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post #1 of (permalink) Old 11-09-2004, 09:14 AM Thread Starter
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Indecisive coolant system

[warning: I'm going to go into a lot of detail here, so maybe one of you can figure out what is going on]

I've been having problems with my truck getting hot periodically. It must have a pinhole somewhere that allows it to leak very slowly. Every couple of months I have to fill the radiator up again with water.

I just did this a couple of weeks ago, and while I was filling it up, i'd start it up and let it get hot, then turn it off and let it cool off and then add more water. The wierd thing is that I had at least 3/4 full radiator and it would still go up to the L in NORMAL then after hanging there for quite a while, I could hear water rushing into the heater core and the temp dropped immediately. I thought maybe it was an air bubble or something, so I didn't think anything of it.

Well, this morning, I let my truck warm up and headed the 30miles to work. As I got into town, I noticed that my heater wasn't as hot as I thought it should be. I then noticed that my temp gauge would go up and down, inversely proportional to how much gas I was giving it. When I was braking, it would hit the AL, and when I was just driving it would hit the O (where it usually rests).

Can someone give me any guesses on what might be going on here? Could it be the water pump going out, or maybe just some crud in the water lines? Thanks in advance!
matteorr is offline  
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post #2 of (permalink) Old 11-09-2004, 04:42 PM
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Re: Indecisive coolant system

Try replacing the thermostat. Also make sure your inlet and outlet lines has that spring in the hose to keep it from collapsing. That's all I can think of right now.
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post #3 of (permalink) Old 11-09-2004, 09:51 PM
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Re: Indecisive coolant system

Mine did the same thing-replaced the water pump and all hoses and thermostat and everything is bueno now.
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post #4 of (permalink) Old 11-10-2004, 03:25 AM
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Re: Indecisive coolant system

I'd flush the system till you get nice clean water comming out of it. Properly done this can take 1hr plus! but is well worth it in the long run.
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post #5 of (permalink) Old 11-12-2004, 06:14 PM
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Re: Indecisive coolant system

well since you are loosing a little coolant, i would start by crawling underneath with a powerful maglite with fresh duracells, and check for signs of coolant or rust stains around:

1. the evaporator/heater core drain pipe
2. the sides of the block for leaking frost plugs
3. under the exhaust manifolds for a leaking ... or cracked... (wont mention [img]images/graemlins/censor.gif[/img])
4. under the timing cover for eroded coolant passages on the sides of it or gasket failure and also the weep hole on the waterpump.
5. then go up on top and check around the thermostat housing and check all hoses or tee`s including the ones to the throttlebody.

If no leaks found, dont rule out a bad fan clutch or sticking thermostat.

hope this helps....
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post #6 of (permalink) Old 11-12-2004, 08:28 PM
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Re: Indecisive coolant system

Somebody at the other forum just suggested something I'll pass on for comment, that might help you.

He suggested his version of a reverse flush for the heater core was to swap the hoses on the nipples at the firewall.

I thought that wasn't a bad idea, is it ?

Now my helpful hint is in, THREAD HIJACK ! (somewhat related)

Check these out !

Man could I have used these over the last 25+ years for some of my beater breakdowns !

Sixlitre is offline  
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