NO HEAT

[zr1343]

I was reading some of the other posts and I believe I have the dredded air bubble in the system. I drove her in 30 to 35 degree weather and I had little to no heat. Fans work , dampers move, engine temps appear to be OK, and the heater controls are not throwing codes as per the manual. I have faintly warm air when I first turn the system on but it quickly cools to ambient when moving. The inlet and outlet lines to the heater core feel hot.
How do I get the air out? I saw a reference to ZR1 Specialist sight but I can't seem to open the article. I have seen something in the past about jacking up the right side of the car when filling. Does anyone know if jacking the car up on the right side while running will clear the bubble on a filled system or do I need to do a drain and refill?

[HAWAIIZR-1]

I was reading some of the other posts and I believe I have the dredded air bubble in the system. I drove her in 30 to 35 degree weather and I had little to no heat. Fans work , dampers move, engine temps appear to be OK, and the heater controls are not throwing codes as per the manual. I have faintly warm air when I first turn the system on but it quickly cools to ambient when moving. The inlet and outlet lines to the heater core feel hot.
How do I get the air out? I saw a reference to ZR1 Specialist sight but I can't seem to open the article. I have seen something in the past about jacking up the right side of the car when filling. Does anyone know if jacking the car up on the right side while running will clear the bubble on a filled system or do I need to do a drain and refill?

Marc's site seems to be having problem with the articles. I'll send you the written instructions with pictures to your email.

[zr1343]

Marc's site seems to be having problem with the articles. I'll send you the written instructions with pictures to your email.
Thats exactly what I was looking for. Thanks.

[jonszr1]

after a couple of heat cycles your system should cycle out the air . the only time i have ever had a problem is when i have had some kinda leak in the system .after the car cooled down and you took off the cap was the level all the way up????/ if not you might pressure test the system and see if it holds pressure .

[gbrtng]

You need a good "radiator" cap for the heat cycles to fill the system properly - and keep the white tank supplied with coolant.

[jonszr1]

thanx for the rad cap addition i forgot about that one :thumbsup:

[zr1343]

I think there are only three articles that are not functioning on Marc's web site .....one is the coolant installation.

So...did the original Marc Haibeck method of coolant installation work for you :icon_ques

What are the main points of Marc's method of replacing coolant :happy1:

The reason I am asking is that maybe Marc is altering those methods.

It seems I have a plugged heater core. Hot line in and cool or slightly warm on the short u tube out to tank. I tried parking the car on an extreme angle with the passenger side raised very high. No bubbles during warm up with cap removed.
I believe she is full and no bubbles are in it. any one had any luck back flushing heater cores? It looks like I have a project.

[jonszr1]

i have to replace the heater core on my 90, its leakin . looks like you have to remove everything in the dash to get it out .? anyone done this project ?and have any help on what probs crop up ??????

[Jeffvette]

Any one had any luck back flushing heater cores? It looks like I have a project.


You can flush it, you need to cycle water through the inlet and outlet back and forth. Don't get your hopes up on that helping. Also keep the pressure low as the units were not designed to hold a lot.

[phrogs]

Its a job from hell but it can be done.
The heater core sits inside of a black plastic shell and you will have to remove the dash to get to it.

[jonszr1]

i will never figure out why they make it soooooo hard to get to :mad:

[jonszr1]

maybe we ought to find a couple of escorts for the engineers so they will be happy when they design stuff .seems like they are into making things impossible

[jonszr1]

i was on marks site last night and noticed an article on the heater core inlet line becomming partially clogged i am wondering if you dont have that same problem .just a thought