Overheating + HVAC not working - Turbo Dodge Forums : Turbo Dodge Forum for Turbo Mopars, Shelbys, Dodge Daytona, Dodge SRT-4, Chrysler PT Cruiser, Omni and more!
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post #1 of 21 Old 07-13-2017, 11:53 AM Thread Starter
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Overheating + HVAC not working

1985 Laser, 2.2 turbo 1.

Car was fine before I had the headgasket replaced.

Temperature is getting way too hot in stop and go traffic now. Also the HVAC isn't working- Blows cold air out of the foot and defroster vent no matter what button is pressed.

I replaced the thermostat with the Stant 'superstat' and opened the plug on top of the water box when refilling the coolant, should have no air pockets.

Was something hooked up wrong when the car was put back together? What vacuum lines and coolant lines should I check?

Last edited by cm108kgh; 07-13-2017 at 07:19 PM.
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post #2 of 21 Old 07-13-2017, 12:49 PM
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Re: Overheating + HVAC not working

Sounds like radiator fan is not working and probably a vacuum line on the a/c
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post #3 of 21 Old 07-13-2017, 12:54 PM Thread Starter
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Re: Overheating + HVAC not working

Radiator fan works.

I checked out all the hoses last weekend (removed the air intake to check underneath) and they're all hooked up, not sure if they're hooked up correctly though? Is there a picture or diagram anywhere?
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post #4 of 21 Old 07-13-2017, 05:47 PM
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Re: Overheating + HVAC not working

Why was the headgasket replaced?

Nothing from defrost?
Always cold air?
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post #5 of 21 Old 07-13-2017, 06:20 PM
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Re: Overheating + HVAC not working

If you had a mechanic replace the head gasket take it back to him or her to have it diagnosed under their warranty. Even if they didn't specifically give you a warranty in writing a good mechanic would take care of the problem rather than have their name bad mouthed all over town.

Let them fix it before you start trying to correct the problems. You don't want to give the mechanic any reason to say "oh you worked on it so the warranty is void".
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post #6 of 21 Old 07-13-2017, 07:24 PM Thread Starter
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Re: Overheating + HVAC not working

Quote:
Originally Posted by NAJ View Post
Why was the headgasket replaced?

Nothing from defrost?
Always cold air?
The car was smoking a bit. CA smog test didn't like that.

Oops, I meant to say air is blowing from the defroster and foot vents. Air is the same temp no matter where the hot/cold slider is.

Quote:
Originally Posted by Meek View Post
If you had a mechanic replace the head gasket take it back to him or her to have it diagnosed under their warranty.
I get your point but a simple fix like swapping a hose around is much less of a hassle than taking it back to the shop.
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post #7 of 21 Old 07-13-2017, 08:42 PM
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Re: Overheating + HVAC not working

Here are ALL of the possible causes...

As far as the HVAC...
1)Defrost is default.
a)When the vacuum source to the HVAC is lost the system defaults to defrost for safety reasons.
As already stated you need to check the vacuum source into the passenger compartment from underhood.
2)Cold air is going to be caused by...
a)Air in system preventing coolant flow through the heater core
b)Faulty heater control valve
c)Restricted heater core
d)Temperature control cable not connected
e)Blend door broken

As far as the Overheating...
1)Head is not sealed correctly
a)Head is warped
b)Head is/was not torqued properly or stretched headbolts were re-used.
2)Faulty Water Pump
3)Faulty Thermostat.
4)Restricted Radiator
5)Collapsed Radiator Hose
6)Air In System
7)Water Jacket Restricted
8)Cooling Fan Inop
9)Front Lower Air Deflector Missing

HVAC VACUUM SOURCE
(Your car will be similar, may not be exact)
The rubber hose runs to a small polyethylene hose that runs through the firewall to the HVAC control unit.


PROPER DRAIN AND FILL PROCEDURE



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post #8 of 21 Old 07-13-2017, 11:25 PM Thread Starter
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Re: Overheating + HVAC not working

Everything is connected at the brake booster. Lines running to the firewall look OK.

I'm trying to make sense of this:


This is how it's all hooked up:


Is this right? None of these hoses are getting warm even after the car is driven for a while.
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post #9 of 21 Old 07-14-2017, 06:22 AM
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Re: Overheating + HVAC not working

In your first pic everything may be hooked up but is there vacuum getting through the lines to the HVAC control unit?
1)Vacuum Line Kinked/Collapsed/Restricted
2)Faulty or Improperly Installed Check Valve

In your second illustration, cold hoses into the heater core...
1)Air in System
2)Thermostat Stuck Open
3)Coolant Circulation Issue
a)Heater Hoses Connected Backwards
b)Heater Hoses Kinked/Collapsed/Restricted
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post #10 of 21 Old 07-14-2017, 12:26 PM Thread Starter
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Re: Overheating + HVAC not working

Reading that the water pump direction is different on older and newer cars. Pump was replaced with the headgasket.

Could that have something to do with this?
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post #11 of 21 Old 07-14-2017, 03:43 PM
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Re: Overheating + HVAC not working

I think the easiest way to tell is-> the older pump will have the belt riding on a grooved surface pulley. The 89 & up pumps have the belt riding a smooth surfaced pulley. A mismatch could cause over heating. The hvac issue is most likely a leak, crack, rub through somewhere on that vacuum line that heads into the cabin.
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post #12 of 21 Old 07-14-2017, 05:57 PM
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Re: Overheating + HVAC not working

Quote:
Originally Posted by cm108kgh View Post
Reading that the water pump direction is different on older and newer cars. Pump was replaced with the headgasket.

Could that have something to do with this?
Yes they rotated in the opposite direction.
Unless you have a part # and brand that he installed....
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post #13 of 21 Old 07-17-2017, 07:00 AM
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Re: Overheating + HVAC not working

Water pump would be hard to tell if he just swapped pulleys.
I think I've seen a picture here of the two pumps side by side and the differences.


My guess is like 99% of the non Dodge mechanics that work on these cars, the timing is not set properly.
Advanced ?
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post #14 of 21 Old 07-17-2017, 01:18 PM Thread Starter
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Re: Overheating + HVAC not working

From what I can tell the water pump housing and pulley were re-used. The new-style pump won't bolt up to the old-style housing, correct?

I'm replacing the alternator and might take the pump off too just to inspect it. I've been told never to assume new parts aren't defective.
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post #15 of 21 Old 07-17-2017, 01:46 PM
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Re: Overheating + HVAC not working

Just drop the vehicle off at the mechanics shop tonight after work. Then pick it up in a day or two. Let them find out if they messed up the job. Maybe the head gasket didn't seal.

What is more convenient dropping the car off at the shop to have the mechanic repair his mistake or you having to pay to have the job re-done because you waited too long to bring it back for repairs?

Remember they have all the test gear to diagnose the problem and the tools to fix it.


Look at this lucky guy's vehicle story.

I call the shop that did the work. They tell me to bring it all in and they would make it right. So I did. Turns out, long story short, they put the head gasket on backwards (yea, they fit) and actually covered up a water passage. Once they got that all back right, put in a Toyota thermostat, burped the cooling system (easy to do this time) all has been well since. So, you may very well have a covered cooling passage. This could also lead to hot spots in the head and cause a big problem later. I hate to tell you this, but you may have to pull the heads again. Use a new set of gaskets and new head bolts. Both are a one time use item. Believe me, I know, and so does the shop that did the work. Credit to the shop though, they made it RIGHT for me. Yea, maybe they goofed, but they did not charge me one cent more to totally redo everything. Later.
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