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Joined: 11 Nov 2004
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Location: Winnipeg, MB, CA

PostPosted: Thu Oct 16, 2014 5:14 pm    Post subject: Re: 1998 MPV 4X4 Reply with quote

I flushed the heater cores a few weeks ago, as follows:

1. Remove the short 90-degree hose to the main heater core, and install a long (8' or so) length of generic heater hose such that it leaves the engine bay. (Can't remember what size - 5/8" or 3/4" IIRC.)

2. Trace the other heater hose plumbing to near the front of the engine on the driver's side. Pull the hose there, and add a 2nd length of generic heater hose long enough to leave the engine bay.

3. Install a Prestone or equivalent flush & fill kit fitting that allows a standard garden hose to be attached. (You'll do both hoses, and I don't think it matters which one you start with.)

4. Assuming you have a rear heater, use clamps to isolate the heaters in turn.

5. Turn on the water and blast out the junk from the core(s). You may want to catch the expelled water to see what sort of junk was in the core(s).

I did a bit extra at this point; I suspended both hoses so they were higher than the heater core, and filled one of them with vinegar. I left everything like this overnight, and then let blasted everything out with water the next day.

Was the vinegar soak necessary? I don't know, but it's done now.

Manitoba MPV

'82 GLC 1.5 5-speed ('82 - '95); '79 GLC Sport 1.4 5-speed ('87 - '89); '85 626 2.0 5-speed ('97 - '05); '90 MPV 2WD 2.6 5-speed ('96 - '01); '95 Bawngo GL Super 9 pass 2.0 5-speed ('03 - '04); '97 AllSport 2WD 3.0 auto ('01 - ?); '01 Protege 1.6 5-speed ('05 - '13); '09 Mazda 5 GT 5-speed ('13 - ?)
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DazSpaz
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PostPosted: Sun Jan 06, 2019 5:54 am    Post subject: Re: 1998 MPV 4X4 Reply with quote

Any chance you can post a pic of the location of these sites you used to connect to flush? These are both on the firewall in the engine bay rear of the dash correct?
I have a 97 all sport 4x4 as well and a minuscule amount of heat from all dash settings and hope a flush is what's necessary to get it working.
Cheers.

DazSpaz
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mpvclub65170
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Joined: 31 May 2014
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Location: Austin, Texas, United States

PostPosted: Sun Jan 06, 2019 12:02 pm    Post subject: Re: 1998 MPV 4X4 Reply with quote

Here are some pics of when I flushed the heater core last year. You can connect your flush hoses to the metal heater core pipes at the firewall or follow the lines forward and connect the flush hoses to the metal lines on either side of the block, which is what I did. Pics below. Also attached is a pic of the debris that came out of the core. It doesn't look like that small amount of debris would affect anything but it made a big difference in the heat.
Ed





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20180103_174904.jpg - File downloaded or viewed 46 time(s)


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20180103_172523.jpg - File downloaded or viewed 46 time(s)


20180103_174910.jpg

20180103_174910.jpg - File downloaded or viewed 46 time(s)

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DazSpaz
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PostPosted: Sun Jan 06, 2019 12:09 pm    Post subject: Re: 1998 MPV 4X4 Reply with quote

Ed. Thanks for the quick reply. Does the flush you did include the rear heater core or is it just the front heater core? The previous owner disconnected and bypassed the rear heater core and I'm wondering if the routing is still correct and that a clogged front core is my problem or if they did something wrong and caused a loop instead of the proper flow direction.

Thanks ahead. Again.
Daz

DazSpaz
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mpvclub65170
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PostPosted: Sun Jan 06, 2019 12:22 pm    Post subject: Re: 1998 MPV 4X4 Reply with quote

Just the front. My MPV didn't come with the rear heater core option, but here is the service manual pic of the hose routing for MPVs with the rear heat option.
Ed





Screen Shot 2019-01-06 at 11.17.34 AM.jpg

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Screen Shot 2019-01-06 at 11.14.34 AM.jpg - 133.53 KB
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DazSpaz
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PostPosted: Sun Jan 06, 2019 3:35 pm    Post subject: Re: 1998 MPV 4X4 Reply with quote

Very cool. Thank you for that diagram. Exactly what I was looking for.
Cheers

DazSpaz
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DazSpaz
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PostPosted: Wed Jan 09, 2019 11:51 am    Post subject: Re: 1998 MPV 4X4 Reply with quote

So.
Discovered that the loop in the ine to the rear heater was not creating enough resistance in the flow with the rear heater core bypassed, to force much fluid through the tee to the front heater core. Front heater core was loaded with garbage that has settled in there because of the low flow. I've now cut and capped the rear lines and flushed the hell outta the front core. Test run with just water in the cooling system saw warm air coming from the cab vents within 3 minutes. Toasty after a 10 minute warm up. Since coolant transfers heat better than water I suspect I will see even better results when I fill up the system with the right mix of coolant and distilled. Cheers guys.
Dazspaz

DazSpaz
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